SRC TR

- 12

- 037

HPV2 TEST RULE DATA ADEQUACY REVIEW : MAY 2012 UPDATE ( FINAL )

Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CASRN 68479

- 98

- 1

Prepared by:

Jennifer Rayner

, William L. Richards, Teresa Manyin

, and David Wohlers

Chemical, Biological and Environmental Center SRC, Inc.
7502 Round Pond Road North Syracuse, NY 13212

Contract No. EP

- W

- 09

- 027
Task FG007.2.009.001

Submitted to:

OCSPP/OPPT/RAD (7403M)
U.S. Environmental Protection Agency 1200 Pennsylvania Avenue

Washington, D.C. 20460

Debra Milligan, Project Officer Meena Sonawane, Work Assignment Manager David Brooks, Alternate Work Assignment Manager

May 4

, 2012Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

i TABLE OF CONTENTS

A. INTRODUCTION

................................ ................................ ................................ .................... 1

B

. SUMMARY OF DATA ADEQUACY FOR TESTING REQUIRED BY TEST RULE

........ 1

C. DATA FOR SIDS ENDPOINTS

................................ ................................ .............................. 2

C

- 1. Acute Toxicity to Fish: Test Requirement (C1) under Final HPV2 Test Rule Dated January 7, 2011

................................ ................................ ................................ ........................... 2

C

- 2. Acute Toxicity to Daphnia : Test Requirement (C1) under Final HPV2 Test Rule Dated January 7, 2011

................................ ................................ ................................ ........................... 3

C

- 3. Toxicity to Plants (Algae): Test Requirement (C1) under Final HPV2 Test Rule Dated January 7, 2011

................................ ................................ ................................ ........................... 4

C

- 4. Acute Toxicity

................................ ................................ ................................ .................... 8

C

- 5. Repeat ed

- Dose Toxicity: Test Requirement (F1) under Final HPV2 Test Rule Dated January 7, 2011

................................ ................................ ................................ ......................... 14

C

- 6. Genetic Toxicity

– Gene Mutation : Test Requirement (E1) under Final HPV2 Test Rule Dated January 7, 2011

................................ ................................ ................................ ............... 33

C

- 7. Genetic Toxicity

– Chromosomal Aberrations: Tes t Requirement (E2) under Final HPV2 Test Rule Dated January 7, 2011

................................ ................................ ................. 111

C

- 8. Reproductive Toxicity: Test Requirement (F1) under Final HPV2 Test Rule Dated January 7, 2011

................................ ................................ ................................ ....................... 121

C

- 9. Developmental Toxicity: Test Requirement (F1) under Final HPV2 Test Rule Date d January 7, 2011

................................ ................................ ................................ ....................... 122

D. SUPPLEMENTAL DATA (NON

- SIDS ENDPOINTS)

................................ ...................... 123

D

- 1. Genetic Toxicity

– Other

................................ ................................ ................................ 123

D

- 2. Carcinogenicity

................................ ................................ ................................ .............. 150

D

- 3. Skin Irritation

................................ ................................ ................................ ................. 164

D

- 4. Eye Irritation

................................ ................................ ................................ .................. 166

D

- 5. Skin Sensitization

................................ ................................ ................................ ........... 168

D

- 6. Toxicokinetic Studies

................................ ................................ ................................ ..... 170

E. DATA ADEQUACY SUMMARY TABLE

................................ ................................ ......... 179Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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1 A. INTRODUCTION

This document evaluates a submission from Albemarle Corporation and Lonza (dated March 1, 2012) received by EPA in response to the final test rule, “Testing of Certain High Production Volume Chemicals; Second Group of Chemicals” (76 FR 1067, January 7, 2011; referred to
here in as HPV2) for benzenediamine, ar, ar

- diethyl

- ar

- methyl

- (CASRN 68479

- 98

- 1 ) . In this submission, Albemarle Corporation and Lonza supplied data for genetic toxicity tests required by the HPV2 test rule : chromosomal aberrations and mammalian cell mutation

. These newly submitted studies are evaluated for adequacy herein. This rep ort also contains data , evaluated previously by EPA, that were derived from a prior submission by Albemarle and Lonza (received by EPA on May 6, 2011) and, therefore, provides an update of the data adequacy assessment previously compiled for CASRN 68479

- 98

- 1 in August 2011

.

Data available for SIDS toxicity endpoints are evaluated for adequacy in Section C. Using standard testing guidelines and professional judgment as guides, each study was assigned a Klimisch reliability code. Additional data for non

- SIDS toxicity endpoints (“supplemental” data) are reviewed in Section D. A summary of the adequacy assessment for each SIDS endpoint is provided on the last page of this document (Section E).

B

. SUMMARY OF DATA ADEQUACY FOR TESTING REQUIRED BY TEST RULE

The previous data adequacy assessment (dated August 2011) for CASRN 68479

- 98

- 1 identified the following data gaps for endpoints required by the HPV2 test rule: acute toxicity to fish, acute toxicity to Daphnia , chromosomal aberrations, and reproductive/developmental toxicity. T he

t est rule requirement for chromosomal aberrations (E2) may be satisfied by conducting one of the following tests: (1) In vitro Mammalian Chromosome Aberration Test (40 CFR 799.9537), (2) Mammalian Bone Marrow Chrom osomal Aberration Test ( in vivo in rodents: mouse [ preferred species ] , rat, or Chine se hamster; 40 CFR 799.9538), or (3) Mammalian Erythrocyte
Micronucleus Test ( sampled in bone marrow ; in vivo in rodents: mouse [ preferred species ] , rat, or Chine se hamster; 40 CFR 799.9539)

.

Genotoxicity data supplied on March 1, 2012 by Albemarle Corporation and Lonza were adequate to satisfy the chromosomal aberrations ( E2 ) test requirement promulgated in the final
HPV2 test rule. The se newly submitted dat a included a chromosomal aberration study in human lymphocytes (see p. 111 of this report ; Study 1 in section C

- 7 ) and a bone marrow micronucleus
test in mice (see p. 115 of this report ; Study 2 in section C

- 7 )

. No additional studies need to be
conducted for the E2 endpoint. Additional genotoxicity data

, included in the March 1, 2012 submission from Albemarle Corporation and Lonza

, consisted of an in vitro gene mutation test in
mammalian cells

, which provided f urther support for the gene mutation endpoint (see p. 72 of this report ; Study 1 2 in section C

- 6 )

.

The following d ata gaps remain for test rule

- required endpoints: acute toxicity to fish, acute toxicity to Daphnia , and reproductive/developmental toxicity

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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2 C. DATA FOR SIDS ENDPOINTS

C

- 1

. Acute Toxicity to Fish : Test Requirement (C1) under Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Not adequate

No studies were submitted for this endpoint.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

3 C

- 2

. Acute Toxicity to Daphnia : Test Requirement (C1) under Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Not adequate

No studies were submitted for this endpoint.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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4 C

- 3 . Toxicity to Plants (Algae): Test Requirement (C1) under Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Adequate

Study 1: Toxicity to Desmodesmus subspicatus (Caspers, 2010)

Title: Alga, growth inhibition test with DETDA (Diethyltoluylendiamin

- 80).

This study is: Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1 ; Synonym:
Die thyltoluenediamine (DETDA)

Remarks: Physical state: clear, light

- colored liquid; Test item: DETDA (Diethyltoluylendiamin

- 80); Chemical name: Diethylmethylbenzoldiamine; CAS Number:
68479

- 98

- 1); Purity: 97.7%; Composition: 2,4

- DETDA (75

- 81%), 2,6

- DETDA ( 18

- 24%), 2,4,6

- TEMPDA (0

- 1%)

METHOD

Method/guideline followed: OECD Guideline 201 (2006); EU method C.3 (2009)

Test type: Toxicity test to freshwater algae

GLP compliant?: Yes

Year study was performed: 2010

Test species: Freshwater green algae ( Desmodesmus subspicatus , formerly Scenedesmus subspicatus )

Analytical monitoring: Yes

Exposure duration: 72 hours

Concentrations tested: Nominal: 0.1, 0.32, 1.0, 3.2, 10, 32 and 100 mg/L Measured (GC with FID detector) concentrations ranged from 95 .3 to 102.2% of nominal values at initiation and 83.1
to 95.5% of nominal at 72 hours.

Test method/conditions remarks: Endpoints were growth rate and biomass. Exponentially growing algae cells were exposed for 72 hours to a range of concentrations; nom inally 0.1, 0.32, 1.0, 3.2, 10, 32, and 100 mg/L of DETDA dissolved in dilution water. Measured (GC with FID detector) concentrations ranged from 95.3 to 102.2% of nominal values at initiation and 83.1 toFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

5 95.5% of nominal at 72 hours. The cell densities were measured at 24

- hour intervals. Inhibition of algal population was measured as reduction in growth rate relative to control cultures. The
72

- hour EC 10 and EC 50 were calculated by probit analysis. All calculations were carried out using the statisti cs program ToxRatPro Version 2.10 (released 2010

- 02

- 20). For the calculations all algae counts were divided by a factor of 10,000. NOEC and LOEC were determined by a multisampling comparison.

During the test a temperature range of 21

- 24°C was maintained in the test vessels. The pH was measured at the beginning of the test and after 72 hours of exposure. The maintenance of the test item concentrations was proved by analytical measurements. In order to avoid an impairment of the test system, an addition al replicate was used for analysis and pH measurement at the beginning of the test. Chemical analysis and pH measurements at the end of the test were performed using replicate I of the test concentrations and control vessels, respectively.

Test Species Name: Desmodesmus subspicatus Strain No. 86.81 SAG Source: Strain of the test species obtained from ‘The Collection of Algal Cultures’ of the Institute of Plant Physiology at the University of Gottingen (Germany). Maintenance and Acclimatization: Exponent ially growing stock cultures were maintained in the test facility under constant temperature conditions (21

- 24°C with a maximum fluctuation of +/

- 2°C) at a light intensity in the range 60

– 120 μE. x m

- 2 x

- 1 (measured in the range 400 to 700 nm using a sp herical flux meter). The growth medium (according to BRINGMANN & KUHN (1977) was renewed once a week. Cell density measurements were made using a microcell counter, Sysmex F300, Digitana. Preparation of pre

- cultures: Pre

- cultures were set up three days b efore the start of a test. They were grown under identical exposure conditions as the stock cultures, except from the use of a different growth medium. Test cultures: The algal inocula for a test were taken from an exponentially growing pre

- culture
and w ere mixed with the growth medium to make up to a final density of about 5000 cells per
milliliter in the test medium.

Growth medium and dilution water Growth medium (OECD medium of OECD TG 201) was used for the growth of the algae in the pre cultures and the preparation of stock and test solutions of the test item.

Pre

- treatment of test item and preparation of test item concentrations A stock solution was prepared to give the desired series of test concentrations. 100.4 mg of the test item were added to 1 litre of dilution water and treated for 60 seconds at 8000 rpm with an ultra turrax and afterwards stirred for 24 h on a magnetic sti rrer. The pH was measured to be 8.0.

To produce the different test item concentrations appropriate amounts of the stock solution were diluted with dilution water to a volume of 100 mL. Afterwards 0.724 mL of the algal inoculum were added to each replicat e resulting in a final cell density of 5000 cells/mL. For each test item concentration and the control 3 replicates were prepared.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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6 Exposure Conditions The test vessels were 300 mL Erlenmeyer flasks, and the culturing apparatus included a light
chamber in which a temperature in the range 21°C to 24°C was maintained at +/

- 2°C, and continuous uniform illumination was provided in the spectral range 400 to 700 nm. Temperature was measured and recorded daily in a water filled flask which was incubated under th e same conditions as the test flasks. At the average of the test solutions, a light intensity in the range 60 to 120 μE. x m

- 2 x s

- 1, or an equivalent range of 4000 to 8000 lx, was used. Light intensity was checked before the start of the study.

Cell den sities were measured in a microcell counter by taking small aliquots from each test flask
for measurements.

The experimental design of the study included seven test concentrations plus one control. Three replicates per concentration and three replicates per control were used. The initial cell density in the test cultures was approximately 5000 cells per millilitre. The pH and values at the start and the end of the study ranged from 7.9

- 10.4. Water hardness of the final nutrient medium was 22.5 mg/L CaCO 3.

RESULTS

Endpoint value(s): Based on nominal concentrations reported: E
r C 50 = 104 mg/L; E
r C 10 = 54 mg/L; NOEC (growth rate) = 32 mg/L; LOEC (growth rate) = 100 mg/L; E y C 50 = 60 mg/L;
E y C 10 = 37 mg/L; NOEC (yield) = 10 mg/L; LOEC (yield) = 32 mg/L

Res ults remarks: The following validity criteria of the test were met:

The cell density in the control cultures increased by a factor of at least 16 within 72 hours. The test period may be shortened to at least 48 hours to maintain unlimited, exponential growth during the test as long as the minimum multiplication factor of 16 is reached.

The mean coefficient of variation for section

- by

- section specific growth rates (days 0

- 1, 1

- 2 and
2

- 3, for 72 hour tests) in the control cultures did not exceed 35%.

The coefficient of variation of average specific growth rates during the whole test period in replicate control cultures did not exceed 7%.

CONCLUSIONS

The 72

- hr EC 50 was found to be 104 mg/L for growth rate and 60 mg/L for yield. The 72

- hour NOEC and LOEC for growth rate were were 32 and 100 mg/L, respectively. The 72

- hour NOEC and LOEC for yield were 10 and 32 mg/L, respectively.

STUDY RELIABILITY

[1] Reliable w ithout restrictions.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

7 REFERENCE

Caspers. 2010. Alga, growth inhibition with DETDA (Diethyltoluylendiamin

- 80); Study No. 2010/0109/01. Performing Laboratory: CURRENTA GmbH & Co. OHG. Leverkusen, Germany. Sponsor: Albemarle Corporation, Louvain

- la

- Ne uve, Belgium.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

8 C

- 4 . Acute Toxicity

Summary of endpoint: Adequate

Study 1: Acute oral toxicity study in rats ( Heenehan et al., 1977 )

Title: Acute Oral Toxicity Study

Th is study is: Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity of the tested commercial product was not specified

Remarks: C lear, light colored liquid; the typical composition of the commercial product is 75

- 81% 3,5

- diethyltoluene

- 2,4

- diamine, 18

- 20% 3 ,5

- diethyltoluene

- 2,6

- diamine, 0.5

- 3% dialkylated

m

- phenylenediamines and < 0.08% water.

METHOD

Method/guideline followed: Not indicated

Test type: Acute Oral

-- Rat

GLP compliant?: Not indicated

Year study performed: 19 77

Test species: Wistar rats

Number of animals/sex/dose: 5

Route of administration: Oral gavage

Vehicle: Corn oil

Doses/concentrations tested: 280, 400, 560, 780 or 1100 mg /kg

Statistical methods used: None specified

Test method/conditions remarks: Wistar rats (5/sex/dose) were administered a single dose of DETDA by gavage in corn oil at doses of 280, 400, 560, 780 or 1100 mg / kg. Animals were observed for 14 days.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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9 RESULTS

Endpoint value(s): LD 50 = 485 mg/kg

- bw

Results remarks: No additional details were available from this study summary

.

CONCLUSIONS

The oral LD50 was estimated to be 485 mg / kg

- bw with 95% confidence limits of 406 and 564

mg / kg

- bw

.

STUDY RELIABILITY

[ 2] Reliable with restrictions. Missing details included test method/guideline followed, purity/composition of the tested commercial product, clinical observations/ findings, and whether or not body weight data were recorded.

REFERENCES

Heenehan

, P

. , Braun, W

. , and Rinehart

, W. 1977. Acute O ral T oxicity S tudy. Compound:
D iethylated T oluenediamine. Project No. 4448

- 77. Performing Laboratory: Bio / dynamics Inc. Submitted by the Ethy l Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

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10 Study 2: Acute inhalation toxicity study in rats (Thackara and Rinehart, 1978)

Title: An Acute Inhalation Toxicity Study of Diethylated Toluenediamine in the Rat

Th is study is: Adequate Not Adequate

T his study is not adequate for the following reasons: (1) Duration of exposure to the test substance was for 1 hour rather than 4 hours as stipulated by the OPPTS guideline 870.1300 for
A cute Inhalation Toxicity; (2) The concentration of test substance in the breathing zone was not measured as stipulated by guideline 870.1300; and (3) The study tested a single concentration rather than three as stipulated by guideline 870.1300 . Details mi ssing from the study summary included purity and composition of the tested commercial product and test method/guideline
followed.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity of the tested commercial product was not specified

Remarks: C lear, light colored liquid; the typical composition of the commercial product is 75

- 81% 3,5

- diethyltoluene

- 2,4

- diamine, 18

- 20% 3 ,5

- diethyltoluene

- 2,6

- diamine, 0.5

- 3% dialkylated

m

- phenylenediamines and < 0.08% water.

METHOD

Method/guideline followed: Not indicated

Test type: Acute Inhalation

-- Rat

GLP compliant?: Not indicated

Year study performed: 1978

Test species: Sprague

- Dawley rats

Number of animals/sex/dose: 5

Route of administration: Inhalation, 1 hr

Vehicle: None

Doses/concentrations tested: 2.45 mg/L

Statistical methods used: None specifiedFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

11 Test method/conditions remarks: Sprague Dawley rats (5 / sex / dose) were exposed for 1 hour to a nominal exposure concentration of 2.45 mg DETDA/L. No additional details were available from this study summary

.

RESULTS

No mortality occurred during the 14 d observation period. Signs o f toxicity were observed during the exposure and included excessive lacrimation and salivation, mucoid nasal discharge, labore d breathing, and inactivity. Most of the observed signs disappeared duri ng the 4 hr period post

dosing. Lung discoloration was o bserved at necropsy on d 14.

Endpoint value(s): LD 50 = 2.45 mg/L

Results remarks: No additional details were available from this study summary

.

CONCLUSIONS

The inhalation LD50 (1

- hr) was > 2.45 mg/L

.

STUDY RELIABILITY

[ 3] Not reliable

. Based on information that the sponsor provided in an abstract, this study is not reliable for the following reasons: (1) Duration of exposure to the test substance was for 1 hour rather than 4 hours as stipulated by the OPPTS guideline 870.1300 for Acute Inhalation Toxicity; (2) The concentration of test substance in the breathing zone was not measured as stipulated by guideline 870.1300; and (3) The study tested a single concentration rather than three as stipulated by guideline 870.1300 . Details missing from the study summary included purity and composition of the tested commercial product and test method/guideline followed.

REFERENCES

Thackar, J., and Rinehart, W. 1978. An Acute Inhalation Toxicity Study of Diethylated Toluenediamine in the Rat. Proj ect No. 77

- 1962. Performing Laboratory: Bio/dynamics Inc. Submitted by the Ethyl Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

12 Study 3 : Acute dermal toxicity study in rabbits (Heenehan et al., 1977)

Title: Acute D ermal T oxicity St udy

Th is study is: Adequate Not Adequate

This study is not adequate because i mportant study details were missing from the study summary ( includ ing purity and composition of the test substance and test method/guideline followed ) and
the LD 50 could not be determined.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: C lear, light colored liquid; t he typical composition of the commercial product is 75

- 81% 3,5

- diethyltoluene

- 2,4

- diamine, 18

- 20% 3,5

- diethyltoluene

- 2,6

- diamine, 0.5

- 3% dialkylated

m

- phenylenediamines and < 0.08% water.

METHOD

Method/guideline followed: Not indicated

Test type: Acute Dermal

-- R abbit

GLP compliant?: Not indicated

Year study performed: 1977

Test species: New Zealand White albino rabbits

Number of animals/sex/dose: 4, sex not indicated

Route of administration: Dermal

Vehicle: None

Doses/concentrations tested: 705, 1000, 14 10 and 2000 mg /kg

- bw

Statistical methods used: None specified

Test method/conditions remarks: A total of 16 New Zealand White albino rabbits were treated
derma lly with DETDA at doses of 705, 1000, 14 10 and 2000 mg / kg. The hair was clipped prior treatment, and the dermal stratum corneum of half the rabbits abraded at the application site. The

test material was held in place with an impermeable bandage throughout the 24 hr exposure period. Animals were observed for 14 days.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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13 RESULTS

There were 1, 4, 2 and 3 deaths at 705, 1000, 1410 and 2000 mg/kg

- bw, respectively

Endpoint value(s): LD 50 = not determined

Results remarks: No additional details were available from this study summary

.

CONCLUSIONS

Due to inconsistent mortality, a meaningful LD 50 could not be determined.

STUDY RELIABILITY

[ 3] Not reliable. Important study details missing from the study summary included purity a nd composition of the test substance and test method/guideline followed. Additionally, the LD 50 could not be determined.

REFERENCES

Heenehan

, P

. , Braun, W ., and Rinehart

, W. 1977. Acute D ermal T oxicity St udy. Compound:
D iethylated T oluenediamine. Project No. 4449

- 77. Performing Laboratory: Bio /d ynamics Inc. Submitted by the Ethyl Corporati on, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

14 C

- 5

. Repeated

- Dose Toxicity: Test Requirement (F1) under Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Adequate

Study 1 : 90

- Day repeated

- dose oral toxicity study in rats ( Naismith and Mathews, 1987 )

Title: Subchronic 90

- d ay o ral t oxicity s tudy in r ats

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity : Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: Amber liquid ; Run No. 544; Drum No. 613 1

METHOD

Method/guideline followed: This study was conducted according to OPPTS guidelines for the
conduct of a subchronic 90

- d study ( O rganization for Economic Co

- operation and Development (OECD) Guidelines for Testing Chemicals, ISBN 92

- 64

- 12221

- 4, adopted by the council at its
535 th meeting on 12 May, 1981 )

.

Test type: Subchronic 90

- Day Oral Toxicity Repeated

- Dose

GLP compliant?: Yes

Year study performed: 1986

Test species: Sprague

- Dawley rats from Charles River Laboratories, Wilmington, Massachusetts; Rats used in this study weighed 183

- 186 g (males) and 129

- 132 g (females) and were 41 days old at initiation.

Number of animals/sex/dose: 20

Route of administration: Oral

- diet

Vehicle: No ne

Exposure duration: 90 days (7 days/week)

Doses/concentrations tested: 0, 50, 125 or 320 ppm (0, 5, 12.5 and 32 mg/kg/day, respectively)Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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15 Statistical methods used: Evaluation of equality of means was made by the one way analysis of variance using the F distribution to assess significance. If significant differences among the means were indicated, Dunnett's test was used to determine significant differences from control

means. Analysis of discrete data where appropriate was conducted using non

- para metric procedures. All raw data were summarized and s tatistically evaluated using L A BCA T modules designed by Innovative Programming Associates, In c., One Airport Place, Princeton, N J 08540.

Test method/conditions remarks: Four groups of rats (20 males a nd 20 females per group)

were initiall y fed with the test article at d ose levels of 0, 50, 125 and 320 ppm, seven days per week over a period of 90 days. Pharmacotoxic si g ns were recorded as they were observed, including the time of onset, degree and duration. Ca g eside observations included, but were not limited to changes in skin and fur, eyes and mucous membranes, and also respiratory, circulatory, autonomic and central nervous system, somatomotor activity and behavior patterns. Measurements were mad e of food c onsumption twice weekly, the die t was replenished with fresh
freezer stored diet a t the time of food consumption and the rats were weighed weekly. At the end
of the 90

- day period al l surviving animals were sacrificed by CO 2 asphyxiation. Any wea k or
moribund animals were removed, sacrificed and necropsied during the study as deemed necessary by the study director and principle investigator.

Blood was drawn by percutaneous cardiocentesis. All animals were fasted overnight prior to the
time of sacrifice. The following determinations were made on twenty rats (10 /sex) prior to
initiation. In addition, after 90 d ays of feeding, five ( 5) animals per sex per group were chosen by
random number tables and the following hematological and clinical chemis try parameters were determined: h emoglobin , h ematocrit , e rythrocyte count , t otal and differential l eukocyte counts platele t count , c alcium , p hosphorus , c hloride , s odium , p otassium , f asting g lucose , s e ru m alanine
aminotransferase , s erum aspartate aminotrans ferase , g amma glutamyl transpeptidase , u rea nitrogen , a lbumen , b lood creatinine , t otal bilirubin , and t otal serum protein measurements

.

Ophthalmological examinations using an ophthalmoscope were made prior to the administration
of the tes t substance on all animals. A t termination of the study 5 /sex/group chosen from a table
of random numbers were evaluated. If changes in the eyes were detected all the animals would
be examined.

A ll animals were subjected to necropsy which included examination of the ext ernal surface of the body, all orifices, and the cranial, thoracic, abdominal and pelvic cavities and their contents

. The following organs were weighed: liver, gonads

, adrenal glands

, brain and kidneys

.

The following organs and tissues from the animals a t t he 90

- day sacrifice were preserved in 10%
neutral buffered fo rmalin for future histopathological examination: all gross lesions , b rain

including sections of medulla/pons , c erebellar cortex and cerebral cortex , pituitary, t hyroid/ parathyroid , t hymus , l u ngs , t rachea , h eart , s ternum with bone marrow , s alivary glands , l iver

,
s pleen , k idneys/adrenals , p ancreas , g onads , u terus , a ccessory genital organs (epididymides, prostate, and, if present, seminal vesicles) , a orta , s kin , e sophagus , n asal turbinates , s tomach

, d uodenum , j ejunum , i leum , c ecum , c olon , r ectum , u rinary bladder , r epresentative lymph node

,
mam mary gland , t high musculature , p eripheral nerve , e yes , f emur

- including articular surface

,
s pinal cord at three levels

- cervical, midthoracic and lumbar and e xorbital lachrymal glands

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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16 A full histopathol ogic evaluation of the above organs and tissues was evaluated in all control and high dose animals sacrificed at 90 days of treatment. All animals which died or were sacrificed
in a moribund condition pri or to completion of the study were also subjected to a full histopathologic evaluation of the above named tissue s and organs. All gross lesions in
All animals were examined histologically.

RESULTS

Endpoint value(s): LOAEL = 50 ppm (5 mg/kg

- bw/da y ; lowest dose tested) based on mottled kidneys, dilated pelvis, subcapsular cystic or presence of calculi, lobular or small livers, congested lungs, crystalline material in the gastrointestinal tract with gas distention, increased
hematocrit levels in fema les, minimal to moderate multifocal degeneration of the acinar cells of the pancreas and increased splenic pigmentatio n in f emales; NOAEL = No t established.

Results remarks: Non

- specific clinical signs were detected in a few rats from the control, low

an d mid dose groups. These included lesions and / or scab formations with alopecia. In addition, piloerection, chromodacryorrhea and poor grooming were observed. The majority of the high dose rats of both sexes displayed nonspecific clinical signs of toxici ty: abnormal stance, abnormal gait, flaccid body tone, ptosis, decreased activity, chromodacryorrhea, elevated gait, loss of skin elasticity, poor grooming, dyspnea, tremors, ataxia and morbidity. In general, these signs resulted in either moribund sacrif ice or death.

Mean body weight of male and female rats in the high dose group (320 ppm) was statically lower than their respective controls on study Days 7 through 90 and 14 through 90, respectively. Body weights were decreased in the mid

- dose males (125 ppm) on Days 77 through Day 90; females on Days 28 and 35, and from Day 49 through Day 90. There was no statistically significant difference in the group mean weights in low dose males or females compared to their respective
controls. The high dose male and female body weight gains were significantly reduced on Day 7 throug h Day 35. A statistically significant weight loss was recorded on Day 42 until sacrifice for both the high dose males and females. Mid dose male body weight gains were reduced on D ays 70 and 84. The mid dose females exhibited a statistically significant smaller body weight gain on Days 21, 28 and 84. In addition, the total gain for the high and mid dose groups were significantly reduced

.

Food consumption was statistically reduced from control males in the high dose groups on Days 14, 21, 24, 28, 35 and 38. High dose females consumed less food on Day 17 through Day 52.
Mid

- dose male consumption was significantly reduced on Days 45, 59, 63, 73 and 90. Females from this dosage group were significantly reduced on Days 45, 52, 59, 63, 70, 73 and Day 80 through 90. Control and low dose female food consumption were comparable. Low dose males, however, exhibited statistically significant increases in the amount of feed consumed on Day 3
thro ugh Day 28 and on Day 35.

Twenty

- seven rats in the high dose group died during the study. Thirteen were found dead and
fourteen were moribund sacrificed. The majority of the necropsy observations were non

specific, and included stomach lesions, dark discoloration of the liver, kidneys and / or genitalFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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17 organs and intestines, emaciation and apparent dehydration, lung congestion, liver foci and lack of thymic tissue.

A pre

- termination ocular examination was performed on all the remaining animals. Twenty ocular lesions were noted: 2, 1, 4 and 13 from control to high dose, respectively. With the exception of a focal cataract observed in one mid dose male, observations recorded on the control, low and mid

- dose animals, were considered inconsequential of tre atment. Observations noted in the high dose group included two rats displaying pale fundus, one with conjunctivitis, one multifocal cataract, one multifocal anterior cortical and equatorial cataract each from both eyes and three focal cataracts from the r ight eyes. These noted abnormalities may be considered
to be a direct or indirect effect from test article administration.

Terminal necropsy of the surviving rats revealed similar observations in each respective treatment group: mottled kidneys, dilated pelvis, subcapsular cystic or presence of calculi; lobular or small livers; congested lungs; crystalline material in the gastrointestinal tract with or without gas distention was observed in each treatment group. A few high dose rats, however,
exhibited s mall spleens and a larger number of focal or linear stomach lesions. In general, the high dose animals appeared thin and dehydrated.

Mean kidney, liver, testes and brain weights were statistically lower than the control means in high dose males. Mean hi gh dose male and female relative

- to

- body adrenal, kidneys and brain weights were significantly increased compared to the control groups. In addition, the mid dose male and female liver, kidney and female brain weights to body weight were statistically lar ger than the control values. High dose males also displayed significant increases in kidney, liver and testes weight when compared to the percent body weight.

Evaluation of the blood chemistry parameters revealed statistically significant increases in SGPT, SGOT and blood urea nitrogen values in the male and female high dose groups. In high dose males, mean serum albumin, globulin, calcium, phosphorus, creatinine and total protein levels were significantly lower than those of the controls. High dose f emales exhibited significant increases in GGTP and decreases in total protein content.

High dosed males exhibited statistically significant increases in erythrocyte and hemoglobin

counts. High dose male hemoglobin content was also significantly lower than control males. Hematocrit and erythrocyte values were statistically higher in the high dose females. Leukocyte counts, platelet counts and mean corpuscular volume were lower high in high dose males. Low and mid dose females exhibited significantly larger hematocrit levels.

Treatment

- related microscopic changes were present in the eyes, pancreas, bone marrow, liver,

s pleen, kidneys, and mesenteric lymph nodes of almost all male and female rats in the high dose. In addition, atrophy was present in the salivary gland, thymus, stomach, and genital organs of both sexes in this group. Treatment

- related changes were present in the pancreas and spleen
from the rats in the 50 and 125 ppm dose groups. In the high dose rats , there was a high
incidence of b ilateral cataractous change in the eyes, diffuse atrophy of the acinar cells of the

pancreas, vacuolation of the islet cells of the pancreas, bone marrow depletion, renal tubular vacuolation (hydropic change), atrophy of many organs, lymphoid depletion of the spleen,Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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18 thymus and mesenteric lymph node, and increased pigmentation of the liver and spleen.
Minimal to moderate multifocal degeneration of the acinar cells of the pancreas and increased splenic pigmentation in the females were present in the tissues examined from the rats receiving 50 and 125 ppm of DETDA in the diet.

Based upon the results of the Subchronic 90 Day Oral Toxicity Study i n Rats with diethyl
toluene diamine (DETDA) dose levels will be selected for a 24

- month o ncogenicity s tudy in r ats.

CONCLUSIONS

The LOAEL was 50 ppm ( 5 mg/kg

- bw/day ), the lowest dose tested; a NOAEL was not
established.

STUDY RELIABILITY

[2] Reliable with restrictions . Specific test method/guideline followed was not specified.

REFERENCES

Naismith

, R

., and Matthews

, R. 1987. Subchronic 90 D ay O ral T oxicity S tudy in R ats. Study
No.: PH 470

- ET

- 001

- 86

. Diethyl toluene diamine (DETDA). Performing Laboratory: Pharmakon Research International, Inc. Waverly, PA. Sponsor: Ethyl Corporation, Baton Rouge, L A.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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19 Study 2 : 14

- or 28

- Day r epeated

- dose oral toxicity study with 28

- day recovery period in rats ( Bolus and Mathews, 1989 )

Title: Repeated

- dose oral toxicity/reversibility study in rats

- 28 Day

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: Clear amber liquid ; Lot No. 2

- 87 and Run No. 544, Drum No. 613 1

METHOD

Method/guideline followed: This study was conducted in compliance with the Good Laboratory Practices Regulations as stated in the EPA Good Laboratory Practice Standards [Subpart I, Part 792, Chapter I of Title 40, Code of Federal Regulations], as well as the Organisation for Economi c Co

- operation and Development (OECD) Guide lines for Testing Chemicals, ISBN 92

- 64

- 12221

- 4, adopted by the council at its 535 th meeting on 12 May, 1981.

Test type: Subchronic 28

- Day Oral Repeated

- Dose

GLP compliant?: Yes

Year study performed: 1987

Test species: Sprague

- Dawley rats from Charles River Laboratories, Wilmington,
Massachusetts ; Rats used in this study were 48 days old and weighed 202

- 211 g (males) and
147

- 154 g (females) at initiation

.

Number of animals/sex/dose: 15

Route of administration: Oral, dietary

Vehicle: None

Exposure duration: 14 or 28 days

Doses/concentrations tested: 0 (control), 50, 125 or 320 ppm (0, 5, 12.5 and 32 mg/kg/day, respectively)

Statistical methods used: Evaluation of equality of means was made by the one way analysis of variance using the F dis tribution to assess significance. If s ignificant diffe r ences among the means were indicated, Dunnett's test was used to determine significant differ ences from controlFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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20 means. Tukey's test was used to determine s ignificant differences between the DE T DA lot s a t the same dose levels.

All raw data were summarized and s tatistically evaluated using LABCAT modules designed by
Innovative Programming Associates, Inc., One Airport Place, Princeton, NJ 08540 or SYSTAT,
a PC based statistical package designed by SYSTAT, Inc,, Evanston, IL 60201.

Test method/conditions remarks: A repeated dose study was conducted to evaluate the progression and reversibility of toxicity observed in the 90

- day study, and to determine if toxicity differed between 2 different DETDA lots. The test articles, diethyl toluene diamine (DETDA), Lot # 2

- 87 and Run 544, Drum 613 1 (test article in previous 90 d study), were incorporated into standard certified commercial laboratory rat diet and fed ad libitum to seven groups of Sprague

- Dawley rats (3 treatment groups per test article) seven days per week for a period of 14 or 28 days. Each of the seven dose groups (n=15 rats/sex/group) were fed the diet mixture at dose levels of 0 (con trol) ppm, 50 (low) ppm, 125 (mid) pp m or 320 (high) pp m of
either DETDA lot. At the end of the 14

- and 28

- day treatment intervals, five randomly selected rats per sex per treatment group were necropsied. The remaining rats received untreated control
die t for 28 additional days and served as the recovery/reversibility group. Signs of toxicity were recorded as they were observed , including the tim e onset, degree and duration. Cageside
observations included, but were not limited to, changes in skin and fur

, eyes and mucous membranes, and also respiratory, circulatory, autonomi c and central ne rv ous system, somatomotor activity and behavior patterns. Mortality checks were made daily and recorded. Twice weekly measurements were made of food consumption, the diet was replenished with fresh freezer stored diet, and the animals were weighed.

Blood was drawn by percutaneous cardiocentesis. All animals were f asted overnight prior to the
time of sacrifice. The following determinations were made on ten rats (5/sex ) prior to i nitiation. In addition, the following hematology and clinical chemistry parameters were made on a ll
animals sacrificed approximately 24 hours after 14, 28 and 56 days: h e moglob in , h ematocrit

e rythrocyte count , t otal and differential leukocyte counts , p latelet count , c alcium , phosphoru s ,
c hloride , s odium , p otassium , fasting g lucose , s erum alanine aminotransf erase , serum aspartate aminotransfe rase , s erum amylase , s erum lipase , g amma glutamyl transpeptidase , urea nitro gen ,
a lbumen , b lood creatinine , t otal bilirubin , t otal ser u m protein measurements and s erum insulin

.

Ophthalmological examinations using an ophthalmoscope were made prior to the administration
of the test substance on Days 14 and 28 of treatment and at the end of recovery (D ay 56) on al l
animals.

All animals were subjected to necr opsy, which included examination of the external surface o f the body, all orifices, the cranial, thoracic, abdominal and pelvic cavities and their contents. The following organs were weighed: liver

, gonads

, adrenal glands

, brain and kidneys

.

The following organs and tissues fro m the animals sacrificed after 14 and 28 days of treatment
and after the 28 day recovery period were preserved in a suitable medium for future histopathological examination: a ll gross lesions , b rain ( including sections of m edulla/pons ),

c erebellar cortex and cerebral cortex , p ituitary , t hyroid/parathyroid , t hymus , l ungs , t rachea

,Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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21 h eart , s ternum with bone marrow , s alivary glands , l iver , s pleen , k idneys/adrenals , p ancreas , g onads , u terus , a ccessory genital organs (epididymis, prostate, and, if present, seminal vesicles)

,
a orta , s kin , e sophagus , n asal turbinates , s tomach , d uodenum , j ejunum , i leum , c ecum , c olon

,
r ectum , u rinary bladder , r epresentative lymph node (mesenteric) , m ammary gland , t high
musculature , p eripheral nerve , e yes , f emur

- including articular surface , s pinal cord a t three levels ( cervical, midthoracic and lumbar ) and e xorbital lachrymal glands

.

A full histopathologic evaluation of the following organs and tissu es were performed i n all
control and 320 ppm dosed animals sacrificed approximately 24 hours after 14 and 28 days of

treatm ent and after the 28 day recovery period : all gross lesions , l ungs , l iver , a drenal glands

, k idneys , g onads , s alivary gland , e yes , p an creas , s pl e en , m esenteric l ymph node , t hymus , s ternum with bone marrow and a dipose tissue deposition whenever possible

.

In addition, the sternum with bone marrow, eyes, kidney, liver, mesenteric lymph node,

pancreas, salivary gland, spleen, thymus, gross lesions and adipose ti ssue deposition was
evaluated in l o w and mi d dose groups.

RESULTS

Endpoint value(s): LOAEL (Run 544, Drum 6131) = 1 25 ppm (12.5 mg/kg

- bw/day ) based on increased relative testes weights, compound

- related degenerative changes in the acinar pancreas, degeneration of islet cells of the pancreas, cachexia and diabetes in males; NOAEL (Run 544, Drum 6131) = 50 ppm (5 mg/kg

- bw/day ) ; LOAEL (Lot 2

- 87) = 50 ppm (5 mg/kg

- bw/day) based on decreased platelet counts in males at the lowest dose le vel tested; NOAEL (Lot 2

- 87) = Not
established

Results remarks: No clinical signs of toxicity were observed in female rats in any treatment group during the study. Clinical signs of toxicity were observed in the majority of the high dose
DETDA

- Run 544

- t reated males beginning on or about Day 35 and continuing until study
termination. These signs included decreased activity, abnormal stance, abnormal gait, poor grooming, decreased body tone, piloerection and excessive defecation and scab formation.

No rats died on test prior to scheduled sacrifice.

Mean male body weights in the high dose groups were statistically lower than the control mean during the majority of the study. During the recovery period (Days 28

- 56), the high dose male Run 544 group cont inued to lose weight, while animals treated with Lot 2

- 87 at the same dose gained weight. Female body weights were significantly reduced in both high dose groups compared to the control mean at three intervals during the study.

Mean male body weight in 3 20 pp m Run 544 group were significantly lower than that of the 320

pp m Lot 2

- 87 group mean during Days 49 through 56. No significant differences between the
two lots were noted for the females.

The daily body weight gains were significantly reduced at several intervals for the males in b o th
the Run 544 and Lot 2

- 87 treatment groups a t each level when compared to the controls. FemaleFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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22 body weight gains were less severe ly affected however, significance was indicated when compared t o the controls.

Statistically significant differences were also noted when the daily gains of the differ ent DETDA treatment groups were compared. Trend

- related signif ic an t differences were observed for the high dose males. A significantly lower value was noted for the mal e high dose Run 546 group on Day 56, when compared to the Lot 2

- 87 treated rats. The total mean daily gain was also significantly reduced in the high dose Run 544 group. There were no such trend

- related
differences observed for the females.

The daily food consumption for the males was significantly reduced in both high dose DETDA groups at several time periods, when compared to the controls. There were no significant differences noted in food consumption of the males or females when groups treated with the different DETDA Lots were compared to each other by dose level.

Ocular examinations were performed on all animals prior to the scheduled sacrifices. Lesions noted at 14 and 28 days of DETDA treatment were considered inconsequential to the
ad ministra tion of either test article. The pre

- termination ocular examination, performed on Day 56, detected multifocal anterior cataracts in 2 high dose Run 544 male rats. These lesions suggest a possible ocular toxicologic effect of the test compound.

The major ity of necropsy observations recorded at either the 14

- or 28

- day interim sacrifices

were non

- specific in nature. These observations included enlarged mandibular lymph nodes, scabs on the skin, lung and liver abnormalities, enlarged mesenteric nodes, kidn eys exhibiting cortical cyst or dilated pelvic areas, parovarian uterine cysts, slight uterine hydrometra and a red area on the tip of the heart. Observations recorded at the terminal sacrifice (Day 56) included similar observations of the lungs, livers a nd kidneys. In addition, changes which were specific to the high dose Run 544 male group included reduced adipose tissue, rough hair coat, small salivary, glands, small spleens, poorly visible, dark and small pancreata, small testes, seminal vesicles, epi didymides, prostrate and gastrointestinal tract lesions. There were no similar DETDA related changes noted at necropsy for the females.

There were no statistically significant differences observed in the absolute male or female organ weights at the Day 14 or Day 28 necropsy. At the Day 56 terminal necropsy, the high dose Run 544 male body weights, liver and testes weights were significantly reduced, when compared to the control group. No significant differences were noted for the females at Day 56.

Co mparisons by dosage group between the DETDA materials indicated the high dose male body weights, absolute liver and testes weights in the Run 544 group were significantly lower than the
Lot 2

- 87 group at the terminal (Day 56) necropsy.

A statistically significant increase in the high dose male 2

- 87 relative brain and testes to body weights was observed at the Day 14 necropsy, when compared to the controls. The mid dose Run 544 male relative testes weights were also significantly larger. There were no significant organ weight changes noted for the females, when the dosage groups were compared to theFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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23 controls at the Day 14 interim sacrifice. The male relative liver weights were significantly larger in both high dose DETDA treated groups at the Day 28 ne cropsy.

Significant increases were noted in both high dose DETDA treated female relative kidney weights. In addition, the female high dose Run 544 brain and liver weights were significantly larger, when compared to the control group.

There were no signi ficant differences observed for either the male or female relative organ to body weights, when comparisons were made between the different DETDA materials by dose level at the Day 14 or Day 28 interim sacrifice.

At terminal necropsy (Day 56), the high dos e Run 544 males displayed significantly larger relative brain, kidney and adrenal to body weights as compared to the controls. Females in the high dose 2

- 87 group exhibited significantly larger relative kidney weights, when compared to
the controls.

When comparisons between DETDA materials were analyzed, significantly lower relative brain and kidney to body weights were recorded in the Run 544

- high dose treated males versus the 2

- 87 males. No significant differences were noted for the females.

No statis tically significant differences were observed for either the male or female relative organ to brain weights at the Day 14 or Day 28 interim sacrifices when compared to the control group. At the Day 56 necropsy, the percent liver to brain weight was signif icantly reduced in the high
dose Run 544 treated males.

There were no significant differences noted for the relative organ to brain weights, when the different DETDA materials were compared by treatment level to each other at any of the
scheduled sacrific es.

Significant differences between controls and DETDA treatment groups of the same dose at each
scheduled sacrifice were detected for certain serum chemistries. The majority of the differences were noted in the Run 544 mid and high dose male and female dosage groups at the Day 28 interim sacrifice and the Day 56 terminal sacrifice. There were however, significant differences between controls and low dose DETDA groups at each sacrifice.

Low dose Lot 2

- 87 male platelet counts were significantly lower tha n the controls at the Day 14 interim necropsy. At Day 28, significant hematological differences from controls were high dose male and mid dose female platelet counts.

Comparisons of DETDA materials at the Day 28 interim sacrifices indicated the platelet counts for each Run, 544 DETDA treated female were significantly higher than the Lot 2

- 87 females.

At the terminal necropsy (Day 56), the high dose Run 544 males exhibited a significant increase in hemoglobin and decrease in leucocyte and platelet counts, comparing controls alone.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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24 When comparisons were made between DETDA formulations, the hemoglobin values were significantly higher and the leucocyte counts lower in the high dose Run 544 males.

Compound

- related degenerative changes in the acinar pancreas at 125 ppm and 320 ppm in males and 320 ppm in females were detected in rats exposed to DETDA 2

- 87 and DETDA Run 544 Drum 6131 for twenty

- eight days. A similar pancreatic acinar degeneration was not present at the 50 ppm dosage for either compound. Male rats were more severely affected and at an
earlier time than the female rats. The 28

- day recovery period allowed for an almost complete recovery from the pancreatic effects of DETDA 2

- 87. However, the pancreatic changes in the males exposed to DETDA Run 544 Drum 613 1 progressed to degeneration of the islet cells of the pancreas and secondary changes of cachexia and diabetes.

In summary, the results of this study should be evaluated with consideration for those of the previous 90

- d study. The results of the two studies indicate the target organ to be the pancreas. Male rats were more severely affected and at an earlier time and lower dose than females. Histologically, pancreatic acinar cells were affected first; islet cell involvement followed
afterward in a time and dose dependent manner. Pathology in other organs occurred after or in conjunction with islet cell involvement and appeared secondary to the metabolic changes induced by the pancreatic toxicity. Secondary effects included ocular cataracts in animals with histologic evidence of islet cell toxicity. It was postulated these cataracts were associated with and related to hyperglycemia and thus the pancreatic toxicity. Toxicity of DETDA in the rat may vary with lot. A difference in toxicity between lots was observed. After exposure for 28 consecutive days, DETDA Lot 2

- 87 exerted an effect, which was less t oxic, than the Run 544,
Drum 613 1 preparation.

CONCLUSIONS

Based primarily on the severity and pr o gress i ve treatment

- related histopathological changes of
the rats with the Run 544, Drum 6131 material and secondly the correlated alterations on chemical chemistry, it appears that the DETDA Lot 2

- 87 formulation was less toxic than the Run 544, Drum 6131 preparation.

The LOAEL and NOAEL for Run 544, Drum 6131 were 125 and 50 ppm (12.5 and 5 mg/kg

bw/day ) , respectively. The LOAEL for Lot 2

- 87 was 50 ppm (5 mg/kg

- bw/day ) , the lowest dose tested; a NOAEL for Lot 2

- 87 was not established.

STUDY RELIABILI TY

[2] Reliable with restrictions . Details were missing from the study summary including purity

a nd c omposition of the test substance and test method/guideline followed

.

REFERENCES

Bolus, G., and Matthews, D. 1989. Repeated Dose Oral Toxicity/Reversibility Study in Rats

- 28 Day. PH 436

- ET

- 001

- 87. Diethyl toluene diamine (DETDA). Performing Laboratory: Pharmakon Research International, Inc. Waverly, PA. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

25 Study 3 : 28

- Day repeated

- dose oral toxicity study in rats ( Naismith, 1986)

Title: Repeated dose oral toxicity study in rats

– 28 day dose

- range

- finding

This study is : Adequate Not Adequate

This study is not adequate because it is a range

- finding study, in which clinical chemistry, hematology and histopathology analyses were not performed. Additionally, the test guideline
used was not indicated.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1 ; Synonym: Diethyltoluenediamine (DETDA)

Remarks: Trade name: ETHACURE 100 Curative ; Physical state: Amber

- colored liquid; Lot: Run #544, Drum # 6131

METHOD

Method/guideline followed: Not indicated

Test type: Subchronic 28

- Day Oral Repeated

- Dose

GLP compliant?: Yes

Year study performed: 1986

Test species: Sprague

- Dawley rats

Number of animals/sex/dose: 5

Route of administration: Oral

- diet

Vehicle: None

Exposure duration: 28 days (7 days/week)

Doses/concentrations tested: 0, 40, 400, 800, 1200, 1600 or 3200 ppm (0, 4, 40, 80, 120, 160 and 320 mg/kg

- bw/day, respectively)

Statistical methods used: Evaluation of equality of means was made by the one way analysis of variance using the F distribution to assess significance (p ≤ 0.05). If significant differences among the means were in dicated, Dunnett’s test was used to determine significant differences from control means (p ≤ 0.05).Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

26 Test method/conditions remarks: A 28

- day dose range finding study was conducted in rats to
select dose levels for a 90

- day study. The commercial DETDA pr oduct (Run 544) was mixed with standard certified commercial laboratory rat diet and fed ad libitum to seven groups of Sprague

- Dawley rats, seven days per week for 28 days (except where noted below). Each of seven groups (n=5 rats/sex/dose) was fed the diet mixture at dose levels of 0, 40, 400, 800, 1200, 1600 or 3200 ppm DETDA. Animals were observed daily for clinical signs of toxicity. Body weights and food consumption were measured weekly. All animals were subjected to a gross necropsy. No clinica l chemistry, hematology or histopathology was performed in this dose

range

- finding study. This study was conducted according to U.S. FDA, U.S. EPA, and OECD Good Laboratory Practices.

RESULTS

Endpoint value(s): The LOAEL was 400 ppm (40 mg/kg

- bw/day) an d the NOAEL was 40 ppm (4 mg/kg

- bw/day) in both males and females.

Results remarks: Clinical signs of illness were not observed in the control group. No specific
test article

- related clinical signs were seen at the 40 or 400 ppm doses. Clinical signs o f toxicity were observed in the higher doses, with the incidence and severity increasing in a dose dependent manner with study duration. One rat (female) died at the 3200 ppm dose level. Necropsy revealed a fluid

- filled, reddish

- brown, gastro

- intestinal t ract. Due to extreme weight loss and clinical signs, the remaining rats in the 3200 ppm dose group were sacrificed on day 17.

Mean female body weights were significantly lower than the control mean throughout the study in the 800, 1200 and 1600 ppm dose groups. Mean female body weight in the 400 ppm group was statistically reduced during the final week of the study. Mean body weight of the 40 ppm group was comparable to the control mean. Body weights of the male rats were similarly reduced during the s tudy, although statistical significance was observed only on Day 3 and weeks 3 and 4 at the 800 ppm level. Mean body weights in the 3200 ppm dose group (both male and female) were statistically reduced from that of the controls until sacrifice.

Mean food consumption in males in the 800 to 3200 ppm groups was statistically and/or dose dependently reduced from that of the controls throughout the study. Statistically significant differences between treated and control animals were observed infrequently at t he 400 ppm level. Male food consumption in the 0 and 40 ppm groups was statistically comparable. Food consumption of female rats was statistically reduced at the 800, 1200, 1600 and 3200 ppm dose groups in a similar manner as the males.

No noteworthy ab normalities were recorded at terminal necropsy in the control rats with the exception of a dislocated upper incisor and chromodacryorrhea. Infrequent mottled kidneys, pale kidneys, skin lesions with scab formation, congested lungs, white foci or clear foc i on the lungs were recorded in a few rats in the treatment groups. In general, there were no test article

- related lesions recorded at terminal necropsy in any of the treated animals.

At terminal necropsy the kidneys and livers were weighed. Male relati ve liver

- to

- body weights were statistically increased at 1200 and 1600 ppm. There was a statistically significant increaseFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

27 in the mean relative kidney weights at the 1200 ppm level. No statistically significant differences for relative organ weights were observed in the female rats.

CONCLUSIONS

The LOAEL in a 28

- day repeated

- dose oral study in Sprague

- Dawley rats was 400 ppm (40 mg/kg

- bw/day) in males and females, based on reduced food consumption in both sexes and reduced body weight in females. The NOAEL was 40 ppm (4 mg/kg

- bw/day) in males and
females.

STUDY RELIABILITY

[3] Not reliable. In this range

- finding study, clinical chemistry, hematology and histopathology analyses were not performed. Additionally, the test guideline used was not indicated.

REFERENCES

Naismith, R. 1986. Repeated dose oral toxicity study in rats

– 28 day dose

- range

- finding. PH
436

- ET

- 001

- 86. Diethyl toluene diamine (DETDA). Performing Laboratory: Pharmakon Research International, Inc. Waverly, PA. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

28 Study 4 : Repeated

- dose dermal toxicity study in rabbits ( Lamb et al., 1981)

Title: Subchronic 21

- day dermal toxicity study on diethyltoluenediamine ( DET D A) in rabbits

Th is study is: Adequate Not Adequate

TEST SUBSTANCE

Identity: 95.78% Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Referred to as “ diethyltoluamine ” (DETA)

Remarks: Brown liquid; Isomer Ratio: 80:20 2,4

- DET D A:2,6

- DET D A

METHOD

Method/guideline followed: Not indicated

Test type: Subchronic dermal toxicity

GLP compliant?: Not indicated

Year study performed: 1980

Test species: New Zealand White rabbits. 2.31

- 3.59 kg (males) and 2.40

- 3.17 kg (females) at study start.

Number of animals/sex/dose: 10

Route of administration: Dermal

Vehicle: None. Test substance was applied undiluted.

Exposure duration: 6 hours daily, 5 d/wk for three weeks

Doses/concentrations tested: 0 (untreated control), 1, 10, 100 mg/kg

- bw/day

Statistical methods used: The Waller

- Duncan k

- ratio t

- test was used to c ompare results of treated rabbits to those of concurrent controls. Differences between the results in a particular group before and after treatment were tested using Student’s t

- test.

Test method/conditions remarks: Young adult male and female New Zeala nd White rabbits
were used to examine the repeated dose toxicity of DETDA when administered dermally. Groups of 20 rabbits (10/sex/dose) were treated dermally with 0, 1, 10 or 100 mg/kg

- bw once daily, five days per week, for a total of 15 doses.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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29 The backs of the rabbits were shaved free of hair using electric clippers with an angra head. The last five rabbits of each sex on each level were abraded on the shaved area using a nylon bristle brush. Rabbits were shaved and abraded weekly, at least the da y before application of the next dose or earlier. At the time of dosing, plastic collars were placed on the animals. The volume of material to be applied was determined from the animals’ most recent body weight and was applied undiluted to the shaved are a on the back. Dosage volumes were measured and applied using a 5 μl Hamilton syringe for level I, a 50 μl Hamilton syringe for level II and a 500 μl Hamilton syringe for level III. The material was then covered with a square of gauze large enough to cov er the liquid, two single layers thick, which was secured with surgical hypoallergenic adhesive tape. The gauze was covered with a larger square of clear plastic secured with adhesive tape. The animals were returned to their cages after application of th e test material. After six hours of exposure, the plastic, gauze and tape were removed and the treated area was wiped with gauze to remove any remaining test material. The collar was removed and the animal was returned to the cage.

The animals were obse rved twice daily on weekdays when material was applied and removed for the appearance of toxicological and pharmacological signs; animals were observed once daily on weekends. Dermal irritation readings according to the method of Draize were made daily
im mediately prior to dosing, including the first day of treatment. Body weights were determined at the beginning of the test and every three to four days thereafter. Surveillance was made to preclude loss of animals due to autolysis, misplacement or other management problems.

Animals were assigned randomly to test or control groups. The first five animal numbers of each sex in each test and control group were then selected for clinical laboratory testing both before initiating the study and on the day of the last treatment.

Hematology tests included determination of hematocrit and hemoglobin concentration, red and white blood cell counts, differential white cell counts and platelet counts.

Blood chemistry tests included determinations of calcium, sodium, potassium, glucose, blood urea nitrogen, total bilirubin, total cholesterol, albumin, globulin and total protein concentrations and of serum lactic dehydrogenase, serum glutamic pyruvic transaminase, serum glutamic
oxaloacetic transaminase and serum alkal ine phosphatase activities.

All test and control animals were subjected to gross necropsy. The liver, kidneys, heart, gonads, thyroid (with parathyroid), adrenals, lungs, brain and pituitary were weighed. Tissues were
collected and fixed in 10% buffered formalin for histopathology examination.

RESULTS

On the first day of treatment, it was observed that a male rabbit to be treated with 100 mg/kg

- bw (no. 434) had not eaten for several days. On that same day, a possible replacement, No. 490, was designated. No. 490 was shaved and treated; a blood sample was collected prior to treatment. On day 3 of treatment, No. 434 appeared thin and had not resumed eating. The results of the clinical studies on the blood sample from No. 490 were normal, so No. 490 replaced No. 434 on day 3 of treatment. Since the ces sation of food consumption by No. 434 occurred prior toFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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30 treatment, its condition could not have been related to treatment. No mortality occurred in
treated rabbits.

No significant differences were apparent among mean body weights of either sex throughout the study. However, two female rabbits receiving 100 mg/kg

- bw and one receiving 10 mg/kg

- bw failed to gain weight throughout the study. All of these showed initial weight gain followed by loss. Of the two rabbits receiving 100 mg/kg

- bw, one failed to r egain her pretest body weight, while the other regained to 0.02 kg higher than her pretest body weight. The female receiving 10 mg/kg

- bw exhibited only approximately half of the total average weight gain of her group. No differences in rate of weight gai n were apparent among male rabbits treated at this dosage.

No behavioral abnormalities were observed in any of the rabbits during the study. Occasional coughing, sneezing and/or ocular discharge were observed in some of the rabbits, including controls, and were considered incidental.

No evidence of skin irritation was observed in control rabbits of either sex. Slight erythema accompanied occasionally by slight edema was observed sporadically in some rabbits at 1 mg/kg

- bw. Rabbits at 10 mg/kg

- bw exhib ited erythema and some edema, and the incidence of these was consistent by the third week of treatment. One female rabbit at 10 mg/kg

- bw exhibited a scab in the treated area of the skin in the third week of treatment. Rabbits at 100 mg/kg

- bw
exhibited er ythema accompanied by very slight to moderate edema through most of the treatment period. The severity of the edema increased during the study. Open wounds were observed in the skin of two males and two females of this group and small scabs were observed on one male and two females with no prior evidence of skin injury.

Occasional small differences in means of hematology results were observed among groups before treatment; however, the results for all the groups were within the range of normal biological variation. In the results after treatment occasional differences in hematology values were observed among groups of male rabbits, but these were not outside the range of normal biological variations. In female rabbits, a dose

- related decrease in monocyt e counts was observed; the counts were significantly different from control females for those receiving 10 and 100 mg/kg

- bw DETDA but not for those receiving 1.0 mg/kg

- bw. However, the counts in these two groups were within the range of counts (0

- 11) obse rved in rabbits of the same sex and appropriate age. No other differences of biologic significance were observed in female rabbits.

In rabbits before treatment no differences in serum chemistry results between groups were
observed that were outside the r ange of normal biological variation. In rabbits after treatment,
dose

- related decreases in serum calcium and sodium concentrations were observed in both male and female rabbits. The calcium concentrations were statistically significantly different from

c ontrol in females receiving 10 or 100 mg/kg

- bw DETDA and in males receiving 100 mg/kg

- bw. The sodium concentrations were statistically significantly different from control in all treated groups of females and in males receiving 10 mg/kg

- bw DETDA but not t hose receiving 100 mg/kg

- bw. Decreased serum potassium concentrations were observed in male, but not female, rabbits; however, the results were not significantly different from control. The cause of the decreases in serum electrolytes was not apparent. Although the decreases were statistically significant and dose

- related, none of the electrolytes decreased to levels likely to impair normalFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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31 physiologic processes. No other differences in chemistry results in male or female rabbits were
observed that were outside the range of normal biological variation.

Chronic dermatitis was observed in treated skin of control and treated rabbits of either sex. The incidence and severity were greater in treated rabbits than in controls, however. The incidence
of derma titis increased with increasing dosage of DETDA . The severity of the lesions increased with dosage in female rabbits but was essentially constant in treated male rabbits. Because dermatitis was observed only occasionally in untreated skin, it was conclud ed that the dermatitis on treated skin was a direct result of applications of DETDA

.

Cysts were observed in thyroid glands of rabbits of either sex. The incidence was dose

- related in males but not in females. These lesions are common histopathologic f indings in rabbits of this age and strain, however, and the cysts observed were probably not a consequence of treatment. The remaining lesions observed occurred randomly in treated and control groups and were
considered incidental.

Endpoint value(s): LOA EL (systemic toxicity) > 100 mg/kg

- bw

- bw/day based on no significant effects at the highest dose tested; NOAEL = 100 mg/kg

- bw

- bw/day. LOAEL (application site irritation) = 10 mg/kg

- bw

- bw/day based on mild to moderate irritation; NOAEL = 1 mg/kg

bw/day

Results remarks: None specified

CONCLUSIONS

Repeated dermal application of diethyltoluamine at 1.0 mg/kg

- bw resulted in very slight irritation of no biologic significance. Application of 10 and 100 mg/kg

- bw resulted in mild to
moderate local irritation and open wounds were observed in skin of some rabbits treated at 100 mg/kg

- bw. No other significant overt toxicity was observed in treated rabbits.

Decreases in serum calcium and sodium concentrations were observed in some treated groups of either sex; however, the electrolyte concentrations were not reduced sufficiently to interfere with normal physiologic processes.

No abnormalities that could be related to treatment were observed at gross necropsy. Histopathologic examination of fixed tissues reveal ed dermatitis in treated skin; no other lesions
that could be related to treatment were observed.

Repeated application of DETDA at 1.0, 10 or 100 mg/kg

- bw resulted in no significant systemic effects. Application of 10 and 100 mg/kg

- bw resulted in signifi cant local effects on treated skin; these effects were more pronounced at the highest dosage. No significant local effects were observed after application of DETDA at 1.0 mg/kg

- bw.

STUDY RELIABILITYFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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32 [2] Reliable with restrictions. The 21

- day duration o f this study is shorter than the 28

- day duration needed to adequately address the repeated

- dose endpoint. Additionally, test method/guideline followed and GLP compliance was not specified.

REFERENCE

Lamb, D., Hixson, E., Brewer, G., Hoss, H., Mallicoat, D., and Schroeder, R. 1981. Subchronic
21

- Day Dermal Toxicity Study on Diethyltoluamine (Diethyltoluenediamine, DETA) in Rabbits. Study Number 80

- 123

- 02. Performing Laboratory: Stanley Research Center, Stilwell, Kansas. Sponsor: Mobay Chemi cal Corporation.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

33 C

- 6 . Genetic Toxicity

– Gene Mutation: Test Requirement (E1) under Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Adequate

Study 1 : Mutagenicity stud ies in Salmonella typhimurium ( Barfknecht and Naismith, 1986 )

Title: Ames Salmonella /microsome plate test

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA)

Remarks : Referred to as DETDA

- OBG, Lot #5868

- 1; Amber liquid; Composition: 0.7% METDA, 78.2% 2,4

- DETDA, 20.3% 2,6

- DETDA, 0.8% other isomers, trialkylated
toluenediamine (as cited in Mulholland, 1986)

.

METHOD

Method/guideline followed: Protocol

- 301 84 EPA/OECD

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1986

Test species: Salmonella typhimurium strains TA 1535, TA1533, TA1538, TA98 and T A100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 100, 330, 1000, 3300 and 10,000 μg/plate (preliminary toxicity screen); 0 (DMSO solvent control), 60, 200, 600, 2000 and 6000 μ g/plat e (plate incorporation assay)

Statistical methods used: In most tests with the Salmonella /Microso m e Assay, results are either clearly positive or clearly negative. A positive result is defined as a reproducible, dose

related increase in the number of his tidine

- independent colonies with at least one dose p o int inducing a mutant frequency value that is two

- fold the solvent control value. Significance at the
95% confidence limit is determined by the program developed by Moore and Felton. This program applies a linear regression analysis t o the data points and any P value greater th an 0.05
is consid ered significant. In addition, the greater the P value, the higher the probability that the data points fit a linear response. This dose

- response relationship occasionally necessitates slight
modification of the original doses in a repeat assay. Alternatively, if the solvent control is withinFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

34 the 95% confidence limits of the historical mean for contro l values and the test chemical produces the highest increase equal to or greater than three times the solvent control value, the

test chemical is considered positive, A negative result is defined as the absence of a reproducible
increase in the number o f histidine

- independent colonies.

Test method/conditions remarks :

Negative and Positive Controls: Tester strains TA1535, TA1537, TA1538, TA98 and TA100 were plated in triplicate with the appropriate solvent (DMSO) , both with and without metabolic activation, to obtain background lawn and revertant colony formation to serve as negative solvent controls. In order to validate the integrity of the test system, all tester strains were also run, in triplicate, with known positive response chemicals. Positive controls not requiring metabolic activation were strain specific and were as follows: sodium azide (10 μ g/plate) for TA1535 and TA100; 9

- amin oacridine (150 μ g/plate) for TA1537; 2

- nitrofluorene (5.0 μ g/plate)
for TA1538 and TA98

The positive control requiring metabolic activation was 2

- anthramine (2

- aminoanthracene) (2.5

μ g/plate) in all strains.

Preliminary Toxicity Screen: The preliminary toxicity screen for the Ames Assay performed without metabolic activation used two of the histidine auxotrophs of Salmonella typhimurium

, TA1538 and TA100. The preliminary toxicity screen was designed to determine at which levels the compound exhibits toxic effects to the Salmonella typhimurium tester strains. The test compound was prepared to a concentration of 100 mg/ml in DMSO at the re quest of the sponsor and five different levels tested for toxicity (100, 330, 1000, 3300 and 10,000 μg/plate) . Top agar, used as an overlay, was reconstituted into a molten state and supplemented with 0.5mM histidine

- 0.5mM biotin at a volume of 0.1 ml/ml of agar, and maintained at 45°C until used. Sterile glass tubes with kaputs were labeled and placed into a Fisher Isotemp R Dry Bath at 45°C. All control and treated tubes and plates were done in duplicate. Using sterile technique, the following were
adde d to each tube: 2 ml aliquots of top agar solution, 0.1 ml of tester strain and 0.1 ml of the appropriate concentration of the test compound. The tubes were vortexed and poured onto minimal glucose plates. The sample was evenly distributed on the plate, an d the top agar overlay was allowed to harden. The same procedure was repeated for each tester strain, within an hour the plates were inverted and placed in a dark 37°C incubator. The plates were incubated for 48 hours following which the background lawn an d spontaneous revertants were observed and scored as normal growth, inhibited growth or no growth. Inhibition was scored by the presence of pindot colonies and the absence of a confluent lawn of bacteria.

Plate Incorporation Assay: The test article, DETDA

- OBG, Lot #5868

- 1, was evaluated in the
five Ames/ Salmonella tester strains TA1535, TA1537, TA1538, TA98 and TA100 at the dose levels of 60, 200, 600, 2000 and 6000 μg /plate with and without the addition of a rat liver derived metabolic activation pre paration. There was 0.10 ml of S

- 9 supernatant (44 mg protein/ml) per 1.0 ml of the S

- 9 mix in the rat liver metabolic activation preparation.

Top Agar: Top agar, used as an overlay, was reconstituted into a molten state and supplemented with 0.5 mM histidine and 0.5 mM biotin at a volume of 0.1 ml per ml of agar, and maintained atFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

35 45°C until used. Sterile tubes with kaputs were labeled and placed into a Fisher Isotemp R Dry
Bath at 45°C. A ll negative and positive control tubes and plates were done in triplicate. All compound

- treated tubes and plates were done in triplicate. Using sterile technique, the following were added to each tube in the following order: 2 ml aliquots of top agar solut ion, 0.1 ml of tester strain, and 0.1 ml of the appropriate concentration of the test compound. The tubes were vortexed and poured onto minimal glucose plates. The sample was evenly distributed on the plate, and the top agar overlay was allowed to harden.

Metabolic Activation System: Tubes requiring metabolic activation had, in addition to the preceding top agar ingredients, an S

- 9 fraction of rat liver homogenate obtained from Aroclor
1254

- treated Sprague Dawley rats.

The S

- 9 fraction was thawed on the day of use and kept cold on ice. 0.5 ml of the S

- 9 mix was added to the tubes which were then vortexed and poured onto minimal glucose plates. The plates
were allowed to harden for several minutes. The same procedure was repeated for each tester
strain. W ithin an hour the plates were inverted and placed in a dark 37°C incubator. The plates
were incubated for 48

- 72 hours, checked for uniform background lawn, and scored by counting revertant colonies on an electronic colony counter interfaced with an Apple computer for data acquisition

.

Bacterial Contaminant Control: To insure the quality of aseptic technique during the assay and also the sterility of solvents, compounds and equipment, standard contamination checks were conducted with the assay. These cont amination checks included the top level of test substance, solvent, top agar and S

- 9 mix at the same volumes as in the assay. The test substance or S

- 9 mix
were added to 2 ml of molten top agar supplemented with 0.5mM histidine

- 0.5mM biotin and poured onto minimal glucose plates. Top agar alone was also plated on minimal glucose plates.
A ll plating was done in triplicate. Plates were incubated for 48 hours at 37°C (± 2°C) and then
scored for contamination.

Data Reporting: In scoring the assay, the pos itive and negative controls were first evaluated. If the negative control values did not fall within the acceptable historical mean values, the remaining plates were not scored and the assay was repeated. A summary of the data is presented in the summary data sheet contained in this report.

RESULTS

Preliminary Toxicity Screen: There were no revertant colonies observed for strain TA100 at the high dose level of 10,000 μg/plate. There were few revertant colonies observed at the high concentration in strain TA1538. Normal bacterial lawn growth and revertant colony numbers
were observed at the other dose levels for both tester strains. Therefore, a dose of 6000 μg/plate

wa s chosen as the high concentration for the Plate Incorporation Mutation Assay.

Plate Incorporation Assay: The test article did not induce increases of mutant frequency in the
five Ames/ Salmonella tester strains TA1535, TA1537, TA1538, TA98 and TA100 witho ut metabolic activation preparation at the dose levels of 60, 200, 600, 2000 and 6000 μg /plate.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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36 The test article induced a statistically significant (at the 95% confidence limit) linear mutational dose response in the five Ames/ Salmonella tester strains T A1535, TA1537, TA1538, TA98 and TA100 with metabolic activation preparation at dose levels of 60, 200, 600, 2000 and 6000

μg /plate. The test article was retested in the five tester strains at dose levels of 500, 1500, 3000,
6000 and 8000 μg /plate with metabolic activation preparation and the positive findings were
confirmed.

In strain TA1535 of Salmonella typhimurium

, a value that was 2.2

- fold the mean solvent control mutant frequency value was observed at a dose level of 6000 μg /plate in the initial a ssay. A

mean mutant frequency value that was 2.9

- fold the solvent control value was observed for tester strain TA1537 at a concentration of 6000 μg /plate in the confirmatory assay. A value that was
28.3

- fold the background mutant frequency occurred at a do se level of 6000 μ g/plate for strain TA1538 in the second mutation assay. In the initial assay, a value that was 8.9

- fold the solvent
control value was observed at the 6000 μg /plate level for strain TA98. In strain TA100, a
maximum fold increase of 3.7

- fo ld over the solvent control mutant frequency value was
observed at the 6600 μg /plate dose level in the second mutation assay.

Genotoxicity result: Positive in the presence of metabolic activation

Cytotoxic concentration (if applicable): 6000 μ g/plat e

Results remarks: The solvent and positive controls employed in the evaluation of the test
article induced mutant frequency values that were within the acceptable limits of mean historical
data.

CONCLUSIONS

The test article, DETDA

- OBG, Lot #5868

- 1, induced a positive mutational response in all five
Ames/ Salmonella tester strains in the presence of a rat liver derived metabolic activation preparation

. The results s ug gest that it is a metabolite(s) of the test article that is responsible for the mutagenic response to the five tester strains.

STUDY RELIABILITY

[ 1 ] Reliable with out restrictions.

REFERENCES

Barfknecht, T., and Naismith, R. 1986. Ames Salmonella /Microsome Plate Test with DETDA

OBG Lot #58681 (EPA/OECD). Report # PH 301

- ET

- 002

- 86. Sponsor: Ethyl Corporation, Baton Rouge, LA.

Mulholland

, A. 1986. Recent Genetic Toxicology DET D A Results. Inter

- Office Memo. Sponsor: Ethyl Corporation, Baton Rou ge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

37 Study 2 : Mutagenicity stud ies in Salmonella typhimurium ( Barfhecht et al., 1986 )

Title: Ames Salmonella /microsome plate test (EPA/OECD)

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity : 98.9% 3,5

- Diethyltoluene

- 2,6

- diamine, CAS No. 2095

- 01

- 4 ; Synonym: 2,6

- DETDA

Remarks: Referred to as 2,6 DETDA Isomer #2, Lot #5712

- 71

- 6; Pale tan solid; Composition: 98.9% 3,5

- diethyltoluene

- 2,6

- diamine, 0.8% monoethyltoluenediamine, 0.3% other isomers (as cited in Mulholland, 1986)

METHOD

Method/guideline followed: Protocol

- 301 84 EPA/OECD

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1986

Test species: Salmonella typhimurium strains TA1535, TA1537, TA1538, TA98 and TA100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 100, 330, 1000, 3300 and 10,000 μ g /plate (preliminary toxicity screen); 60, 200, 600, 2000 and 6000 μ g/plate (mutation assay)

Statistical methods used: In most tests with the Salmonella /microsome Assay, results are either clearly positive or clearly negative, A positive result is defined as a reproducible, dose

- related
increase in the number of histidine

- independent colonies with at least one dose point i nducing a mutant frequency valve that is two

- fold the solvent control value. Significance at the 95% confidence Limit is determined by the program developed by Moore and Felton (1983). This program applies a linear regression analysis to the data points an d any P value greater than 0.05 is considered significant. In addition, the greater the P value, the higher the probability that the data points fit a linear response. This dose

- response relationship occasionally necessitates slight
modification of the ori ginal doses in a repeat assay. Alternatively, if the solvent control is within
the 95% confidence limits of the historical mean (See Historical Data) for control values and the test chemical produces the highest increase equal to or greater than three time s the solvent control value, the test chemical is considered positive. A negative result is defined as the absence of a reproducible increase in the number of histidine

- independent colonies.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

38 Test method/conditions remarks:

Negative and Positive Controls: Tester strains TA1535, TA1537, TA1538, TA98 and TA100 were plated in triplicate with the appropriate solvent, both with and without metabolic activation, to obtain background lawn and revertant colony formation to serve as n egative solvent controls. In order to validate the integrity of the test system, all tester strains were also run, in triplicate, with known positive response chemicals. P ositive controls not requiring metabolic activation

were strain specific and were as follows:

TA1535

- without activation

- Sodium azide (10 μ g/plate)
TA1537

- without activation

- 9

- aminoacridine (150 μ g/plate)
TA1538

- without activation

- 2

- nitrofluorene (5.0 μ g/plate)
TA98

- without activation

- 2

- nitrofluorene (5.0 μ g/plate)
TA100

- without activation

- Sodium azide (10 μ g/plate)

The positive control requiring metabolic activation was 2

- anthramine (2

- Aminoanthracene) (2.5

μ g/plate) in all strains.

Preliminary Toxicity Screen: The preliminary toxicity screen for the Ames Assay performed without metabolic activation used two of the histidine auxotrophs of Salmonella typhimurium

, TA1538 and TA100. The preliminary toxicity screen was designed to determine at which levels the compound exhibits toxic effects to the Salmonella typhimurium tester strains. The test compound was prepared to a concentration of 100 mg/ml and five different levels tested for toxicity (100, 330, 1000, 3300 and 10,000 μg/plate) . Top agar, used as an overlay, was reconstituted into a molten state and sup plemented with 0.5mM histidine

- 0.5mM biotin at a volume of 0.1 ml/ml of agar, and maintained at 45°C until used. Sterile glass tubes with kaputs were labeled and placed into a Fisher Isotemp R Dry Bath at 45°C. All control and treated tubes and plates w ere done in duplicate. Using sterile technique, the following were added to each tube: 2 ml aliquots of top agar solution, 0.1 ml of tester strain and 0.1 ml of the appropriate concentration of the test compound. The tubes were vortexed and poured onto min imal glucose plates. The sample was evenly distributed on the plate, and the top agar overlay was allowed to harden. The same procedure was repeated for each tester strain. Within an hour the plates were inverted and placed in a dark 37°C incubator. The pl ates were incubated for 48 hours following which the background lawn and spontaneous revertants were observed and scored as normal growth, inhibited growth or no growth. Inhibition was scored by the presence of pindot colonies
and the absence of a conflue nt lawn of bacteria.

Plate Incorporation Assay : Test article, 2,6 DETDA # 2, Lot #5712

- 71

- 6, was evaluated in strains TA1535, TA1537, TA1538, TA98 and TA100 of Salmonella typhimurium with and without metabolic activation preparation at dose Levels of 60, 200, 600, 2000 and 6000 μ g/plate.
There was 0.10 ml of S

- 9 supernatant (44 mg protein per ml) per 1.0 ml of S

- 9 mix in the rat liver metabolic activation preparation.

Top Agar: Top agar, used as an overlay, was reconstituted into a molten state and su pplemented
with 0.5 mM histidine and 0.5 mM biotin at a volume of 0.1 ml per ml of agar, and maintained at 45°C until used. Sterile tubes with kaputs were labeled and placed into a Fisher lsotemp R DryFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

39 Bath at 45°C. All negative and positive control tubes and plates were done in triplicate. A ll compound

- treated tubes and plates were done in triplicate. Using sterile technique, the following were added to each tube in the following order: 2 ml aliquot of top agar solution, 0.1 ml of tester strain, and 0.1 ml of the appropriate concentration of the test compound. The tubes were vortexed and poured onto minimal glucose plates. The sample was evenly distributed on the plate, and the top agar overlay was allowed to harden.

Metabolic Activation System: Tubes requ iring metabolic activation had, in addition to the preceding top agar ingredients, an S

- 9 fraction of rat liver homogenate obtained from Ar o clor
1254

- treated Sprague Dawley rats.

The S

- 9 fraction was thawed on the day of use and kept cold on ice. 0.5 ml o f the S

- 9 mix was added to the tubes which were then vortexed and poured onto minimal glucose plates. The plates were allowed to harden for several minutes. The same procedure was repeated for each tester strain within an hour the plates were inverted and placed in a dark 37°C incubator. The plates
were incubated for 48

- 72 hours, checked for uniform background lawn, and scored by counting revertant colonies on an electronic colony counter interfaced with an Apple computer for data acquisition.

Bacterial Contaminant Control: To insure the quality of aseptic technique during the assay and also the sterility of solvents, compounds and equipment, standard contamination checks were conducted with the assay. These contamination checks included the top level of test substance, solvent, top agar and S

- 9 mix at the same volumes as in the assay, The test substance or S

- 9 mix were added to 2 ml of molten top agar supplemented with 0.5 m M histidine

- 0.5mM biotin and poured onto minimal glucose plates. Top agar alone w as also plated on minimal glucose plates. All plating was done in triplicate. Plates were incubated for 48 hours at 37°C (± 2°C) and then
scored for contamination.

Data Reporting: In scoring the assay, the positive and negative controls were first evalua ted. If the negative control values did not fall within the acceptable historical mean values, the remaining plates were not scored and the assay was repeated.

RESULTS

There were no observed increases in mutation frequencies in strains TA1535, TA1537, TA1538,
TA98 and TA 100 with and without metabolic activation, at dose levels of 60, 200, 600, 2000 and
6000 μ g/plate. The high dose of 6000 μg /plate appeared to be toxic to the five tester strains as evidenced by a reduction in the mean number of r evertant colonies relative to the solvent control
values.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): ≥ 3300 μg/plate

Results remarks: All solvent and positive controls employed in the evaluation of the test article induced mean mutant frequency values, which were within the acceptable range of mean
histo r ical data.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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40 CONCLUSIONS

The test substance was not mutagenic in Salmonella typhimurium strains TA1535, TA1537, TA1538, TA98 or TA 100 with or without metabolic activation.

STUDY RELIABILITY

[ 1 ] Reliable with out restrictions.

REFERENCES

Bar f hecht, T., Naismith, R., and Matthews, R. 1986. Ames Salmonella /Microsome Plate Test with 2,6 DETDA #2 Lot #5712

- 71

- 6 (EPA/OECD). Report # PH 301

- ET

- 003

- 86. Performing Laboratory: Pharmakon Laboratories, Scranton, PA. Sponsor: Ethyl Corporation.

Mulholland

, A. 1986. Recent Genetic Toxicology DET D A Results. Inter

- Office Memo. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

41 Study 3 : Mutagenicity stud ies in Salmonella typhimurium ( Barfknecht et al., 1985 a )

Title: Ames Salmonella /microsome plate test (EPA/OECD)

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA)

Remarks: Referred to as 5711

- 75

- 7 (Orangeburg sample) ; Red orange liquid ; Composition: 2.805% METDA, 76.082% 2,4

- DETDA, 20.480% 2,6

- DETDA, 0.260% 2,4,6

- TETDA, 0.285% trialkylated PDA, 0.089% others (as cited in Mulholland, 1986).

METHOD

Method/guideline followed: Protocol

- 301 84 EPA/OECD

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1985

Test species: Salmonella typhimurium strains TA1538, TA98 and TA100

Metabolic activation: With S

- 9 metabolic activation from rat livers

Concentrations tested: 100, 333, 1000, 3333 and 10,000 μg /plate

Statistical methods used: In most tests with the Salmonella /microsome Assay, results are either clearly positive or clearly negative

. A positive result is defined as a reproducible, dose

- related
increase in the number of histidine

- independent colonies with at least one dose point inducing a mutant frequency valve that is two

- fold the solvent contro l value. Significance at the 95%
confidence l imit is determined by the program developed by Moore and Felton (1983). This program applies a linear regression analysis to the data points and any P value greater than 0.05 is considered significant. In additi on, the greater the P value, the higher the probability that the data points fit a linear response. This dose

- response relationship occasionally necessitates slight modification of the original doses in a repeat assay. Alternatively, if the solvent control is within
the 95% confidence limits of the historical mean (See Historical Data) for control values and the test chemical produces the highest increase equal to or greater than three times the solvent control value, the test chemical is considered positiv e. A negative result is defined as the absence of a reproducible increase in the number of histidine

- independent colonies.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

42 Test method/conditions remarks: Negative and Positive Controls: Tester strains TA1538, TA98 and TA100 were plated in triplicate wi th the appropriate solvent, both with and without metabolic activation, to obtain background lawn and revertant colony formation to serve as negative solvent controls. In order to validate the integrity of the test system, all tester strains were also run with known positive response chemicals, six (6) plates being seeded per point.

The positive control requiring metabolic activation was 2

- anthramine (2

- Aminoanthracene) (2.5

μ g/plate) in all strains.

Plate Incorporation Assay: Test article, 5711

- 75

- 7, was received as a red orange liquid and was dissolved in dimethylsulfox i de (DMSO) at the suggestion of the sponsor. The dose levels
evaluated in the Ames/ Salmonella mutation Assay with tester strains TA1538, TA98 and TA100 in the presence of metabolic acti vation preparation were 100, 333, 1000, 3333 and 10,000

μg /plate. There was 0.08 ml of S

- 9 fraction (35.7 mg protein per ml) per 1.0 ml of rat liver
derived S

- 9 metabolic activation preparation. Plates were scored after approximately 48 hours
and 72 hours of incubation at 37°C ± 2°C.

Top Agar: Top agar, used as an overlay, was reconstituted into a molten state and supplemented
with 0.5 mM histidine and 0.5 mM biotin at a volume of 0.1 ml per ml of agar, and maintained at
45°C until used. Sterile tubes with kaputs were labeled and placed into a Fisher I sotemp R Dry
Bath at 45°C. All negative and positive control tubes and plates were done in triplicate. A ll compound

- treated tubes and plates were done in triplicate. Using sterile technique, the following were added to each tube in the following order: 2 ml aliquot of top agar solution, 0.1 ml of tester strain, and 0.1 ml of the appropriate concentration of th e test compound. The tubes were vortexed and poured onto minimal glucose plates. The sample was evenly distributed on the plate, and the top agar overlay was allowed to harden.

Metabolic Activation System: A S

- 9 fraction of rat liver homogenate obtained f rom Ar o clor
1254

- treated Sprague Dawley rats was employed for all test conditions

.

The S

- 9 fraction was thawed on the day of use and kept cold on ice. 0.5 ml of the S

- 9 mix was added to the tubes which were then vortexed and poured onto minimal glucose p lates. The plates were allowed to harden for several minutes. The same procedure was repeated for each tester strain within an hour the plates were inverted and placed in a dark 37°C incubator. The plates
were incubated for 48

- 72 hours, checked for unifo rm background lawn, and scored by counting revertant colonies on an electronic colony counter interfaced with an Apple computer for data acquisition. Three plates from each set of six were scored at 48 and 72 hours of incubation. The plates were also obse rved for unusual colony morphology.

Bacterial Contaminant Control: To insure the quality of aseptic technique during the assay and also the sterility of solvents, compounds and equipment, standard contamination checks were conducted with the assay. These contamination checks included the top level of test substance, solvent, top agar and S

- 9 mix at the same volumes as in the assay, The test substance or S

- 9 mix were added to 2 ml of molten top agar supplemented wit h 0.5m M histidine

- 0.5mM biotin and

poure d onto minimal glucose plates. Top agar alone was also plated on minimal glucose plates.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

43 All plating was done in triplicate. Plates were incubated for 48 hours at 37°C (± 2°C) and then
scored for contamination.

Data Reporting: In scoring the assay, the positive and negative controls were first evaluated. If the negative control values did not fall within the acceptable historical mean values, the remaining plates were not scored and the assay was repeated.

RE SULTS

The test article induced statistically significant (at the 95% confidence interval) linear mutational dose responses in Ames/ Salmonella tester strains TA1538, TA98 and T A 100 in the presence of metabolic activation preparation over the dose range of 100

- 10,000 μ g/plate at approximately 38
and 72 hours of incubation. The maximum observed fold

- increase over the mean solvent control mutant frequency values which occurred after the 48 hour incubation period for strains TA1538
and TA98 were 5.6 and 3.8 , respectively. A mutant frequency value that reach ed 1.9

- fold the
mean solvent control value for strain TA100 occurred after the 72 hour incubation period. No
unusual colony morphology was observed at either 48 or 72 hours of incubation.

Genotoxicity result: Positive

Cytotoxic concentration (if applicable): N/A

Results remarks: All solvent and positive controls employed in the evaluation of the test article induced mutant frequency values that we re within the acceptable limits of mean historical data except the 72 hour incubation solvent control value for strain TA98. The sponsor requested that the laboratory not repeat strain TA98.

CONCLUSIONS

The test substance was mutagenic in S . typhimurium strains TA1538 and TA98 in the presence
but not the absence of metabolic activation

.

STUDY RELIABILITY

[2] Reliable with restrictions. Important study details were missing from the study

, includ ing information on cytotoxicity of the test substance

.

REFERENCES

Barfknecht, T., Naismith, R., and Matthews, R. 1985 a . Ames Salmonella /Microsome Plate Test:
5711

- 75

- 7 (EPA/OECD). Report # PH 301

- ET

- 010

- 85. Performing Laboratory: Pharmakon Laboratories, Waverly, PA. Sponsor: Ethyl Corporation.

Mulholland

, A. 1986. Recent Genetic Toxicology DET D A Results. Inter

- Office Memo. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

44 Study 4 : Mutagenicity stud ies in Salmonella typhimurium ( Barfknecht et al., 1985 b )

Title: Ames Salmonella /microsome plate test (EPA/OECD)

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: 99.953% 3,5

- Diethyltoluene

- 2,4

- diamine, CAS No. 2095

- 02

- 5 ; Synonym: 2,4

- DETDA

Remarks: Lot No. 5712

- 38

- 7; Clear yellow liquid; Composition: 99.953% 3,5

- diethyltoluene

2,4

- diamine, 0.023% 2,4,6

- triethyltoluenediamine, 0.024% others (as cited in Mulholland, 1986)

.

METHOD

Method/guideline followed: Protocol

- 301 84 EPA/OECD

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1985

Test species: Salmonella typhimurium strains TA1535, TA1537, TA1538, TA98 and TA100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 625, 1250, 2500, 5000 and 7500 μg /plate

Statistical methods used: In most tests with the Salmonella /microsome Assay, results are either clearly positive or clearly negative, A positive result is defined as a reproducible, dose

- related
increase in the number of histidine

- independent colonies with at least one dose point inducing a mutant frequency valve that is two

- fold t he solvent control value. Significance at the 95%
confidence l imit is determined by the program developed by Moore and Felton (1983). This program applies a linear regression analysis to the data points and any P value greater than 0.05 is considered signi ficant. In addition, the greater the P value, the higher the probability that the data points fit a linear response. This dose

- response relationship occasionally necessitates slight modification of the original doses in a repeat assay. Alternatively, if th e solvent control is within
the 95% confidence limits of the historical mean (See Historical Data) for control values and the test chemical produces the highest increase equal to or greater than three times the solvent control value, the test chemical is c onsidered positive. A negative result is defined as the absence of a reproducible increase in the number of histidine

- independent colonies.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

45 Test method/conditions remarks:

Negative and Positive Controls: Tester strains TA1535, TA1537, TA1538, TA98 and TA100 were plated in triplicate with the appropriate solvent, both with and without metabolic activation, to obtain background lawn and revertant colony formation to serve as negative solvent controls. In order to validate the integrity of the test system, all tester strains were also run, in triplicate, with known positive response chemicals. P ositive controls not requiring metabolic activation

were strain specific and were as follows:

TA1535

- without activation

- Sodium azide (10 μ g/plate)
TA1537

- with out activation

- 9

- aminoacridine (150 μ g/plate)
TA1538

- without activation

- 2

- nitrofluorene (5.0 μ g/plate)
TA98

- without activation

- 2

- nitrofluorene (5.0 μ g/plate)
TA100

- without activation

- Sodium azide (10 μ g/plate)

The positive control requiring metabolic activation was 2

- anthramine (2

- Aminoanthracene) (2.5

μ g/plate) in all strains.

Plate Incorporation Assay : Test article, 2,4

- DETDA, Lot # 5712

- 38

- 3, was received as a clear yellow liquid and was dissolved in dimethylsulfoxide (DMSO) at the suggestion of the sponsor. The Preliminary Toxicity Screen was waived by the sponsor. The dose levels selected for the
Plat e Incorporation Mutation Assay in consultation with the sponsor were 625, 1250, 2500, 5000
and 7500 μg /plate.

The test article, 2,4

- DETDA, was evaluated in Ames/ Salmonella tester strains TA1535, TR1537, TA1538, TA98 and TA100 with and without metabolic ac tivation preparation. There was 0.10
ml of S

- 9 supernatant (45 mg protein per ml) per 1.0 ml of S

- 9 mix in the rat liver metabolic activation preparation.

Top Agar: Top agar, used as an overlay, was reconstituted into a molten state and supplemented
with 0.5 mM histidine and 0.5 mM biotin at a volume of 0.1 ml per ml of agar, and maintained at 45°C until used. Sterile tubes with kaputs were labeled and placed into a Fisher lsotemp R Dry
Bath at 45°C. All negative and positive control tubes and plates were done in triplicate. A ll compound

- treated tubes and plates were done in triplicate. Using sterile technique, the following were added to each tube in the following order: 2 ml aliquot of top agar solution, 0.1 ml of tester strain, and 0.1 ml of the appropriate concentration of the test compound. The tubes were vortexed and poured onto minimal glucose plates. The sample was evenly distributed on the plate, and the top agar overlay was allowed to harden.

Metabolic Activation System: Tubes requirin g metabolic activation had, in addition to the preceding top agar ingredients, an S

- 9 fraction of rat liver homogenate obtained from Ar o clor
1254

- treated Sprague Dawley rats.

The S

- 9 fraction was thawed on the day of use and kept cold on ice. 0.5 ml of th e S

- 9 mix was added to the tubes which were then vortexed and poured onto minimal glucose plates. The plates were allowed to harden for several minutes. The same procedure was repeated for each testerFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

46 strain within an hour the plates were inverted and plac ed in a dark 37°C incubator. The plates
were incubated for 48

- 72 hours, checked for uniform background lawn, and scored by counting revertant colonies on an electronic colony counter interfaced with an Apple computer for data acquisition.

Bacterial Cont aminant Control: To insure the quality of aseptic technique during the assay and also the sterility of solvents, compounds and equipment, standard contamination checks were conducted with the assay. These contamination checks included the top level of test substance, solvent, top agar and S

- 9 mix at the same volumes as in the assay, The test substance or S

- 9 mix were added to 2 ml of molten top agar supplemented with 0.5nM histidine

- 0.5mM biotin and poured onto minimal glucose plates. Top agar alone was a lso plated on minimal glucose plates. All plating was done in triplicate. Plates were incubated for 48 hours at 37°C (± 2°C) and then
scored for contamination.

Data Reporting: In scoring the assay, the positive and negative controls were first evaluated. If the negative control values did not fall within the acceptable historical mean values, the remaining plates were not scored and the assay was repeated.

RESULTS

Test article, 2,4

- DETDA, Lot # 5712

- 38

- 7, did not induce a mutational dose response in
Ames/ Salmonella tester strains TA 1 535, TA1537, TA 1 538, TA98 and TA 100 with and without metabolic activation preparation over the dose range of 625

- 7500 μg /plate.

Mutant frequency values that were 2

- fold the mean solvent control value s were observed f o r strain TA 100 with metabolic activation p r eparation at dose levels of 625 and 1250 μg /plate. However, due to insufficient test article this observation or the occurrence of a dose response at lower concentrations could not be confirmed.

Genotoxicity result: Equivocal

Cytotoxic concentration (if applicable): N/A

Results remarks: All solvent and positive controls employed in the evaluation of the test article
induced mutant frequency values that were within the acceptable range of mean historical values.

CONCLUSIONS

The test substance did not induce a mutational dose response in Salmonella strains TA1535,
TAl 5 37, TA1538, TA98 or TA100 with or without metabolic activation. Mutant frequency
values that were 2

- fold the mean solvent control value s were observed f o r strain TA 100 with
metabolic activation p r eparation at dose levels of 625 and 1250 μg /plate. However, due to insufficient test article this observation or the occurrence of a dose response at lower
concentrations could not be con firmed.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

47 STUDY RELIABILITY

[2] Reliable with restrictions. Important study details were missing from the study and included

c ytotoxicity of the test substance.

REFERENCES

Barfknecht, T., Naismith, R., and Matthews, R. 1985 b . Ames Salmonella /Microsome Plate Test with 2,4 DETDA Lot #5712

- 38

- 7 (EPA/OECD). Report # PH 301

- ET

- 0 13

- 85. Performing Laboratory: Pharmakon Laboratories, Scranton, PA. Sponsor: Ethyl Corporation.

Mulholland

, A. 1986. Recent Genetic Toxicology DE T D A Results. Inter

- Office Memo. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

48 Study 5 : Mutagenicity stud ies in Salmonella typhimurium ( Barfknecht et al., 1985 c )

Title: Ames Salmonella /microsome plate test (EPA/OECD)

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: 99.51% 3,5

- Diethyltoluene

- 2,6

- diamine, CAS No. 2095

- 01

- 4 ; Synonym: 2,6

- DETDA

Remarks: Lot No. 5712

- 53

- 73 ; Light brown solid; Composition: 99.51% 3,5

- diethyltoluene

2,6

- diamine, 0.49% other trialkylates (as cited in Mulholland, 1986)

.

METHOD

Method/guideline followed: Protocol

- 301 84 (EPA/OECD)

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1985

Test species: Salmonella typhimurium strains TA1535, TA1537, TA1538, TA98 and TA100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 625, 1250, 2500, 5000 and 7500 μg /plate

Statistical methods used: In most tests with the Salmonella /microsome Assay, results are either clearly positive or clearly negative, A positive result is defined as a reproducible, dose

- related
increase in the number of histidine

- independent colonies with at least one dose point inducing a mutant frequency valve that is two

- fold t he solvent control value. Significance at the 95% confidence Limit is determined by the program developed by Moore and Felton (1983). This program applies a linear regression analysis to the data points and any P value greater than 0.05 is considered signi ficant. In addition, the greater the P value, the higher the probability that the data points fit a linear response. This dose

- response relationship occasionally necessitates slight modification of the original doses in a repeat assay. Alternatively, if th e solvent control is within
the 95% confidence limits of the historical mean (See Historical Data) for control values and the test chemical produces the highest increase equal to or greater than three times the solvent control value, the test chemical is c onsidered positive. A negative result is defined as the absence of a reproducible increase in the number of histidine

- independent colonies.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

49 Test method/conditions remarks:

Negative and Positive Controls: Tester strains TA1535, TA1537, TA1538, TA98 and TA100 were plated in triplicate with the appropriate solvent, both with and without metabolic activation, to obtain background lawn and revertant colony formation to serve as negative solvent controls. In order to validate the integrity of the test system, all tester strains were also run, in triplicate, with known positive response chemicals. P ositive controls not requiring metabolic activation

were strain specific and were as follows:

TA1535

- without activation

- Sodium azide (10 μ g/plate)
TA1537

- with out activation

- 9

- aminoacridine (150 μ g/plate)
TA1538

- without activation

- 2

- nitrofluorene (5.0 μ g/plate)
TA98

- without activation

- 2

- nitrofluorene (5.0 μ g/plate)
TA100

- without activation

- Sodium azide (10 μ g/plate)

The positive control requiring metabolic activation was 2

- anthramine (2

- Aminoanthracene) (2.5

μ g/plate) in all strains.

Plate Incorporation Assay: Test article, 2,6

- DETDA, Lot # 5712

- 53

- 73, was received as a light brown solid and was dissolved in dimethylsulfoxide (DMSO) at the suggest ion of the sponsor. The Preliminary Toxicity Screen was waived by the sponsor. The dose levels selected for the Plate Incorporation Mutation Assay in consultation with the sponsor were 625, 1250, 2500, 5000
and 7500 μg /plate.

The test article, 2,6

- DETDA, was evaluated in Ames/ Salmonella tester strains TA1535, T A 1537, TA1538, TA98 and TA100 with and without metabolic activation preparation. There was 0.10
ml of S

- 9 supernatant (45 mg protein per ml) per 1.0 ml of S

- 9 mix in the rat liver metabolic
activatio n preparation.

Top Agar: Top agar, used as an overlay, was reconstituted into a molten state and supplemented
with 0.5 mM histidine and 0.5 mM biotin at a volume of 0.1 ml per ml of agar, and maintained at 45°C until used. Sterile tubes with kaputs were l abeled and placed into a Fisher lsotemp R Dry
Bath at 45°C. All negative and positive control tubes and plates were done in triplicate. A ll compound

- treated tubes and plates were done in triplicate. Using sterile technique, the following were added to each tube in the following order: 2 ml aliquot of top agar solution, 0.1 ml of tester strain, and 0.1 ml of the appropriate concentration of th e test compound. The tubes were vortexed and poured onto minimal glucose plates. The sample was evenly distributed on the plate, and the top agar overlay was allowed to harden.

Metabolic Activation System: Tubes requiring metabolic activation had, in addi tion to the preceding top agar ingredients, an S

- 9 fraction of rat liver homogenate obtained from Ar o clor
1254

- treated Sprague Dawley rats.

The S

- 9 fraction was thawed on the day of use and kept cold on ice. 0.5 ml of the S

- 9 mix was
added to the tubes wh ich were then vortexed and poured onto minimal glucose plates. The plates were allowed to harden for several minutes. The same procedure was repeated for each testerFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

50 strain within an hour the plates were inverted and placed in a dark 37°C incubator. The pl ates were incubated for 48

- 72 hours, checked for uniform background lawn, and scored by counting revertant colonies on an electronic colony counter interfaced with an Apple computer for data acquisition.

Bacterial Contaminant Control: To insure the qual ity of aseptic technique during the assay and also the sterility of solvents, compounds and equipment, standard contamination checks were conducted with the assay. These contamination checks included the top level of test substance, solvent, top agar and S

- 9 mix at the same volumes as in the assay, The test substance or S

- 9 mix were added to 2 ml of molten top agar supplemented with 0.5nM histidine

- 0.5mM biotin and poured onto minimal glucose plates. Top agar alone was also plated on minimal glucose plate s. All plating was done in triplicate. Plates were incubated for 48 hours at 37°C (± 2°C) and then
scored for contamination.

Data Reporting: In scoring the assay, the positive and negative controls were first evaluated. If the negative control values di d not fall within the acceptable historical mean values, the remaining plates were not scored and the assay was repeated.

RESULTS

No increases in mutant frequency were observed in Ames/ Salmonella test strains TA1535, TA1537, TA 1 538, TA98 and TA 100 without metabolic activation preparation over the dose range of 625

- 7500 μg /plate. Results were also negative fo r s t rain TA1535 with metabolic
activation preparation o ver the same dose range. Statistically significant (at the 95 % confidence interval) line ar mutational dose responses were observed for strains TA1537, T A 1538 and TA98 in the presence of metabolic activation o ver the dose range of 625

- 7500 μ g/plate. A non

- linear dose response was observed for strain TA 100 with metabolic activation preparation over the

same dose range. Maximum observed fold increases over mean solvent control mutant frequency
values were as follows: TA 1 537 (7.2)

, TA1538 ( 33 ), TA98 (18.9) and TA1 00 (7.2)

. Due to
insufficient test article these positive responses could not be confirmed.

Genotoxicity result: Positive with metabolic activation

Cytotoxic concentration (if applicable): N/A

Results remarks: All solvent and positive controls employed in the evaluation of the test article
induced mutant frequency values that were within the acceptab le range of mean historical data.

CONCLUSIONS

The test substance was mutagenic in S. typhimurium strains TA15 37, TA1538, TA98 and TA 100 in the presence but not the absence of metabolic activation.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

51 STUDY RELIABILITY

[2] Reliable with restrictions. Important study details were missing from the study and included cytotoxicity of the test substance.

REFERENCES

Barfknecht, T., Naismith, R., and Matthews, R. 1985 c . Ames Salmonella /Microsome Plate Test with 2,6 DETDA Lot #5712

- 53

- 73 (EPA/OECD). Report # PH 301

- ET

- 014

- 85. Performing Laboratory: Pharmakon Laboratories, Scranton, PA. Sponsor: Ethyl Corporation.

Mulholland

, A. 1986. Recent Genetic Toxicology DET D A Results. Inter

- Of fice Memo. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

52 Study 6 : Mutagenicity stud ies in Salmonella typhimurium ( Stewart and Riccio, 1985 )

Title: In vitro microbiological mutagenicity assays of Ethacure 100/salicylic acid

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA) ; Purity not specified

Remarks: Ethacure 100/salicylic acid mixture (22:1); Brown, viscous liquid; Lot No.: Ethacure 100:336, Salicylic acid: MCB, CB664.

METHOD

Method/guideline followed: Not indicated

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Not indicated

Year study performed: 1985

Test species: Salmonella typhimurium strains TA1535, TA1537, TA1538, TA98 and TA100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 0 (DMSO solvent control), 10, 50, 100, 500, 1000 and 5000 μ g/plate

Statistical methods used: No statistical analysis performed. Results are a tabulation of the number of colonies appearing on the plates.

Test method/conditions remarks: At the request of Sandia National laboratories, SRI International examined an Ethacure 100/salicylic acid mi xture (22:1) for mutagenic activity in
the Ames Salmonella /microsome assay. The assays were conducted with Salmonella typhimurium tester strains TA1535, TA1537, TA1538, TA98, and TA100, both in the presence
and absence of an Aroclor 1254

- induced rat

- liver metabolic activation system. Dimethylsulfoxide (DMSO) was used as the diluent.

After consultation with the client, the preliminary (range

- finding) Assay was waived because this sample i s similar to samples assayed previously. The first assay of this mix ture wa s conducted at dose levels used in the previous work: 10, 50, 100, 500, 1000, and 5000 μ g/plate.

Metabolic Activation: Aroclor 1254

- induced, rat

- liver S

- 9; SRI Batch F

- 6; ~ 31.9 mg/ml protein; Animal Supplier: Simonsen Laboratories, Gilroy, CAFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

53 Negative (Diluent) Control Material: Dimethylsulfoxide (DMSO)

Positive Control Chemicals: 9

- Aminoacridine, 2

- Anthramine, 2

- Nitrofluorene and Sodium Azide

Criteria for Interpretation : Positive: A test article i s considered a mutagen when it produces a rep roducible, dose

- related
increase in the number of revertants in one or more s t r ains. This increase should occur for at least
three dose levels.

Negative: A test article is considered a no n mutagen when no dose

- related i ncrease in the number of revertants is observed in at least two independent experiments. The maximum dose level
tested for nontoxic compounds is 10 mg/plate (unless dictated otherwise by the Sponsor or by solubility problems)

. For toxic compounds, only the highest dose level tested should show evidence of toxicity.

In conclusive: When a test article cannot be identified clearly as a mutagen or nonmutagen in the standard plate assay, the results are classified as inconclusive.

RESULTS

The results of this assay showed significant increases in the number of hi s + revertant colonies with strains TA1538, TA98, and TA 100 in the presence of metabolic activation. Because these
increases occurred in and/or near dose level s that exhibited toxicity, colonies were replicated or restreaked onto minimal plates lacking histidine, but supplemented with biotin, to check for their
his + characteristics. These colonies w ere found to be true revertants and not artifacts due to toxicity

. Slightly increased numbers of revertants were also seen in this as say with TA1537 in the presence of metabolic activation. Toxicity indicated by a decrea s e in the number of revertants
wi th or without c o ncurrent thinning of the background growth lam

- was seen at the highest dose
level w ith several of the tester strains.

The s econd assay of the Ethacur e 100 /salicylic acid mi xture without metabolic activation was
conducted at the same dose levels as in the first as s a y. The dose levels used in the presence of
metabolic activation were sli ghtly higher (except for TA100) and covered a narrower range, as

necessary to define a better dose response. Again, no mutagenic activity was seen in the absence of metabolic activation, and toxicity was seen with several of the tester strains at the highest one
or two dose levels. Significant, clearly dose

- related i ncreases in the number of revertant colonies occurred with strains TA1538, TA98, and TA100, but not with strain TA1537. Because the previously increased values se en with TA1537 were so slight and not r eproduc i ble, we attributed
them to random fluctuations in the number of spo ntaneou s rever t ants and not to mutagenic activity.

Genotoxicity result: Positive

Cytotoxic concentration (if applicable): 5000 μg/plateFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

54 Results remarks: Positive and negative (diluent) control values were within acceptable limits for all assays.

CONCLUSIONS

Ethacure 100/salicylic acid mixture (22:1) was mutagenic in S. typhimurium strains TA1538, TA98 and TA100 in the presence but not the absence of metabolic activation. The test substance as not mutagenic in S. typhimurium strains TA1535 or TA1537 with or without metabolic
activation.

STUDY RELIABILITY

[2] Reliable with restrictions. Important study deta ils were missing from the study provided and included purity and composition of the test substances, GLP compliance and test method/guidelines followed.

REFERENCES

Stewart, K., and Riccio, E. 1985. In Vitro Microbiologi cal Mutagenicity Assays of Ethacure 100/Salicylic Acid. Performing Laboratory: SRI International, Menlo Park, CA. Sponsor:
Sandia National Laboratories.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

55 Study 7 : Mutagenicity stud ies in Salmonella typhimurium ( Johnson and Pettigrew, 1987 a )

Title: Salmonella / microsomal a ssay with DETDA (Lot #5868

- 1)

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: Clear brown liquid; Lot #5868

- 1

.

METHOD

Method/guideline followed: Protocol

- Ettox 027

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1987

Test species: Salmonella typhimurium strains TA1535, TA1537, TA98 and TA100

Metabolic activation: With S

- 9 metabolic activation from rat livers

Concentrations tested: 0 (untreated control), 0 (DMSO solvent control), 10, 37.5, 75, 100 and 125 mg/mL

Statistical methods used: Not indicated

Test method/conditions remarks: Salmonella typhimurium strains TAl535, TA1537, TA98 and TA100 were treated in the presence of metabolic activation (Aroclor 1254 induced rat liver
S

- 9 fraction) with DETDA in DMSO. Dose levels tested were 125, 100, 75, 37.5, and 10 mg/mL.
DETDA was solubl e at all dose levels tested. Each dose was treated in triplicate. An untreated control, solvent control and positive control were treated concurrently.

RESULTS

125 mg/ m L demonstrated toxicity in all strains tested with metabolic activation. DETDA caused

a dose related increase in mutant colonies in strains TAl535, TA1537, TA98, and TA100 in the

presence of metabolic activation.

Genotoxicity result: PositiveFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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56 Cytotoxic concentration (if applicable): 125 mg/mL in all strains tested with metabolic
activation

Results remarks: Color and appearance of the test article did not change from the time of receipt to the time of use.

CONCLUSIONS

DETDA was genetically active in the Salmonella / Microsomal Assay according to Protocol

- Ettox 027.

STUDY RELIABILITY

[2] Reliable with restrictions. Important study details were missing from the study summary provided and included purity and composition of the test substance and statistical methods used.

REFERENCES

Johnson, D., and Pettigrew, A. 1987 a

. Genetic toxicology

. Salmonella /M icrosomal Assay with DETDA (Lot # 5868

- 1 ). Ames 101

- # 099

. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

57 Study 8 : Mutagenicity stud ies in Salmonella typhimurium ( Jagannath and Brusick, 1977 )

Title: Mutagenicity e valuation of DE D TA ( diethyltoluenediamine)

- final r eport

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA ); Purity not specified

Remarks: Dark amber liquid , referred to as “DETA”, identified as “diethyltoluenediamine”.

METHOD

Method/guideline followed: Not indicated

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Not indicated

Year study performed: 1977

Test species: Salmonella typhimurium strains TA1535, TA1537, TA1538, TA98 and TA100 and Saccharomyces cerevisiae strain D4

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from
adult human male livers )

Concentrations tested: 0 (DMSO solvent control), 0.001, 0.01, 0.1, 1 and 5 μl/plate

Statistical me thods used: Not indicated

Test method/conditions remarks: The test compound was examined for mutagenic activity in a series of in vitro microbial assays empl oyi ng Salmonella and Saccharomyces indicator organisms. The compound was tested directly and in the presence of liver microsomal enzyme preparations from human liver.

Positive controls in the non

- activation assay were methylnitrosoguanidine (MNNG) for strains TA1535, TA100 and D4 (10 μg/p late), 2

- nitrofluorene (NF) for strains TA1538 and TA98 (100 μg/plate) and quinacrine mustard (QM) for strain TA1537 (10 μg/plate). Positive controls in the activation assay were 2

- anthramine (ANTH) for strains TA1535 and TA100 (100 μg/plate), 2

- acetylami nofluorene (AAF) for strains TA1538 and TA98 (100 μg/plate) and 8

- aminoquinoline (AMQ) for strain TA1537 (100 μg/plate).

Either deionized water or dimethylsulfoxide (DMSO) was used to prepare stock solutions of
solid materials. All dilutions of the test materials were made in either deionized water or DMSO.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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58 Plate Test (Overlay Method): Approximately 10 8 cells from an overnight culture of each indicator strain were added to separate test tubes containing 2.0 ml of molten agar supplemented
with biotin and a trace of histidine. For nonactivation tests, at least four dose levels of the test compound were adde d to the contents of the appropriate tubes and poured over the surfaces of selective agar plates. In activation tests, a minimum of four differen t concentrations o f the test chemical were added to the appropriate tubes with cells. Just prior to pouring, a n aliquot of reaction mixture (0.5 m l containing the 9,000 x g liver homogenate) was added t o each of the activation overlay tubes, which were then mixed, and the contents poured over the surface o f a minimal agar plate and allowed to solidify. The plates were incubated for 48 hours at 37°C, and
scored fo r the number of colonies growing on each plate. Positive and solvent controls using
both directly active positive chemicals and those that require metabolic activation were run with each assay.

The number s of colonies on each plate were counted and recorded on printed forms. These raw data were analyzed in a computer program and reported on a printout. The results are presented as revertants per plate for each indicator strain employed in the assay. The p ositive and the solvent controls are provided as reference points. Other relevant data are provi ded on the computer printout.

RESULTS

The compound was tested over a series of c o ncentrations such that there was either quantitative

or quali tative evidence o f some chemically

- induced physiological effects at the high dose level.
The low dose in all cases was below a concentrat ion that demonstrated any toxic effect. The dose

range employed for the evaluation of t h is compound was from 0.00 1 μl t o 5 μl per plate. The compound was slightly toxic to the strain TA

- 1535 and TA

- 1 537 a t 5 μl per pt ate.

The results of the tests conducted on the compound i n the p resence and absence of the human liver activation system were all negative.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): 5 μl/plate for TA1535 and TA1537

Results remarks: None indicated

CONCLUSIONS

The test compound, DET D A, did not demonstrate mutagenic activity in any of the assays conducted in this evaluation and was considered as not mutagenic under these test conditions.

STUDY RELIABILITY

[2] Reliable with restrictions. Important study details were missing from the study summary provided and included purity and composition of the test substances , GLP compliance, test method/guidelines followed and statistical methods used.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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59 REFERENCES

Jagannath, D., and Brusick, D. 1977. Mutagenicity Evaluation of DETA (Diethyltoluenediamine) Final Report. Performing Laboratory: Litton Bionetics, Kensington,
M D. Sponsor: Ethyl Corporation.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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60 Study 9 : Mutagenicity stud ies in Salmonella typhimurium ( Barfknecht et al., 1985 d

)

Title: Ames Salmonella / m icrosome p late t est (EPA/OECD)

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA)

Remarks: Lot # 5711

- 75

- 1 (Orangeburg sample); L ight brown liquid; Composition: 0.962% METDA, 78.228% 2,4

- DETDA, 19.740% 2,6

- DETDA, 0.251% 2,4,6

- TETDA, 0.595% trialkylated PDA, 0.225% other (as cite d in Mulholland, 1986)

.

METHOD

Method/guideline followed: Not indicated

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1985

Test species: Salmonella typhimurium strains TA1538, TA98 and TA100

Metabolic activation: With S

- 9 metabolic activation from rat livers

Concentrations tested: 100, 333, 1000, 3333 and 10,000 μg/pla t e

Statistical methods used: In most tests with the Salmonella /microsome Assay, results are either clearly positive or clearly negative, A positive result is defined as a reproducible, dose

- related
increase in the number of histidine

- independent colonies with at least one dose point inducing a mutant frequency valve that is two

- fold t he solvent control value. Significance at the 95% confidence Limit is determined by the program developed by Moore and Felton (1983). This program applies a linear regression analysis to the data points and any P value greater than 0.05 is considered signi ficant. In addition, the greater the P value, the higher the probability that the data points fit a linear response. This dose

- response relationship occasionally necessitates slight modification of the original doses in a repeat assay. Alternatively, if th e solvent control is within
the 95% confidence limits of the historical mean (See Historical Data) for control values and the test chemical produces the highest increase equal to or greater than three times the solvent control value, the test chemical is c onsidered positive. A negative result is defined as the absence of a reproducible increase in the number of histidine

- independent colonies.

Test method/conditions remarks: Test article, 5711

- 75

- 1, was received as a light brown liquid and was dissolved in dimethylsulfoxide (DMSO) at the suggestion of the sponsor. TheFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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61 dose levels evaluated in the A mes/ Salmonella Mutation Assay with tester strains TA1538, TA98 and TA100 in the presence of metabolic activation preparation were 100, 333, 1000, 3333 and 10,000 μg/plate. There was 0.00 ml of S

- 9 supernatant (35.7 mg protein per ml) per 1.0 ml of rat liver metabolic activation preparation. Plates were scored after approximately 48 hours and 72
hours of incubation at 37°C ± 2°C.

Tester strains TA15 38, TA98 and TA100 were plated in triplicate with the appropriate solvent,
with metabolic activation, to obtain background lawn and revertant colony formation to serve as negative solvent controls. In order to validate the integrity of the test system, all tester strains

were also run with known positive response chemicals, six (6) plates being seeded per point.

The positive control requiring metabolic activation was 2

- anthramine (2

- Aminoanthracene) (2.5

μ g/plate) in all strains.

Top Agar: Top agar, used as an overlay, was reconstituted into a molten state and supplemented
with 0.5 mM histidine and 0.5 mM biotin at a volume of 0.1 ml per ml of agar, and maintained at 45°C until used. Sterile tubes with kaputs were labeled and placed into a Fisher lsotemp R Dry
Bath at 45°C. All negative and positive control tubes and plates were done in triplicate. A ll compound

- treated tubes and plates were done in triplicate. Using sterile technique, the following were added to each tube in the following order: 2 ml aliqu ot of top agar solution, 0.1 ml of tester strain, and 0.1 ml of the appropriate concentration of the test compound. The tubes were vortexed and poured onto minimal glucose plates. The sample was evenly distributed on the plate, and the top agar overlay was allowed to harden.

Metabolic Activation System: Tubes requiring metabolic activation had, in addition to the preceding top agar ingredients, an S

- 9 fraction of rat liver homogenate obtained from Ar o clor
1254

- treated Sprague Dawley rats.

The S

- 9 fraction was thawed on the day of use and kept cold on ice. 0.5 ml of the S

- 9 mix was added to the tubes which were then vortexed and poured onto minimal glucose plates. The plates were allowed to harden for several minutes. The same procedure was repeated for eac h tester strain within an hour the plates were inverted and placed in a dark 37°C incubator. The plates
were incubated for 48

- 72 hours, checked for uniform background lawn, and scored by counting revertant colonies on an electronic colony counter interfa ced with an Apple computer for data acquisition.

Bacterial Contaminant Control: To insure the quality of aseptic technique during the assay and also the sterility of solvents, compounds and equipment, standard contamination checks were conducted with the assay. These contamination checks included the top level of test substance, solvent, top agar and S

- 9 mix at the same volumes as in the assay, The test substance or S

- 9 mix were added to 2 ml of molten top agar supplemented with 0.5 m M histidine

- 0.5mM biotin and poured onto minimal glucose plates. Top ag ar alone was also plated on minimal glucose plates. All plating was done in triplicate. Plates were incubated for 48 hours at 37°C (± 2°C) and then
scored for contamination.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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62 Data Reporting: In scoring the assay, the positive and negative controls were fir st evaluated. If the negative control values did not fall within the acceptable historical mean values, the remaining plates were not scored and the assay was repeated.

RESULTS

The results fo r test article 5711

- 75

- 1 were positive in Ames / Salmonella tester strains T A 1538,
TA98 and TA10 0 with metabolic activation preparation over the dose range of 100

- 10,000

μ g/plate. These findings are based on the observation of reproducible, statistically significant,
linear mutational dose responses after 48 and 72 hours of incubation. I n addition, maximum fold increase mutant frequency values which were observed a t the 48 hour incubation period were 19.7, 22. 8 and 3.4 for strains TA1538, TA98 and TA100, respectively.

Genotoxicity result: Positive

Cytotoxic concentration (if applicable): Not indicated

Results remarks: All solvent and positive controls employed in the evaluation of the test article induced mutant frequency values that were within the acceptable range of mean historical data except the solvent control value for strain TA98 was outside of the acceptable limits a fter the 72
ho u r incubation peri o d. The sponsor reques ted t hat the laboratory not repeat strain TA98.

CONCLUSIONS

Test article, 5711

- 75

- 1, induced a positive mutational response in Ames \ Salmonella tester strains TA1538, TA98 and TA100 in the presence of metabolic activation preparation over the dose range of 100

- 10,000 μ g/plate under the conditions employed for the study. The data suggest that
the test article induces frame shift and base

- pair change mutational events in the
Ames/ Salmonella tester strains.

STUDY RELIABILITY

[2] Reliable with restrictions. Important study details were missing from the study summary provided and included test method/guidelines followed and cytotoxicity of test substance.

REFERENCES

Barfknecht, T., Naismith, R., and Matthews, R. 1985 d . Ames Salmonella /Microsome Plate Test:
5711

- 75

- 1 (EPA/OECD). Report # PH 301

- ET

- 009

- 85. Performing Laboratory: Pharmakon Research International, Waverly, PA.

Mulholland

, A. 1986. Recent Genetic Toxicology DET D A Results. Inter

- Office Memo. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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63 Study 10 : Mutagenicity stud ies in Salmonella typhimurium ( Stankowski and Naismith,
1987 a )

Title: Ames/ Salmonella Plate Incorporation Assay with DETDA Samples 544

- dist, 663,692,
705 and 722

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: DETDA Samples 544

- dist, 663,692, 705

, 722 and Lot #565

- 8 ; dark red (544

- dist, 663, 692 and 705) or yellow/amber (722) liquids

.

METHOD

Method/guideline followed: Protocol

- 301

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1987

Test species: Salmonella typhimurium strains TA1538, TA98 and TA100

Metabolic activation: With S

- 9 metabolic activation from rat livers

Concentrations tested:

Assay 1: 1000, 3750, 7500, 10,000 and 12,500 μ g/plate Assay 2: 500, 1000, 3750, 7500, 10,000 and 12,500 μ g/plate Assay 3: 100, 250, 500, 1000, 2500, 3750 and 5000 μ g/plate

Statistical methods used: A positive result is defined as a reproducible, statistically significant

two

- fold dose

- dependent increase in the number of histidine

- independent colonies, with at least one dose point inducing an average revertant frequency that is two

- fold that of the so lvent control. Significance is determined using the program developed by Snee and Irr (1981). This program applies a linear regression analysis to the data points and any p value less than 0.05 is considered significant. Alternatively, if the test article produces an increase greater than or equal to three times the solvent control value (in the absence of a dose

- dependent increase), the test chemical is considered positive. A negative result is defined as the absence of a dose

- dependent

two

- fold increase i n the number of histidine

- independent revertants (or three

- fold increase in the absence of any dose

- dependency)

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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64 Test method/conditions remarks: Five D ETDA samples (Lot #s 544

- dist, 663, 692, 705 and 722) were evaluated in the Ames/ Salmonella Plate Incorp oration Assay to determine their ability
to induce reverse mutations at selected histidine loci in three tester strains of Salmonella typhimurium in the presence of an exogenous metabolic activation system (S9 ). The five samples were evaluated in triplicate cultures in s trains TA1538, TA98 and T A100 i n the presence of S9 at doses of 1000, 3750, 7500, 10,000 and 12,500 μ g/plate. These doses were selected by the sponsor based upon results for other DETDA samples previously evaluated. In addition, a s ixth DETD A sample (Lot #565

- 8) was also evaluated concurrently as a positive control at a single dose of 7500 μ g / plate with S9. The S9 mixture included 6% (v/v) Aroclor
1254

- induced male Sprag ue

- Dawley rat liver homogenate with the appropriate buffer and

c ofactors.

Salmonella which have undergone reversion to his + form colonies in the absence of histidine. In contrast, his - Salmonella can only undergo a limited number of doublings (due to the histidine supplement in the top agar) and form the typical background lawn. Following incubation for 48 hours, revertant colonies are enumerated with an automated colony counter

. A ll mutation assays are performed in triplicate cultures in all three tester strains for each test article dose, as well as positive a nd solvent centrals. A ll five DETDA samples were evaluated at doses of 1000, 3750, 7500, l0,000 and 12,500 μ g/plate i n the presence of S9. However, toxicity was observed for all
five DETDA samples in all three strains at doses of 7500, 10,000 and/or 12,50 0 μg /plate. In addition, approximately 1.6

- to 3.3

- fold increases in r evertant frequencies were observed for the

t est samples in strain TA100. Therefore, all five samples were re

- evaluated in all three strains at doses of 500, 1000, 37 50, 7500, 10,000 and 12,500 μ g/plate with S 9, DETDA sample 544

- dist

was subsequently re

- evaluated in a third assay i n all three strains at doses of 100, 250, 500, 1000, 2500, 3750 and 5000 μ g/plate with S9.

Treatment with Test and Control Articles: Tre atments were performed by combining 2 ml top agar (supplemented with 0.5mM histidine/0.5mM biotin), 0.1 ml tester strain, 0.5 ml of the S9 mixture and 0.1 ml test or control article or solvent in sterile glass tubes preheated to 4 5° C. The
S9 mixture conta ined 8mM MgCl 2 , 33mM KC1, 4mM NADP, 5mM glucose

- 6

- phosphate,
100mM NaH 2 PO 4 (pH 7.4) and 6% (v/v) Aroclor 1254

- induced male Sprague

- Dawley rat liver homogenate. The tubes were vortexed end the mixture was poured onto minimal glucose plates, evenly distribu ted, and allowed to solidify. Within an hour the plates were inverted and
incubated in the dark at 37°C for 48 hours.

Bacterial Contaminant Evaluation: To ensure the sterility of solvents, compounds and equipment, standard contamination e valuations were p erformed with the assay. The solvent, top

agar, S 9 mix, and top dose of the test article were evaluated at the same volumes used in the assay. The test article, solvent and S9 mix were evaluated as in the mutation assay, but in the
absence of added Salmone lla

. Top agar alone was also plated on minimal glucose plates. A ll plating was done in triplicate. Plates were incubated for 48 hours at 37°C and then scored for bacterial growth.

Scoring: Following the 48

- hour incubation, the background l awn and spontaneous revertants were scored for normal, inhibited or no growth. Inhibited growth was characterized by the
absence of a confluent bacterial lawn and/or the presence of pindot colonies. Revertant coloniesFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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65 were enumerated on an Artek electronic colony counter interfaced with an Apple computer for
data acquisition. Solvent and positive controls were scored first, and test article treated cultures were scored only if the average negative control values were within historical ranges

.

RESULTS

Revertant frequencies for all doses of all five samples in strains TA1538 and TA98 approximated

or were l ess than those observed in the concurrent negative control cultures. In contrast, statistically significant increases in revertant frequencies of approximately 1.6

- to 3.3

- fold background were observed for samples 544

- dist, 663, 692, 705 and 722 in strain TA100 (p< 0.05). The maximal increases observed were generally limited to the range of 1000

- 7530

μ g/plate; higher doses produced l ower revertant frequencies due to toxicity.

Therefore, all five DETDA samples were re

- evaluated at doses of 500, 1000, 3750, 7500, 10,000 and 12,500 μ g/plate with S9. Inhibited growth was again observed for all five samples in all strains at doses of 7500, 10,000 and/or 12,500 μ g/plat e. Revertant frequencies for all doses of
D ETDA 544

- dist, 663, 692, 705 and 722 in strains TA1538 and TA98 approximated or were less than those of the concurrent negative control cultures. However, s tatistically significant increases
i n revertant frequenci es of approximately 1.3

- , 1.8

- , 1.6

- , 1.7

- and 1.7

- fold control val u es were again observed in strain TA 100 for samples 544

- dist, 663, 692, 705 and 722, respectively (p<
0 .05) . In addition, these increases appeared to be dose

- dependent over the range of 500

- 3750

μ g/plate for samples 663, 692, 705 and 722. DETDA

- 544 (dist) was re

- evaluated in a third assay in all three strains at doses of 100, 250, 500, 1000, 2500, 3750 and 5000 μ g/plate with S9. In this final assay, a statistically significant in crease in revertant frequency, equal to 1.3

– fold background, was observed in strain TA100 only at a dose of 500 μg/plate.

Genotoxicity result: Positive

Cytotoxic concentration (if applicable): ≥ 7500 μg/plate

Results remarks: All positive and negative control values in both assays were within acceptable limits.

CONCLUSIONS

T he results for DETDA samples 663, 692, 705 and 722 were positive in the Ames/ Salmonella Plate Incorporation Assay under the conditions, and according to the criteria, of the test proto co l

. Although DETDA 544

- dist reproducibly induced statistically significant increases in revertant frequencies in a ll three experiments, none of the increases were 2

- fold background and DETDA
544

- dist is there fore considered to be negative.

STUDY RELIABILITY

[2] Reliable with restrictions. Important study details were missing from the study provided and included purity and composition of the test substance.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

66 REFERENCES

Stankowski, L., and Naismith, R. 1987 a . Ames/ Salmonella Plate Incorporation Assay with DETDA Samples 544

- dist, 663,692, 705 and 722. Report # PH 301

- ET

- 002

- 87. Performing Laboratory: Pharmakon Research International, Waverly, PA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

67 Study 11 : Mutagenicity study in Salmone lla typhimurium ( Schechtman et al., 1978 )

Title: Activity of DET D A in the Salmonella / m icrosomal a ssay for b acterial m utagenicity

This study is : Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: Test substance referred to as “DETA”, identified as “diethyltoluenediamine”, brown liquid

METHOD

Method/guideline followed: The test was performed according to the method of Ames et al.

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Not indicated

Year study performed: 1978

Test species: Salmonella typhimurium strains TA98, TA100, TA1535, TA1537 and TA1538

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from Sprague

- Dawley adult male rat liv ers)

Concentrations tested: 0 (DMSO solvent control), 0 (untreated control), 0.05, 0.1, 0.5, 1 and 5 μl/plate

Statistical methods used: Linear regression analysis to determine strength of dose response

Test method/conditions remarks: For the purposes of this study, DETDA was used as a 5.0% solution (v/v) in DMSO.

Mutagenesis Assay without Metabolic Activation:
T he test was performed according the method of Ames et al. For the assay, the following were added, in order, to 16 x 125 mm pre

- capped tubes: 2 ml molten agar (0.6% Noble’s agar supplemented with 0.6% NaCl, 0.5 mM biotin, and 0.5 mM histidine).
0.1 ml of bacterial culture
0.1 ml of te st agent in the appropriate solvent.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

68 Tubes were mixed quickly but gently and the contents poured over a base plate of Spizzizen’s minimal medium. Plates were rotated to distribute the overlay agar, allowed to harden and
incubated at 37C for 48 hr at wh ich time the number of mutant colonies were determined. Each agent was tested at five concentrations against all five strains of bacteria.

Three plates were made for each control and each dilution of test agent. The following controls
were included i n each experiment.

Bacteria only for spontaneous reversion
Bacteria and solvent for solvent effect Known positive mutagens:
TA1535: N

- methyl

- N

- nitro

- N

- nitrosoguanidine , 5 μg/plate
TA100: N

- methyl

- N

- nitro

- N

- nitrosoguanidine, 5 μg/plate
TA1537: 9

- Aminoacridine , 100 μg/plate
TA1538: 2

- N itrofluorene , 5 μg/plate
TA98: 2

- Nitrofluorene , 5 μg/plate Sterility

The solvent and each dilution of test agent were checked for sterility by adding 0.1 ml of each to 2 ml overlay agar without bacteria and po uring over a minimal medium base plate. Plates were
incubated as above.

The solvent was determined by the solubility of the test agent. Whenever possible, distilled water was the solvent of choice. DMSO, ethanol, acetone and ethyl acetate may also be used in descending order of preferences. The compound tested in this study was dissolved in DMSO.

Non

- specific induction of liver enzymes: Aroclor 1254, a p ol ychlorinated biphenyl, was used for
the non

- specific induction of liver enzymes in rats. Adult male Sprague

- Dawle y rats, weighing
200

- 225 g, were given a single IP injecti on of 500 mg/kg Ar o clor 1254 in corn oil. On day 5 post injection, animals were sacrificed by CO 2 asphyxiation and the livers were removed and the S

- 9 fraction prepared. Animals had free access to food until12 to 15 hr before sacrifice; water was
available at all times.

Preparation of S

- 9 fraction of the liver homogenate: All operations were performed aseptically at
0

- 4 °C using sterile solutions and glassware. After surgical remo val and weighing, livers were
minced in three volumes 0.15 M KC1 and homogenized in a Potter Elvejhem tissue grinder at
120

- 150 rpm. The h o mogenate was centrifug e d at 9900 X g for 20 min and t he supernatant decanted and saved and designated as the S

- 9 frac tion, The S

- 9 was divided into 1 m l amounts and stored frozen a t

- 80°C until the day of use.

Preparation of S

- 9 mix: On the day of the assay, sufficient S

- 9 for that day's use was thawed and
mixed with cofact or s for use in the assay. S

- 9 mix contains per ml: S

- 9 (generally 50 μ l to 100 μl ), 0. 8 MgCl 2 , 0.33 mM KC l , 0.5 m M glucose 6 phosphate, 0.4 RM NADP, 2and 100 mM
NaH 2 PO 4 *H 2 O

, pH 7.4

. Reagents for the S

- 9 mix were weighed and pr epared fresh daily w i th the exception of sodium phosphate which was made as a stock solution of 0.2 M. The entire S

- 9Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

- 1

69 mix was filter sterilized before use through a 0.45 u Nalgene disposable filter unit. S

- 9 mix was kept at 0

- 4 °C until use; unused portions were discarded at the end of the day.

Standardization of S

- 9 for use in the assay: Each bulk preparation of S

- 9 was assayed for aryl hydrocarbon hydroxylase (AHH) activity; protein was determined according to the method of Weigele et al

.

Prior to use in the assay, each S

- 9 preparation was titrated o ver a range of concentrations (10

- 300 μl S

- 9 per ml of S

- 9 mix) with 3

- methylcholanthrene (3MC) , benzo(a)

- pyrene (BP) and 6

-

a m inochrysene (6

- AC) to determine the optimum amount of S

- 9 for use in a general screening procedure. This was usually in the range of 50 to 100 μl per ml of S

- 9 mix.

The activity of the S

- 9 preparation was confirmed by its ability to activate the control mutagens,
2

- AA and Aflatoxin B 1 which require metabolism to exert their effect, to reactive derivatives.

Mutagenesis Assay with Metabolic A ctivation: The assay was the same as that in the non

- metabolic activation assay described above except that
0.5 ml of S

- 9 mix was added to the overlay agar immediately before it was mixed and poured.
Plates were incubated and scored as noted above.

Controls for the assay with metabolic activation were:
Bacteria with S

- 9 mix to determine the effect of S

- 9 upon spontaneous reversion Bacteria, S

- 9 mix and solvent to determine the effect of the solvent Positive control mutagens: TA1535: 5 μg 2

- Aminoanth racene TA100: 1 μg Aflatoxin B 1 TA1537: 1 μg 6

- Aminochrysene TA1538: 2 μg 2

- Aminofluorene TA98: 1 μg Aflatoxin B 1 Sterility control s on each dilut i on of a test agent were done as noted above. One

- half ml of the
S

- 9 mix with neither test agent nor bacteria was added to 2 ml overlay agar and poured on to a minimal medium base plate. Plate sterilities were also performed.

Before an agent is reported to be either active or inactive in the Salmonella /microsoma l assay, the following criteria must be met:

A ll sterility controls must be negative for bacterial g rowth

T he spontaneous revertants for each strain must be within acceptable limits.

All 3 control plates must have approximately equal numbers of revertant colonies. The solvent
controls must have app roximately the same number of colonies as spontaneous reversion
controls. Positive mutagens must give at least 3x the number of colonies as the controls for spontaneous reversion. Any test with a strain which does not meet these criteria must be repeated

on a separate day.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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70 All criteria noted above must be met before results with an unknown agent can be evaluated

. To
be considered positive, an unknown agent should exhibit a dose response effect. That is, there
should be an increasing number of mu tants with increased amounts of test agent. For strains TA1535, TA1537, TA1538 and TA98, the first positive dose must produce 3x the number of
colonies as the negative control. For strain TA100, at least one dose tested must produce 3.5x the
number of mutants as the spontaneous reversion control.

RESULTS

The test compound without activation did not induce a significant increase in the number of revertant colonies over that shown in the untreated control plates in strains TA1538, TA100 and
TA98.

The test compound without activation did induce a significant increase in the number of revertant colonies over that seen in the untreated control plates for TA1535 and TA1537.

The test was also performed with the addition of an exogenous source of liver enz ymes. This did
not affect the activity of the test agent in this system for strains TA1535, TA1537, TAl538,
TA100 and T A98.

Genotoxicity result: Positive

Cytotoxic concentration (if applicable): Toxicity was not observed

Results remarks: Negative and positive controls responded appropriately.

CONCLUSIONS

The test agent did not induce a significant increase in the number of point mutations in Salmonella typhimurium strains in the absence of the activating system f or stra i ns TA1538,
TA100 and TA98.

The test agent did induce a significant increase in the number of point mutations in Salmonella typhimurium strains in the absence of t he activating enzyme system f or strai ns TA1535 and
TA1537.

It also did not induce a significant increase in the number o f point mutations with the addition of

an exogenous source of live r enzymes for metabolic activation in strains TA1535

, TA153 7

, TA1538, TA100 and TA98.

STUDY RELIABILITY

[2] Reliable with restrictions. Important details were missing from the study including p urity and composition of the test substance and GLP compliance.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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71 REFERENCES

Schechtman, L., Parmar, A., Fabrizio, D. 1978. Activity of DETA in the
Salmonella /Microsomal Assay for Bacterial Mutagenicity. Final Report. Project No. T1360.
Per forming Laboratory: Microbiological Associates, Inc., Bethesda, MD. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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72 Study 12 : Mutagenicity study

- In vitro gene mutation in mammalian cells ( Durw ar d and Nolan, 2000)

Title: LZ1224.20: L5178Y TK +/

- Mouse Lymphoma Assay

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym s : Diet hyltoluenediamine (DETDA), DETDA 80; Purity: 98.4%; Composition of test material: 77.6% 3,5

- diethyltoluene

- 2,4

- diamine (GC), 20.8% 3,5

- diethyltoluene

- 2,6

- diamine (GC); Impurities: 0.4% ethyl toluenediamine (GC), < 0.0150% toluenediamine (GS), 0.02% (w/w)

water

Remarks: Amber slightly viscous liquid ; Batch No. 2235

METHOD

Method/guideline followed: OECD 476

Test type: In vitro mammalian cell gene mutation

GLP compliant?: Yes

Year study performed: 19 99

Test species: Mouse lymphoma L5178Y cells

Metabolic activation: With and with out

Concentrations tested: 0 (negative control); 0 (DMSO vehicle control); Preliminary toxicity test: 28.1 to 1800 μg/mL; Experiment 1: 28.1 to 600 μg/mL (without S9), 225 to 1800 μg/mL (with S9); Experiment 2: 25 to 400 μg/mL (without S9), 200 to 1100 μg/mL (with S9); Experiment 3: 300 to 1300 μg/mL (with S9)

Statistical methods used: The statistics were based on the UKEMS recommended procedures as reported by Cole et al. (1990).

For DETDA to have a ‘significant’ result, two or more of the following criteria had to be met:

1. A statistically significant increase in mutant frequency
2. A greater than threefold increase in the mutant frequency per survivor over the negative
control value
3. A concentration

- related increase in the mutant frequency per survivor
4. An increase in the absolute number of mutants

DETDA would be reported equivocal if only one of the ab ove criteria was met.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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73 Test method/conditions remarks: A preliminary toxicity test was performed on cell cultures using a 3

- hour exposure time both
with and without metabolic activation (S9) and a continuous 24

- hour exposure without S9. The cells were incubated at 37°C for 10 to14 days and then scored for colony formation. The plating efficiency values obtained were adjusted for each concentration level to account for immedia te post treatment toxicity as a comparison to the vehicle control to give a percent survival value. A comparison of each percent survival value to the concurrent vehicle control was performed to give a relative survival value.

For mutagenicity tests, dup licate cultures (A and B) were established for each concentration level
both with and without activation.

Mutagenicity Tests Experiment 1: Cells were counted and processed to give 1 x 10 6 cells /mL in 10 mL aliquots in sterile plastics universals. The t reatments were performed with and without S9 at six
concentration levels of DETDA, vehicle, or positive controls brought to a total volume of 20 mL

. The treatment vessels were incubated at 37°C for 3 hours with continuous shaking using an
orbital shaker.

Experiment 2: Cells were counted and processed to give 1 x 10 6 cells /mL in 10 mL aliquots in sterile plastics universals for the 3

- hour pulse treatment with S9. In the absence of S9, the exposure period was continuous for 24 hours using 10 mL cultures of 0.3 x 10 6 cells/mL in 25

cm 2 tissue culture flasks. After additions of S9, test material, or controls, the volume was brought to 20 mL and t he treatment vessels were incubated at 37°C with continuous shaking using an orbital shaker.

Experiment 3: In both Experiments 1 and 2, DETDA induced a small statistically significant
concentration

- related increase in the mutant frequency over the vehicle control. However, in experiment 1, there were only three concentration levels that were not too toxic, an d in Experiment 2, optimum toxicity (10

- 20% survival) was not achieved. Therefore, a third confirmatory experiment was performed to investigate the reproducibility of the response. The test conditions used were the same as for the first two experiments.

At the end of the treatment period, for each experiment, the test media were removed by centrifugation and the cells were washed twice in R10 medium and resuspended in R20 medium at a cell density of 2 x 10 5 cells/mL. A sample of cells was removed for di lution to 10 cells/mL and plating in non

- selective medium to determine Day 0 viability. The percent survival value was adjusted to account for immediate post

- treatment toxicity as a comparison to the vehicle control using the cell count data. A compariso n of each treatment percent survival value to the concurrent control value was performed to give a relative survival value.

The remaining cells were incubated and subcultured daily for the required expression period, by counting and dilution to 2 x 10 5 cells/mL. On the second day after the end of the treatment period, the cells were counted, diluted to 10 4 cells/mL, and plated for mutant frequency (2000 cells/well) in selective media containing 4 μg/mL 5

- trifluorothymidine (5

- TFT). After 10 to 14 days of incubation, t he plates were scored using a magnifying mirror box. To assist the scoringFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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74 of the TFT mutant colonies, MTT solution was added to each well of the mutation plates and the plates were incubated for approximately 2 hours. The number of posit ive wells (wells with colonies) and numbers of small and large colonies were recorded. The mutation frequency was calculated using the following equation:

Mutation Frequency per survivor = [(

- lnP(0) selective medium)/cells per well in selective medium)]/ surviving fraction in non

- selective medium, where P(0) is the number of negative wells/total wells plated.

Criteria for Determination of a Valid Test

– The laboratory’s normal range for mutant frequency per survivor is 26

- 150 x 10 6 for the TK+/

- lo cus in L5178Y cells. Vehicle control results should be within this range, although minor errors in cell counting and dilution or exposure to the metabolic activation system may cause this to be slightly elevated. Experiments where the
vehicle control val ues are markedly greater than 200 x 10 6 mutant frequency per survivor are not normally acceptable and will be repeated. Positive controls should produce a significant (at least
3

- to 5

- fold) increase in mutant frequency per survivor over the negative controls.

Vehicle Used?: Yes

Vehicle Name: DMSO

Positive Control Substances: Without metabolic activation: ethylmethanesulphonate (Experiment s 1 and 2) . With metabolic activation: cyclophosphamide (Experiments 1, 2, and 3)

.

RESULTS

Genotoxicity result: Positive

Cytotoxic concentration s (if applicable): Experiment 1: 1200, 1500, 1800 μg /mL (with S9), 600 μg /mL (without S9); Experiment 2: 300, 400 μg /mL (without S9); Experiment 3: 1300

μg /mL (with S9)

Results remarks: Preliminary Toxicity Test: In the presence of S9, toxicity was observed with DETDA at 1800 μg/mL. In the absence of S9, the toxicity was concentration

- related, such that
after a 3

- hour exposure, toxicity was evident at and above 112.5 μg/mL. At the extended

exposure period of 24 hours in the absence of S9, toxicity occurred at all concentrations, with a rapid onset of toxicity such that no cells were observed at and above 900 μg/mL. No test material precipitate was noted.

Mutagenicity Test Experiment 1: The test material induced a concentration

- related toxic response as indicated by the Day 0 viability values and relative survival values. There was also evidence of a reduction in Day 2 viability and relative total growth with the test mate rial. The toxicity was such that in the absence of metabolic activation the maximum test material concentration level of 600 μg/mL, and in the presence of metabolic activation 1200, 1500, and 1800 μg/mL, were excluded from the statistical analysis because their toxicity exceeded the maximum acceptable level of 90%.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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75 This resulted in the group with S9 having only three surviving concentration levels with acceptable toxicity, whereas, ideally there should have been four concentration levels.

DETDA induced a statistically significant concentration

- related (linear trend) increase in the mutant frequency at 10 6 per viable cell in the presence of S9 at and above 900 μg/mL. The increase was partly due to small colony formation indicating a clastogenic response

.

Experiment 2: The 24

- hour continuous exposure without S9 treament demonstrated that the extended time point lowered the concentration level of the test material where the onset of toxicity occurred. As seen in Experiment 1, there was evidence of a c oncentration

- related reduction in Day 0 viability and relative survival values in cultures treated with DETDA in the absence of S9. There was evidence of a reduction in Day 2 viability and relative total growth. The toxicity observed with the test materi al at 300 and 400 μg/mL was considered to be excessive, and therefore, these concentration levels were excluded from the test statistics. In the presence of S9, there was no clear repeat of the toxicity observed with the test material in Experiment 1, and only reduction of Day 0 and Day 2 viabilities and relative total growth values
were observed.

DETDA induced a statistically significant concentration

- related increase in the mutant frequency per viable cell in the presence of metabolic activation. In the absence of metabolic activation, an
increase was observed but at concentration levels with unacceptable toxicity. As with Experiment 1, the increase in mutant frequencies was partly due to small colonies, suggesting clastogenic activity.

Experiment 3 : A 3

- hour pulse exposure with S9 was carried out to confirm the positive response observed in Experiments 1 and 2. There was evidence of a concentration

- related reduction in Day 0 relative survival, Day 0 and Day 2 viabilities, and relative total growth.

DETDA induces a statistically significant concentration

- related increase in mutant frequency per viable cell, although the maximum concentration tested, 1300 μg/mL, was excluded from the data due to excessive toxicity. The increase in mutant frequency w as partly due to small colony formation suggesting clastogenic activity.

CONCLUSIONS

The negative control and positive control fulfilled the requirements for determination of a valid

test.

Under the conditions of the assay described in this report, th e data suggest that DETDA induce s mutations at the thymidine kinase locus in the presence of metabolic activation and should be considered positive in the mouse lymphoma gene mutation assay.

STUDY RELIABILITY

[2] Reliable with restriction s

. The r eport was supplied as a n IUCLID summary and important details were missing . The summary defines the medium R10 but does not define medium R0 orFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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76 medium R20. As appropriate under 40 CFR 799.9530 (TSCA in vitro mammalian cell gene mutation test) guidance, the stu dy summary included the numbers of small and large mutant colonies; however, the IUCLID summary did not indicate whether the original study presented mutation frequency by colony size.

REFERENCES

Cole, J., Fox, M., Garner, C, McGregor, D.B., and Thacker, J. 1990. “Gene mutation assays in cultured mammalian cells.” IN: Basic Mutagenicity Tests UKEMS Recommended Procedures (Ed. Kirkland, D.J.), Cambridge University Press, pp 87

- 114.

Durward, R. and Nolan, S. 2000. LZ1224.20: L5178Y TK +/

- Mouse L ymphoma Assay, SPL Project Number: 102/301. Study No. 3170. Performing Laboratory: SafePharm Laboratories, Ltd. Shardlow, Derbyshire. Sponsor: Lonza Limited, Basle, Switzerland. (Cited as Durwood and Nolan [2000] in summary submitted by Albemarle and Lo nza on March 1, 2012)Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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77 Study 1 3 : Mutagenicity stud ies in Salmonella typhimurium ( Naismith and Matthews, 1979 )

Title: Ames Salmonella /microsome plate test

This study is : Adequate Not Adequate

This study is not adequate because the test substance composition is not adequately defined; it is referred to only as “DETA”. Other missing details include purity of the test substance and
statistical methods used.

TEST SUBSTANCE

Identity: Test substance is ref erred to only as “DETA” ; Purity not specified

Remarks: Dark brown liquid.

METHOD

Method/guideline followed: PH

- 301/340

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1979

Test species: Salmonella typhimurium strains TA1535, TA1537, TA1538, TA98 and TA100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 8, 40, 200, 1000 and 5000 μ g/plate (preliminary toxicity screen); 0 (DMSO solvent control), 10, 33, 100, 333 and 1000 μg/plate (mutation assay)

Statistical methods used: Not indicated

Test method/conditions remarks: DETA was miscible in D MS O. It was also noted that
extended contact with 70% ethanol and distilled wate r caused both solutions to turn blue aft e r several hours. Dose levels for the Pre liminary Toxicity Scr e en were 5000, 1000, 200, 40 and 8

μ g/plate

. Strain TA1538 showed complete inhibi ti on at 5000 μ g/plate and abnormal backg round
lawn g rowth at al l other levels. Strain TA 100 showed c ompl ete i nhibition a t 5000 μ g/plate and
moder ate inhi bi tion a t 1000 an d 200 μ g/plate. Dose levels f o r DETA in the plate assay were 1000, 333, 100, 33, and 10 μ g/plate. Ther e was 0.07 ml of S

- 9 supernatant per 1.0 m l of S

- 9 mix
used in the rat liver micr osomal activation system.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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78 Tester strains TA1535, TA1537, TA1538, TA98, and TA100 are plated untreated, both with and without metabolic activation, to obtain background lawn and revertant colony f ormation to serve as negative controls. Positive controls are strain specific and are as follows:
TA1535

- without activation

- N

- Methyl

- NPR

- Nitro

- N

- Nitroso g uanidine (20 μ g/ml)
TA1537

- without activation

- 9

- aminoacridine (1500 μ g/ml)
TA1538

- with activation

- 2

- aminofluorene (100 μ g/ml)
TA98

- with activation

- 2

- aminofluorene (100 μ g/ml)
TA100

- without activation

- N

- Methyl

- NPR

- Nitro

- N

- Nitroso g uanidine

Tester strains TA1535, TA1537, TA1538, TA98, and TA100 are treated with five lev els of the test compound. All negative and positive controls are plated in triplicate. All treated groups are plated in duplicate.

RESULTS

The results for DETA were negative in strains T A1535, TA1537, TA1538, TA98, and TA100 of
Salmonella typhimurium in the Ames Test both with and without metabolic activation at 1000, 333, 100, 33, and 10 μ g/plate.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): ≥ 8 μ g/plate

Results remarks: All negative and positive controls were within one standard deviation of
historical data.

CONCLUSIONS

The test substance was not mutagenic in S. typhimurium strains T A1535, TA1537, TA1538,
TA98 or TA100 with or without metabolic activation.

STUDY RELIABILITY

[ 3 ] Not reliable

. The test substance composition is not adequately defined; it is referred to only
as “DETA”. Other missing details include purity of the test substance and statistical methods
used.

REFERENCES

Naismith, R., and Matthews, R. 1979. Summary Data from Ames Salmonella /Microsome Plate Test With and Without Metabolic Activation on DETA. Performing Laboratory: Pharmakon Laboratories, Scranton, PA. Sponsor: Ethyl Corporation.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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79 Study 1 4 : Mutagenicity study in Salmonella typhimurium ( Lawlor, 1985 )

Title: Salmonella / m ammalian

- microsome p late i ncorporation m utagenicity a ssay

This study is : Adequate Not Adequate

This study is not adequate for the following reasons: (1) Important details are missing from the study including purity an d composition of the test substance, method/guideline followed, test concentrations used in the mutagenicity assay , statistical methods used, analytical data to verify actual concentrations used in the assay

, cytotoxicity and the results section for the mutagenicity assay. (2) According to guideline recommendations, if 2

- aminoanthracene is used as a positive control, each batch of S9 should also be characterized with a mutagen that requires metabolic activation by microsomal enzymes; how ever, this assay employed 2

- aminoanthracene as the sole indicator of the efficacy of the S9

- mix. (3) Results of positive control assays were not provided.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Referred to as Diethyltoluenediamine (DETDA); Purity not specified

Remarks: Also referred to as MA #T4018; Clear, dark red syrupy liquid

METHOD

Method/guideline followed: Not indicated

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1985

Test species: Salmonella typhimurium strains TA98, TA100, TA1535, TA1537 and TA1538

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 0 (DMSO solvent control), 10, 33, 67, 100, 333, 667, 1000, 3333, 6667 and 1000 μg/plate (preliminary toxicity assay); test concentrations for the m utagenicity assay were not specified

Statistical methods used: None specified

Test method/conditions remarks: The experimental materials, methods and procedures are
based on those described by Ames, B, N., et al . Methods for detecting carcinogens and mutagens
with the Salmonella /Mammalian

- Microsome Mutagenicity Test, Mutation Research 31 : 347

- 364, 1975.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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80 Media Preparation Top Agar for Selection of Histidine Revertants: Minimal top agar was prepared with 8 g/liter
Difco Bacto Agar and 5 g/liter NaCl . After autoclaving, the molten agar was distributed into
sterile bottles and stored at room temperature. Immediately before its use in the mutagenicity assay, the top agar was melted and supplemented with 10 m l /100 ml agar of a sterile solution
which contained 0.5 mM L

- histidine and 0.5 mM D

- biotin. Twenty

- five ml of sterile deionized water was added per 100 ml top agar when it was used in assays without metabolic activation.
This ensured that final top agar and amino acid supplement con centrations were the same on plates with or without metabolic activation.

Top Agar for Viable Count Determination: Minimal top agar as described above was supplemented with 35 m 1/100 ml agar of a sterile solution which contained 1.4 mM L

- hisitidine
and 0.12 mM D

- biotin.

Minimal Bottom Agar: Bottom agar was Vogel

- Bonner minimal medium E.

Nutrient Broth: Nutrient broth used for growing overnight cultures of the tester strains was Vogel

- Bonner salt solution supplemented with 2 5 g per liter of Nutrient Brot h No. 2 (Oxoid).

Nutrient Bottom Agar: Nutrient bottom agar was Vogel

- Bonner minimal medium E supplemented with 2 5 g per liter of Nutrient Broth No. 2 (Oxoid).

Tester Strain Diluent: Diluent for tester s train titering contained Vogel

- Bonn e r salt solution with 25 g per liter of Nutrient Broth No. 2 (Oxoid).

Test Article Diluent: The solvent used for diluting the test article was dimethylsulfoxide (CAS
#67

- 68

- 51, Fisher Scientific Company, Certified A.C.S.

Tester Strains: The tester strain s used were histidine auxotrophs TA98, TA100, TA1535, TA1537 and TA1538 as described by Ames.

The test article was checked for toxicity to the tester strains up to a concentration of 10 mg/plate. An aliquot from ten dilutions of the test article was pla ted with an overnight TA100 culture on selective minimal agar, both in the presence and absence of metabolic activation. Toxicity is detectable by a decrease in the number of revertant colonies occurring per plate and/or by a thinning or disappearance of t he background bacterial lawn. The highest concentration of test article used in the subsequent mutagenicity assay was that which gave a detectable reduction in the number of revertants per plate and/or produced a thinning or disappearance of the background bacterial lawn.

When necessary, separate dose levels are plated for the portion of the assay with metabolic activation and the portion of the assay without metabolic activation.

Plating Procedures for the Mutagenicity Assay Testing System Identification : Each plate was labeled using indelible ink with a code system which identifies the test article, test phase, doseFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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81 level and activation as described in detail in Microbiological Associates, Inc.'s Microbial Mutagenesis Standard Operating Procedures.

Test Article: The test article was solubilized and serially diluted immediately before its use in the mutagenicity assay. Five doses of the test article were plated with all five testes strains (TA98, TA100, TA1535, T A l 5 37 and TA1538) with metabolic activatio n and without metabolic
activation. All positive controls, solvent controls and test article doses were plated in triplicate

. Without metabolic activation, 50 μl of tester strain and 50 μl of solvent or test article were added

to 2.5 ml of molten selectiv e top agar at 45°C. With metabolic activation, 50 μl of tester strain, 50 μl of solvent or test article, and 0.5 ml of S

- 9 mix were added to 2.0 ml of molten selective top agar at 45°C. After vortexing, the mixture was overlaid onto the surface of 25 ml of minimal bottom agar. After the overlay had solidified, the plates were inverted and incubated for 48 hours at 37°C. Plates which were not counted immediately following the 48

- hour incubation period were stored at 4°C until such time that colony counting c ould be conducted.

Positive Controls: All combinations of positive controls and tester strains plated along with the assay are listed below:

Strain Activation Positive Controls Conc. per Plate
TA98 + 2

- Aminoanthracene 4.0 μg
TA98

- 2

- Nitrofluorene 5.0 μg TA100 + 2

- Aminoanthracene 4.0 μg
TA100

- Sodium Azide 5.0 μg
TA1535 + 2

- Aminoanthracene 4.0 μg
TA1535

- Sodium Azide 5.0 μg
TA1537 + 2

- Aminoanthracene 4.0 μg
TA1537

- 9

- Aminoacridine 75 μg
TA1538 + 2

- Aminoanthracene 4.0 μg
TA1538

- 2

- Nitrofluorene 5.0 μg

9

- Aminoacridine (CAS #134

- 50

- 9), Aldrich Chemical Co., 98% pure
2

- Aminoanthracene (CAS #613

- 13

- 8), Sigma Chemical Co., practical grade
2

- Nitrofluorene (CAS #607

- 57

- 8), Ald r ich Chemical Co., 98% pure Sodium Azide (CAS #26628

- 22

- 8), Sigma Chemical Co., practical grade

Tester Strain Titers: Tester strain titers were determined by viable count assays on nutrient agar plates. The averaged number of cells plated per plate are reported on the individual strain data
forms.

Test Article Sterility Determination: The most concentrated test article dilution for the mutagenicity assay was checked for sterility by plating a 50 μ l aliquot of the dilution on selective

agar.

Preparation of S

- 9 Homogenates: Liver microsomal enzymes w ere prepared from male Sprague

Dawley rats that had been injected with Aroclor 1254 at 500 mg/kg. The Aroclor was diluted inFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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82 corn oil to a concentration of 200 mg/ml. Five days after their i.p. injection with the Aroclor, the rats were sacrificed by decapi tation, and their livers were excised

.

The preparation of the microsomal enzyme fraction was carried out with sterile glassware and
solutions at 0

- 4°C. The liver from each rat was excised and placed in approximately 20 ml of 0.15M KCl contained in a pre

- w eighed beaker. After weighing the liver, it was transferred to another beaker containing 3 volumes of 0.15M KC l (3 ml/g of wet lives) where it was minced with sterile scissors. The minced liver was homogenized and centrifuged at 9000 x g for 10
minutes. Th e supernatant (referred to by Ames as the S

- 9 fraction) was decanted, and small aliquots were distributed into freezing ampules which were stored at ≤

- 70°C.

Preparation of S

- 9 Mix: The S

- 9 mix was prepared immediately before its use in the mutagenicity a ssay.

Colony Counting: Revertant colonies for a given tester strain within a given test article dilution series were counted either entirely by automated colony counter or entirely by hand. Plates with
sufficient test article precipitate to interfere with automated colony counting were counted manually.

The condition of the background bacterial lawn was evaluated f o r evidence of test article toxicity, by using a dissecting microscope. This toxicity was scored relative to the solvent control plate and reco rded along with the revertant count for that plate on the individual strain data
forms.

Analysis of Data: All platings were done in triplicate. For each triplicate plating, an average and
standard deviation were calculated. The calculations were done on a Hewlett

- Packard HP 25

program m able calculator.

Evaluation of Mutagenicity Assay Data: For a test article to be considered positive, it must cause at least a doubling in the mean revertants per plate of at least one tester strain. This increase in
the mean number of revertants per plate must be accompanied by a dose response to increasing
concentrations of the test article. In those cases where the

- observed dose

- responsive increases in
TA1537 or TA1538 revertants per plate is less than three

- fold, the r esponse must be reproducible.

Stability of the Test Article: The stability of the test article under the actual experimental conditions used in this study was not determined by Microbiological Associates, Inc.

RESULTS

Genotoxicity result: Positive

Cytotoxic concentration (if applicable): Not indicated

Results remarks: None specifiedFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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83 CONCLUSIONS

Diethyltoluenediamine (MA #T4018) did cause positive dose responsive increases with tester strains TA98, TA100 and TA1538, only in the presence of Aroclor

- induced rat liver microsomes.

STUDY RELIABILITY

[ 3 ] Not reliable. Important details are missing from the study including purity an d composition of the test substance, method/guideline followed, test concentrations used in the mutagenicity

assay , statistical methods used, analytical data to verify actual concentrations used in the assay

, cytotoxicity and the results section for the mutagenicity assay. According to guideline recommendations, if 2

- aminoanthracene is used as a positive control, each batch of S9 should also be characterized with a mutagen that requires metabolic activation by microsomal enzymes; however, this assay employed 2

- aminoanthracene as the sole indicator of the efficacy of the S9

- mix. Furthermore, results of positive control assays were not provided.

REFERENCES

Lawlor, T. 1985. Salmonella /Mammalian

- Microsome Plate Incorporation Mutagenicity Assay. Study No. T4018.501015. Performing Laboratory: Microbiological Associates , Inc. , Bethesda, MD. Sponsor: American Cyanamid Company , Wayne, NJ

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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84 Study 1 5 : Mutagenicity stud ies in Salmonella typhimurium ( Schechtman et al., 1980 )

Title: Activity of T1566 in the Salmonella /microsomal assay for bacterial mutagenicity

This study is : Adequate Not Adequate

This study is considered to be unreliable because only 2 bacterial strains were tested and because
the test substance is identified as “diethyl toluene amine”, which is not the chemical specified in
the test rule

T EST SUBSTANCE

Identity: 94% DETA (“diethyl toluene amine”)

Remarks: Also referred to as T1566; Clear dark red liquid; Lot OB#999

- 79 ; K nown impurities include monoethyl toluene diamines

.

METHOD

Method/guideline followed: Not indicated

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Not indicated

Year study performed: 1979

Test species: Salmonella typhimurium strains TA1535 and TA100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 0 (negative bacteria only control and DMSO solvent control), 1, 3, 5, 7 and 10 μl/plate

Statistical methods used: The numbers of revertant colonies from each set of tri plicates were averaged and the standard deviation cal culated. The average number of revertant colonies found in the test compound plates was compared to those found with the solvent control. A compound is considered a mutagen if a dose related increase in the number of revertant colonies is found in
the treatment groups. The first dose level con sidered for the increase must have an average
number of re vertant colonies which is three times that of the solvent control.

Test method/conditions remarks: The purpose of this study was to employ the Salmonella / microsomal assay to investigate the mutagenic potential of the test article that has been designated in this final report as T1566, otherwise known as DETA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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85 A. Mutagenesis Assay Without Metabolic Activation : The assay was performed by the method
of Am es et al. with the addition of several recomm endations

. The five bacterial tester strains
were identified and characterized for the genetic markers described by Ames et al

. Briefly, broth
cultures of S. typhimurium tester strains were grown at 37 ± 1°C fo r 16

- 20 hours and 100 μ l containing 1

- 3 x 10 8 bacteria were added to 2 ml molten top agar supplemented with 0.6% NaCl
and 0.05 mM histidine ·HCl and 0.05 mM biotin. The appropriate dose of test chemical, solvent, or positive control (100 μ l) was added. The tubes were vortex

- mixed and the contents pour ed onto a base plate of Spizizen’s minimal medium . The overlay agar was evenly distributed over the base plate and allowed to harden. The test chemical was tested at five dose levels against all five strains of bacteria. Controls of bacterial only were i ncluded for spontaneous reversion. All treatments were performed in triplicate. Plates were incubated 48 hours at 37 ± 1°C after which time the number of revertant colonies were counted on a Biotran II automatic colony counter.

Due to the facts that col onies around the periphery of the plates are masked and that overlapping
colonies are not effectively counted, the machine counts were adjusted t o com pensate for the resulting tendency of automatic counts to be somewhat lower than manual counts. The following formula: Y =

- 7.4 + 1.606X

– (7.1 x 10 - 4 ) X 2 + (6.31 x 10 - 7 ) X 3 , where Y = corrected counts and X = machine counts, was found to transform the machine counts to values which accurately reflected manual counts , It was found that no correction was necessary for machine counts less than 12. All machine counts greater than 1935, i.e. adjusted counts greater than 5000 were reported as too numerous to count (TNTC).

B. Mutagenesis Assay With Exogenous Metabolic Activation : The S

- 9 was prepared accordin g to established procedures. Adult male Sprague

- Dawley rats, weighing 200

- 300 gm, were induced by a single intraperitoneal injection of Aroclor

- 1254 at a dosage of 500 mg /kg body weight five days before sacrifice. The animals were sacrificed and their livers a septically
removed. The excised tissue was rinsed three times in cold sterile 0.15 M KCl and then homogenized in a Polytron Tissuemizer at a concentration of 1:3 w/v in 0.15 M
KCl. The supernatant fraction ( i.e., S

- 9) was collected, portioned into aliquots for daily use, and
stored frozen at

- 70°C until use. Each bulk preparation of S

- 9 is assayed for aryl hydrocarbon hydroxylase activity and total protein content prior to use.

On the day of the assay, the S

- 9 was mixed with the co

- factor pool to c ontain: S

- 9 (100 μl/ml
cofactor pool), 8 mM MgCl 2 , 33 mM KCl, 5 mM glucose

- 6

- phosphate, 4 mM NADP and 0.1 M sodium phosphate, pH 7.4. S

- 9 mix was sterile filtered and stored on ice until used.

The mutation assay was performed in the same way as that described in Section A, except 0.5 ml
of the S

- 9 mix was added to the overlay agar immediately before it was mixed and poured. The
test chemical was tested at five dose levels against all five strains of bacteria. Controls of
bacteria only were included f or spontaneous reversion. All treatments were performed in triplicate. All five concentrations of the test chemical and the S

- 9 mix were checked for sterility.
Plates were incubated 48 hours at 37 ± 1°C after which time the number of revertant colonies

we re coun ted on a Biotran II automatic colony counter, All machine counts between 12 and 1935 were corrected by the following formula: Y =

- 7.4 + 1.606X

- (7.1 x 10 - 4 ) X 2 + (6.31 x 10 - 7 ) X 3

, where Y = corrected counts and X = machine counts. N o correction was required for machineFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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86 counts less than 12 and all machine counts greater than 1935 were reported as too numerous to

count (TNTC)

.

Controls: In the assay without exogenous metabolic activation, so dium azide (30 μ g/plate) was
used as the positive control for TA1535 and T A100, 9

- aminoacridine (100 μg/plate) for T A1537,
and 2

- nitrofluorene (5 μg/plate) for TA1538 and TA98. For the assay with exogenous metabolic activation, 2

- aminoanthracene ( 2.5 μg /plate) was used as the positive control fo r all five strains.
The solvent vehicle for the test agent was used full strength (100 μ l /plate) as the negative
control.

Criteria for Determination of a Valid Test: All sterility controls, including the five concentrations of the test compound and S

- 9 mix, must be negative for bacterial growth,

The average number of revertant colonies representing spontaneous mutations must be within the following acceptable range: TA1535, 6

- 60 ; TA 1537, 3

- 16; TA1538, 6

- 35; TA100, 80

- 25 0; TA98, 10

- 60.

The average numbe r of revertant colonies in the positive control plates (i.e. sodium a z ide for TA1535 and TA100, 9

- aminoacridine for TA1537, and 2

- nitrofluorene for TA1538 and TA98
for the assay without exogenous metabolic activation; 2

- aminoanthracene for all strains in the presence of exogenous metabolic activation) must be at least five times those of the solvent
control.

RESULTS

The positive control for each of the five strains tested induced an average number of revertants/plate which was at least five times that found with the solvent control. All concentrations of T1566 tested failed to induce an average number of revertants/plate three times greater than that found in the solvent control.

The sterility con trols for the S

- 9 mix, positive controls, and the test article dilutions were all negative for bacterial contamination.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): > 10 μl/plate based on no cytotoxicity observed at the highes t concentration

Results remarks: The negative controls, positive controls, and sterility controls all fulfilled requirements for determination of a valid test.

CONCLUSIONS

Under the conditions employed in the assay described above , the data s ug gest that the test article
exhibits little or no muta ge nic activity in the Salmonella /microsomal assay.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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87 STUDY RELIABILITY

[ 3 ] Not reliable. This study is considered to be unreliable because only 2 bacterial strains were
tested and because the test substance is identified as “diethyl toluene amine”, which is not the chemical specified in the test rule. In addition, i mportant study details were missing from the study , including purity and composition of the test substance, GLP compliance and test

met hod/guidelines followed

.

REFERENCES

Schechtman, L., Curren, R., and Pamar, A. 1980. Activity of T1566 in the Salmonella / Microsomal Assay for Bacterial Mutagenicity Final Report. Performing Laboratory: Microbiological Associates. Bethesda, MD. Sponsor: Ethyl Corporation.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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88 Study 1 6 : Mutagenicity stud ies in Salmonella typhimurium ( Johnson and Pettigrew, 1987 b )

Title: Salmonella / microsomal a ssay with d arkened DETDA

- l ow c olor (Lot #6198

- 20

- 1)

This study is : Adequate Not Adequate

This study is considered to be unreliable because only 4 bacterial strains were tested.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: Referred to as d arkened DETDA

- l ow color, Lot #6198

- 20

- 1; Clear brown liquid

.

METHOD

Method/guideline followed: Protocol

- Ettox 027

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1987

Test species: Salmonella typhimurium strains TA1535, TA1537, TA98 and TA100

Metabolic activation: With S

- 9 metabolic activation from rat livers

Concentrations tested: 0 (untreated control), 0 (DMSO solvent control), 10, 37.5, 75, 100 and 125 mg/mL

Statistical methods used: Not indicated

Test method/conditions remarks: Salmonella typhimurium strains TA1535, TA1537, TA98 and TA100 were treated in the presence of metabolic activation (Aroclor 1254 induced rat liver
S

- 9 fraction) with Darkened DETDA

- Low Color in DMSO. Dose levels tested were 125, 100, 7 5, 37.5, and 10 mg/mL.

Darkened DETDA

- Low Color was soluble at all dose levels tested. Each dose was treated in triplicate. An untreated control, solvent control and positive control were treated concurrently.

RESULTS

125 mg/mL demonstrated toxicity in strain TA1535 with metabolic activation. This toxicity caused the apparent increase in revertant colonies in strain TA1535. Darkened DETDA

- l owFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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89 c olor did not cause a dose related increase in mutant colonies in any other strain in the presence of metabolic activation.

Genoto xicity result: Negative

Cytotoxic concentration (if applicable): 125 mg/mL in strain TA1535 with metabolic
activation

Results remarks: Color and appearance of the tes t article did no t change from the time of

r ecei p t to the time of use

.

CONCLUSIONS

Darkened DETDA

- Low Color was not genetically active in the Salmonella / Microsomal Assay according to Protocol

- Ettox 027

.

STUDY RELIABILITY

[ 3 ] Not reliable

. This study is considered to be unreliable because only 4 bacterial strains were
tested. In addition, i mportant study details were missing from the study summary provided

, includ ing purity and composition of the test substance and statistical methods used.

REFERENCES

Johnson, D., and Pettigrew, A. 1987 b . Genetic toxicology

. Salmonella /M icrosomal Assay with
Darkened DETDA

- Low Color (Lot #6198

- 20

- 1). Ames 101

- #112. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

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90 Study 1 7 : Mutagenicity stud ies in Salmonella typhimurium ( Johnson and Pettigrew, 1987 c )

Title: Salmonella / m icrosomal a ssay with DETDA

- l ow c olor

This study is : Adequate Not Adequate

This study is considered to be unreliable because only 4 bacterial strains were tested.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediame (DETDA ); Purity not specified

Remarks: DETDA

- Low Color

, Lot # 5869

- 75

- 1 and DETDA

- Obg , Lot # 5868

- 1 ; Clear liquid

.

METHOD

Method/guideline followed: Protocol Ettox

- 027

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1987

Test species: Salmonella typhimurium strains TA1535, TA1537, TA98 and TA100

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested: 0 (DMSO solvent control), 750, 1000, 3750, 7500 and 10,000 μg/plate

Statistical methods used: Not indicated

Test method/conditions remarks: Salmonella typhimurium strains TA1 535, TA1537, TA98
and TA 100 were treated in the presence of metabolic activation (Aroclor 1254 induced rat liver
S

- 9 fraction) with DETDA

- Low Color in DMSO. Dose levels tested were 1 0 ,000, 7 50 0, 3 750,
1 000, and 750 μg /plate. DETDA

- Lo w Color was soluble at all dose levels tested. Each dose was treated in triplicate. An u ntreated control, solvent control and positive control were trea t ed concurrently.

DETDA

- Obg (Lot #5868

- 1) was tested in the same strain s and at the same dose levels as
DETDA

- Low Color.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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91 RESULTS

DETDA

- Low Color did not cause a dose rela te d increase in mutant colonies i n any strain in the presence of metabolic activation. DETDA

- Obg caused a dose related in crease in mutant colonies in TA1535, TA1537, TA98, and TA 100 i n the presence of metabolic activation.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): Not indicated

Results remarks: Color and appearance of the test article did not change from the time of receipt to the time of use.

CONCLUSIONS

DETDA

- Low Color was not genetically active in the S almonella / Microsomal Assay according to
Protocol

– Ettox 027.

STUDY RELIABILITY

[ 3 ] Not reliable

. This study is considered to be unreliable because only 4 bacterial strains were tested. In addition, i mportant study details were missing from the study summary provided and
included purity and composition of the test substance, statistical methods used and cytotoxicity
of test substance.

REFERENCES

Johnson, D., and Pettigrew, A. 1987 c . Genetic Toxicology

. Salmonella /Microsomal Assay with
DETDA

- Low Color. Ames 099

- #111. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

- 98

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92 Study 1 8 : Mutagenicity stud ies in Salmonella t yphimurium ( Stankowski and Naismith,
1987 b )

Title: Ames/ Salmonella p late i ncorporation a ssay with DETDA

- l ow c olor Lot # 2

- 87

This study is : Adequate Not Adequate

This study is considered to be unreliable because only 3 bacterial strains were tested.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA ); Purity not specified

Remarks: Lot # 2

- 87 ; Clear liquid

.

METHOD

Method/guideline followed: Protocol

- 301

Test type: Ames Salmonella reverse gene mutation assay

GLP compliant?: Yes

Year study performed: 1987

Test species: Salmonella typhimurium strains TA1538, TA98 and TA100

Metabolic activation: With S

- 9 metabolic activation from rat livers

Concentrations tested:

Assay 1: 500, 750, 1000, 3750 and 7500 μ g/plate Assay 2: 1000, 3750, 7500, 10,000 and 12,500 μ g/plate

Statistical methods used: A positive result is defined as a reproducible, statistically significant

two

- fold dose

- dependent increase in the number of histidine

- independent colonies, with at least one dose point inducing an average revertant frequency that is two

- fold that of the so lvent control. Significance is determined using the program developed by Moore and Felton (1983 ). This program applies a linear regression analysis to the data points and any p value less than 0.05 is considered significant. Alternatively, if the test article produces an increase greater than or equal to three times the solvent control value (in the absence of a dose

- dependent increase), the test chemical is considered positive. A negative result is defined as the absence of a dose

dependent two

- fold in crease in the number of histidine

- independent revertants.

Test method/conditions remarks: DETDA

- Low Color was evaluated in triplicate cultures in strains TA1538, TA98 and TA100 in the presence of S9 at doses of 500, 750, 1000, 3750 andFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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93 7500 μ g/plate. The S9 mixture included 6% (v/v) Aroclor 1254

- induced male Sprague

- Dawley
rat liver homogen ate with the appropriate buffer and cofactors. Revertant frequencies for all
doses of DETDA

- Low Color in all strains approximated or were less than those observed in the concurrent negative control cultures. However, no toxicity was observed at the highest dose level evaluated. Therefore, DETDA

- Low Color was re

- evaluated i n all three strains at doses of 1000, 3750, 7500, 10,000 and 12,500 μ g/plate with S 9. Also evaluat ed in this second assay w as a concurrent positive control was a second sample of DETD A (Drum #6131). This latter sample of
D ETDA was previously found to be mutagenic in the A m e s/ Salmonella Plate Incorporation Assay.

Treatment with Test and Control Article s: Treatments were performed by combining 2 ml top agar (supplemented with 0.5mM histidine/0.5mM biotin), 0.1 ml tester strain, 0.5 ml of the S9 mixture and 0.1 ml test or control article or solvent in sterile glass tubes preheated to 4 5° C. The
S9 mixture contained 8mM MgCl 2 , 33mM KC1, 4mM NADP, 5mM glucose

- 6

- phosphate,
100mM NaH 2 PO 4 (pH 7.4) and 6% (v/v) Aroclor 1254

- induced male Sprague

- Dawley rat liver homogenate. The tubes were vortexed end the mixture was poured onto minimal glucose plates, evenly di stributed, and allowed to solidify. Within an hour the plates were inverted and
incubated in the dark at 37°C for 48

- 72 hours.

Bacterial Contaminant Evaluation: To ensure the sterility of solvents, compounds and equipment, standard contamination e valuatio ns were performed with the assay. The solvent, top

agar, S 9 mix, and top dose of the test article were evaluated at the same volumes used in the assay. The test article, solvent and S9 mix were evaluated as in the mutation assay, but in the
absence of adde d Salmonella

. Top agar alone was also plated on minimal glucose plates. A ll plating was done in triplicate. Plates were incubated for 48

- 72 hours at 37°C and then scored for bacterial growth.

Scoring: Following the 48

- hour incubation, the background l awn and spontaneous revertants were scored for normal, inhibited or no growth. Inhibited growth was characterized by the
absence of a confluent bacterial lawn and/or the presence of pindot colonies. Revertant colonies
were enumerated on an Artek electronic co lony counter interfaced with an Apple computer for
data acquisition. Solvent and positive controls were scored first, and test article treated cultures were scored only if the average negative control values were within historical ranges

.

RESULTS

Rev ertant frequencies for all doses of DETDA

- Low Color in all strains in the second assay approximated or were less than those observed i n the concurrent negative control cul tures

. In addition, all strains exhibited reduced revertant frequencies and background lawns at the 12,500

μ g/plate dose level, indicating this dose was moderately toxic.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): 12 500 μ g/plate

Results remarks: All positive and negative control values in both assays were within historical
limits.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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94 CONCLUSIONS

T he results for DETDA

- Low Color were negative in the Ames/ Salmonella Plate Incorporation Assay un der the conditions, and according to the criteria, of the test protocol.

STUDY RELIABILITY

[ 3 ] Not reliable

. This study is considered to be unreliable because only 3 bacterial strains were tested. In addition, i mportant study details were missing from the study summary provided and included purity and composition of the test substance.

REFERENCES

Stankowski, L., and Naismith, R. 1987 b . Ames/ Salmonella Plate Incorporation Assay with
DETDA

- Low Color Lot # 2

- 87. Report # PH 301

- ET

- 001

- 87. Performing Laboratory: Pharmakon Research International, Waverly, PA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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95 Study 19 : In vitro point mutation in mammalian cells ( Schechtman et al., 1982)

Title: Activity of diethyl toluenediamine (DETDA) in the in vitro mammalian cell point mutation assay in the absence of exogenous metabolic activation

This study is : Adequate Not Adequate

This study is not adequate because it did not indicate a test guideline, did not indicate the purity
and com position of the test substance and did not use at least four analyzable concentrations of test substance that produced a range of toxicity from maximum to little or no toxicity. Additionally, the cells that were tested (BALB/3T3 clone A31

- 1 mouse cells) a re not named in OPPTS 870.5300 as one of the cell lines suitable for detection of gene mutations in mammalian cells and the test substance was not tested in the presence of metabolic activation.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1 ; Synonym: Diethyltoluenediamine (DETDA)

Remarks: DETDA lot PP Run 162 assigned the code number T1829; purity not provided; viscous brown liquid in appearance

METHOD

Method/guideline followed: Not indicated

Test type: In vitro mammalian cell point mutation

GLP compliant?: Yes

Year study performed: 1982

Test species: BALB/3TC Clone A31

- 1 mouse cells

Metabolic activation: Without

Concentrations tested: 0.05, 0.17, or 0.5 μl/ml

Statistical methods used: The mutagenic potential of each treatment condition was compared to that of the solvent control using a special application of the Poisson distribution as follows:

The proportion (P) of all cells not subject to induced mutation is equal to the number of clonable cells in the solvent control group divided by the total of the clonable cells in the solvent control and treatment group. Significance is determined by:

P(X ≥n 1 /n) = (n!/(n 1 !(n

- n 1 )!)) (P n1 (1

- P) n

- n1 )Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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96 Where p is the probability, n is th e number of induced mutants, n 1 is the number of spontaneous mutants, and P is defined above. If p is very small (p ≤ 0.05) the hypothesis that the probability of a mutation event is the same for both the treated and control groups is rejected and the ind uced mutation frequency is considered significant at the p ≤ 0.05 level.

Test method/conditions remarks: Exponentially grown BALB/3T3 clone A31

- 1 cells were seeded for each treatment condition at approximately 2 x 10 6 cells/75 cm 2 flask and were incubated at 36oC in a humidified atmosphere
of 5% CO 2 in air for 20

- 24 hours.

The time of initiation of chemical treatment was designated as day 0. The test substance was dissolved in DMSO and then diluted with complete EMEM (Eagles Mini mal Essential medium supplemented with 10% fetal bovine serum, 1% L

- glutamine and 2% penicillin

- streptomycin). Cells were exposed to three concentrations of the test article as well as solvent and positive
controls for 24 hours at 36oC. Treatment was car ried out by adding 2X concentrations of test article, solvent, or positive control to an equal volume of complete EMEM in the flask. After the exposure period, all treatment media were withdrawn, the cells were washed once with HBSS, collected by trypsini zation, and subcultured to assess cytotoxicity and to initiate the phenotypic expression period.

For evaluation of cytotoxicity, cells from each treatment condition were subcultured in complete EMEM, in triplicate, at a density of 250 cells/dish. After 7

- 10 days incubation at 36oC, the colonies were fixed with methanol, stained with 10% aqueous Giemsa, and counted.

For expression of the mutant phenotype, cells from each treatment condition were subcultured in complete EMEM at a density of approximately 4 x 10 5 cells/150 cm 2 flask. After a 4

- 6 day expression period, selection for the mutant phenotype was performed.

For selection of the ouabain

- resistant phenotype, cells from each treatment conditions were replated, in replicates of 15 dishes, at a dens ity of 2 x 10 5 cells/60 mm dish in complete EMEM containing 1 mM ouabain. After 1

- 4 weeks, the mutant colonies were fixed, stained, and counted. For cloning efficiency at the time of selection, 250 cells/60 mm dish were plated, in triplicate, in selectio n medium without ouabain. After 7

- 10 days incubation at 36oC, the colonies were fixed, stained and counted for cloning efficiency.
Evaluation of Test Results

– The cytotoxic effects of each treatment condition are expressed
relative to the solvent

- treated control (relative cloning efficiency). The mutation frequency for each treatment condition is expressed as the number of mutant colonies per clonable cell. The confidence level associated with the number of clonable cells employed in the selection proce ss requires that the assumption be made that were more cells utilized for the selection of mutants, the possibility exists that at least one ouabain

- resistant mutant could be obtained. Therefore, for
test conditions in which no mutant colonies were observ ed, mutation frequencies are expressed as less than the frequency obtained with one mutant colony.

Criteria for Determination of a Valid Test

– The cloning efficiency of the solvent control must be greater than or equal to 15%. The relative survival of c ells exposed to the test article must be equal to or greater than 40% for at least one dose. The number of spontaneous ouabain

- resistantFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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97 mutant colonies in the solvent control must not exceed four colonies per total replicate dishes. The positive control must induce a significant (p ≤ 0.05) number of ouabain

- resistant mutant colonies relative to the negative control.

RESULTS

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): Relative to the solvent control, the cell survival was approximately 73%, 80%, and 84% at 0.5, 0.17, and 0.05 μ l/ml, respectively.

Results remarks: Cytotoxicity was observed. All tests were negative for the induction of
ouabain

- resistant colonies at a ll concentrations employed.

Following a 24 hour treatment of BALB/3T3 clone A31

- 1 cells with the test substance in the absence of an exogenous metabolic activation system, cell survival (relative to the solvent control) was approximately 73%, 80%, and 84% at 0.5, 0.17 and 0.05 μl /ml, respectively.

For the activity of test substance in the BALB/3T3 point mutation system after a 24 hour treatment in the absence of an exogenous metabolic activation system, no spontaneous ouabain

resistant mutant colonies were observed in the solvent con trol for a background mutation frequency of < 0.79 X 10 - 6 . No ouabain

- resistant mutant colonies were observed in the three treatment groups. The mutation frequencies of <0.83 X 10 - 6 , <0.81 X 10 - 6 and <0.85 X10 - 6 were not statistically increased (p>0.05) relative to the solvent control. MNNG induced 247 ouabain

resistant mutants for a mutation frequency of 217 X 10 - 6 which was statistically significant (p<0.01) to the solvent control.

CONCLUSIONS

The negative control and positive control fulfilled the requirements for determination of a valid

test.

Under the conditions of the assay described in this report, the data suggest that T1829 does not induce point mutations at the ouabain membrane receptor locus and should be considered negative in the BALB/3T 3 point mutation assay.

STUDY RELIABILITY

[3] Not reliable. The study did not indicate a test guideline, did not indicate the purity and composition of the test substance and did not use at least four analyzable concentrations of test substance that pro duced a range of toxicity from maximum to little or no toxicity. Additionally, the cells that were tested (BALB/3T3 clone A31

- 1 mouse cells) are not named in OPPTS 870.5300 as one of the cell lines suitable for detection of gene mutations in mammalian cel ls and the test substance was not tested in the presence of metabolic activation.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

98 REFERENCES

Schechtman, L., Putman, D., and McCarvill, J. 1982. Activity of diethyl toluenediamine (DETDA) in the in vitro mammalian cell point mutation assay in the absence of exogenous metabolic activation. Performing Laboratory: Microbiological Associates. Bethesda, MD. Sponsor: Ethyl Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

99 Study 2 0 : In vitro point mutation in mammalian cells ( Schechtman et al., 1979 )

Title: Activity of T1364A in in vitro mammalian cell point mutation assay in the presence of exogenous metabolic activation

This study is: Adequate Not Adequate

This study is not adequate because t he study did not indicate the test guideline(s) followed, GLP compliance and test substance purity and composition. Evidence was not provided, as stipulated by the OPPTS 870.5300 guideline for the In Vitro Mammalian Cell Gene Mutation Test, that the study used at least four analyzable concentrations that produced a range of to xicity from maximum to little or no toxicity or, alternatively, that the highest test concentration was 5 mg/L, 5μL/mL, or 0.01M, whichever is the lowest. Additionally, the cells that were tested, BALB/3TC Cl.A31 mouse cells, are not named in OPPTS 870.530 0 as one of the cell lines suitable for detection of gene mutations in mammalian cells and the test substance was not tested in the absence of metabolic activation. Furthermore, the test substance is identified as diethyltolueneamine, which differs from d iethyltoluenediamine (the subject of required testing); diethyltolueneamine is not an acceptable analog for diethyltoluenediamine.

TEST SUBSTANCE

Identity: Diethyltolueneamine

Remarks: Referred to as T1364A; brown liquid in appearance

METHOD

Method/guideline followed: Not indicated

Test type: In vitro mammalian cell point mutation

GLP compliant?: Not indicated

Year study performed: 1979

Test species: BALB/3T3 Cl.A31 mouse cells

Metabolic activation: With (Preliminary cytotoxicity evaluations were conducted with and without)

Concentrations tested: 1.1 x 10 4 , 1:1.5 x 10 4 , 1:2 x 10 4

Statistical methods used: Not indicatedFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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100 Test method/conditions remarks:

Prior to the use, an S

- 9 preparation is pre

- tested for metabolic capacity in terms of aryl hydrocarbon hydroxylase (AHH) activity by medication of published procedures.

Exponentially growing BALB/3T3 Cl.A31 cells were cultured in 75 cm 2 cell culture flasks and collected by trypsinization into 5 0 cc conical tubes for treatment in suspension at 37oC for 2 hours in a buffer pool (reaction mixture) containing an NADPH

- generating system. The
treatment conditions were as follows:

a. Cells + S

- 9 mix + Benzo(a)pyrene (BP), 12.5 μ g/ml (positive control)
b. Cells + S

- 9 mix ± Dimethylsulfoxide (DMSO) (vehicle/negative control)
c. Cells + S

- 9 mix + test chemical (3 doses)

After the exposure period, the target cells were washed and resuspended in complete growth medium (basal medium, Eagle) containi ng 10% heat

- inactivated fetal bovine serum. Cell samples from each test condition were seeded at 250 cells per 60 mm dish in triplicate, to determine the cytotoxic effects of each treatment. After 7

- 10 days at 37oC, the cells were fixed
with 100% methano l, stained with 10% aqueous Giemsa, and scored for the number of surviving colonies in order to determine the relative plating efficiencies (RPE) according to the protocol of Schechtman and Kouri (Appendix A).

The remaining cells for each test condition were cultured further (in 150 cm 2 cell culture flasks)
at 37oC for a 4

- 6 days expression period necessary for fixation of the mutagenic event. Cell samples were then collected and reseeded at 250 cells per 60 mm dish in triplicate, to determine their RPE, in order to establish the number of cells at risk (CAR) to the selective agent, ouabain.
After 7

- 10 days at 37oC, the cells were fixed, stained and scored as described above.

For determination for mutation induction, cells from each test condition colle cted post

expression period were also seeded at 2 X 10 5 cells per 60 mm dish, approximately 15 dishes per condition, and incubated at 37oC for 4 hours. One ml of 5mM ouabain was then added to each dish, resulted in a final concentration of 1 mM ouabain. Plates were incubated at 37oC with scheduled medium changes containing 1 mM ouabain, over a 4

- 6 week period. Cells were then fixed, stained and scored for the development of ouabain

- resistant colonies, according to the protocol of Schechtman and Kouri (Ap pendix B).

The results of the mutation assays are expressed in terms of the number of ouabain

- resistant mutants per number of CAR, or as the total number of ouabain

- resistant mutant colonies per
condition.

A preliminary cytotoxicity study was conducted t o determine the dose range to be employed in the mutagenesis assay. The detailed protocol for this cytotoxicity assay is included as Appendix C. Wherever possible, the approximate LD 50 concentration of the test chemical plus 1 dose
above and 1 dose below the LD 50 were those used in the assay.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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101 Appendix A Standard Protocol for the Determination of the Cytotoxic Effects of Test Chemicals to BALB/3T3 Cl. A31 Mouse Cells in the Presence of Exogenous Metabolic Activation: Suspension Assay

1. Two

- 3 x 10 6 log arithmically growing BALB/3T3 Cl. A31 cells (1) from sub

- confluent stock cultures are collected into 50 cc capacity conical centrifuge tubes (two tubes per treatment condition) and centrifuged at 1000 RPM for 10 min at 4 C.

2. The supernatants are discard ed and the cell pellets are resuspended in 4 ml reaction mixture consisting of the S

- 9 mix (containing 100 μl S

- 9 (approximately 40 mg protein/ml) and cofactor pool) ± test chemical. The test conditions include:
a. Cells + S

- 9 mix + BP, 12.5 (positive co ntrol)
b. Cells + S

- 9 mix ± solvent vehicle (negative control)
c. Cells + S

- 9 mix + test chemical

Final concentrations of the test chemical employed are those used in the accompanying mutation/transformation assay. 3. The tubes containing each reaction mixture are incubated for 2 hr at 37C in a humidified atmosphere of 5% CO 2 + air. The reaction is terminated by centrifugation at 1000 RPM for 10
min at 4C.

4. The cell supernatants are discarded; the cell pellets are resuspended for washing in Hanks’ balanced salt solution and then centrifuged at 1000 RPM for 10 min at 4C.

5. The cell supernatants are discarded and the cell pellets are resuspended in growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum. A cell count is then taken on the cells pooled for each test condition.

6. Cells are seeded at 250 cells per 60 mm dish in triplicate dishes per condition, in 5 ml growth
medium and incubated at 37C.

7. The medium in all plates is replaced every 3

- 4 days for the dura tion of the assay.

8. The plates are fixed (methanol, 100%) stained (Giemsa, 10% aqueous) and scored 7

- 10 days after initiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded), and/or relative colony

- forming efficiency (RCE) (i.e. number of colonies in chemically treated dishes relative to the number of colonies in solvent

treated controls).

Appendix B Standard Protocol for the Mutagenesis of BALB/3T3 Cl. A31 Mouse Cells at the Ouabain

Resistance Locus (Oua R ) in the Presence of Exogenous Metabolic Activation: Suspension AssayFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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102 1. Two

- 3 x10 6 logarithmically growing BALB/3T3 Cl. A31 cells (1) from sub

- confluent stock cultures are collected onto 50 cc capacity conical centrifuge tubes (two tubes per treatment condition) and centrifuged at 1000 RPM for 10 min at 4 C.

2. The supernatants are discarded and the cell pellets are resuspended in 4 ml reaction mixture consisting of the S

- 9 mix (containing 100 μ l S

- 9 (approximately 40 mg protein/ml ) and cofactor pool) ± test chemical. The test conditions include:

a. Cells + S

- 9 mix + BP, 12.5 μ g/ml (positive control)
b. Cells + S

- 9 mix ± solvent control (negative control)
c. Cells + S

- 9 mix + test chemical (3 doses)

The doses of test chemical use d shall be based upon the results obtained in a preliminary cytotoxicity assay, and shall include, whenever possible, the approximate LD50, one dose above and one dose below the LD50. (The LD50 is that dose which is lethal to 50% of the target cells.)
If an agent is non

- toxic, then the highest dose that will be used will be a function of the limits of solubility of the test agent.

3. The tubes containing each reaction mixture are incubated for 2 hr at 37 C in a humidified atmosphere of 5% CO 2 + air. The reaction is terminated by centrifugation at 1000 RPM for 10
min at 4 C.

4. The cell pellets are resuspended for washing in Hank’s balanced salt solution and then centrifuged at 1000 RPM for 10 min at 4C.

5. The cell supernatants are discarded and the cell pellets are resuspended in growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum. A cell count is then taken on the cells pooled for each test condition.

6. Cytotoxicity assay plates (derived from each test condition ) are seeded at 250 cells per 60 mm dish, in triplicate dishes per condition in 5 ml growth medium to determine the cytotoxic effects of each treatment. Plates are incubated at 37 C. The medium is replaced every 3 days for 7

- 10 days, after which the cell s are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and scored for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded).

7. The remaining cells from each test condition are seeded into 150 cm 2 tissue cul ture flasks (~5
x 10 5 cells/flask) in 25 ml growth medium, and are incubated at 37C for 4

- 6 days (with medium changes every 3 days). This is the period of time required for fixation and expression of the mutagenic event.

8. After the expression period, t he cells from each test condition are collected by trypsinization (using 0.25% trypsin), suspended in growth medium, pooled and counted.

9. Cells are reseeded at 250 cells per 60 mm dish, in triplicate dishes per condition in 5 ml growth medium to determi ne their RPE, in order to establish the number of cells at risk (CAR) toFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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103 the selective agent (which discriminates mutant cells). These dishes are handled as described in step #6 above.

10. For mutagenesis determinations, 2 x 10 5 cells per 60 mm dish are seeded, approximately 15 dishes per condition, in 4 ml growth medium. Plates are incubated at 37 C for 4 hr.

11. One ml of 5 mM ouabain is added to each dish to give a final concentration of 1 mM ouabain. (Ouabain is a steroid which serves as the select ive agent for discriminating mutant
ouabain

- resistant colonies.) Plates are incubated at 37 C for 12 days.

12. The medium in the mutagenesis plates is then replaced once each week with fresh growth medium containing 1 mM ouabain for 3

- 4 weeks.

13. Cells are fixed, stained and scored for the development of mutant ouabain

- resistant colonies.

14. Mutation frequency (MF) data can be expressed in one of two ways: either (a) as the number
of ouabain

- resistant mutants per number of cells at risk to the selecti ve agent (which is a function of the RPE), or (b) as the total number of ouabain

- resistant mutants per condition. Appendix C Standard Protocol for the Determination of the Cytotoxic Effects of Test Chemicals to BALB
3T3 Cl. A31 Mouse Cells in the Absence o f Exogenous Metabolic Activation: Plate Assay

1. BALB 3T3 Cl. A31 cells from sub

- confluent stock cultures are seeded at 2 different cell densities (250 and 500 cells per 60 mm dish) in triplicate dishes per condition, in 4 ml growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum, and incubated at 37 C in a humidified atmosphere of 5% CO 2 + air.

2. Twenty

- four hours later, 2X concentrations of test chemical (6 doses) or solvent vehicle (negative control) are added 1:1 (v/v) to the seeding medium; cells are incubated for 24 hr at 37
C.

3. Final concentrations of test chemical to be tested initially will cover a dose range from 30

- 0.1

μ g/ml in approximate half

- log dilutions. However, if desirable, the highest dose to be test ed will be determined by the limits of solubility of the test agent.

4. After a 24 hour exposure period, the treatment medium is withdrawn; cel ls are washed once
with Hanks’ balanced salt solution (pH 7.0) and resupplied with 5 ml fresh growth medium.

5. The medium in all plates is replaced every 3

- 4 days for the duration of the assay.

6. The plates are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and scored 7

- 10 days after initiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded) and relative colony

- forming efficiency (RCE) (i.e. number of colonies in chemically

- treated dishes relative to the number of colonies in solvent

- treated controls).Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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104 7. The approximate LD 50 is determ ined from the relative survival data. The LD 50 is that dose of test chemical which is lethal to 50% of the target cells.

RESULTS

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): Concentrations ≤ 1:1.15 x 10 4 were extremely cytotoxic in the preliminary cytotoxicity evaluations. Relative survival for the concentrations used in the mutagenicity assay (in the presence of metabolic activation) was 43.1%, 89.9% and
101.9% at 1:1 x 10 4 , 1:1.5 x 10 4 and 1:2 x 10 4 , r espectively.

Results remarks: Under the conditions of the preliminary cytotoxicity study (Appendix C), compound T1364A was extremely cytotoxic to the target cells. The test agent was 100% cytotoxic at all of the concentrations tested although a few sing le cells were observed at the 1:1000 dilution; however, no colony formation was observed. Compound T1364A precipitated heavily at all of the concentrations tested.

In an additional preliminary cytotoxicity assay utilizing revised dilutions, T1364A was ob served to be 100% cytotoxic at the 1:1 x 10 3 , 1:2 x 10 3 and 1:3 x 10 3 dilutions. Although cell survival and colony formation was observed at the 1:5 x 10 3 dilution, the relative survival of the target cells at this concentration was judged to be too low t o be used in the mutation assay.

These results necessitated an additional cytotoxicity assay which would serve to estimate the approximate LD 50 of the test compound in the presence of exogenous metabolic activation. Although quantitative results (i.e. colony formation, RPE) were not established, a qualitative estimation of the relative toxicity of test agent to the target cells expressed in term s of (%) relative survival after treatment could be established. Under these conditions, compound T1364A was again observed to be extremely cytotoxic, even at a 1:1 x 10 4 dilution (relative
survival ≤ 10%). A dramatic decrease in the level of toxicity wa s observed at dilutions ≥ 1:1.5 x
10 4 . The observed cellular response made it difficult to establish an LD50 for test agent T1364a. Therefore, the mutagenesis assay (and its accompanying cytotoxicity assay) was performed using
these same doses in order t o bracket the LD 50 range.

Under the conditions of the quantitative cytotoxicity study which accompanied the mutagenesis assay (Appendix A), an approximate LD 60 was observed at the 1:1 x 10 4 dilution of test compound T1364A in the presence of exogenously s upplied S

- 9. Little or no toxic effects were observed at the other doses of T1364A employed.

Under the conditions of the mutagenesis assay, no ouabain

- resistant colonies were observed at any of the doses of T1364 tested. No spontaneous mutant colonies w ere induced among cells in the negative control (S

- 9 + buffer). In the presence of S

- 9, BP (the positive control chemical)
induced 20 ouabain

- resistant colonies per 0.58 x 10 6 cells at risk.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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105 CONCLUSIONS

While the positive control was seen to induce ouab ain

- resistant colonies, the test substance did not, even at concentrations that were not cytotoxic. Therefore, the test substance was negative for mutation in this assay. Additional information is needed to determine if it was negative
without metabolic activation.

STUDY RELIABILITY

[3] Not reliable. The study did not indicate the test guideline(s) followed, GLP compliance and test substance purity and composition. Evidence was not provided, as stipulated by the OPPTS 870.5300 guideline for the In Vitro Mammalian Cell Gene Mutation Test, that the study used at least four analyzable concentrations that produced a range of toxicity from maximum to little or no toxicity or, alternatively, that the highest test concentration was 5 mg/L, 5μL/mL, or 0. 01M, whichever is the lowest. Additionally, the cells that were tested, BALB/3TC Cl.A31 mouse cells, are not named in OPPTS 870.5300 as one of the cell lines suitable for detection of gene
mutations in mammalian cells and the test substance was not tested in the absence of metabolic
activation. Furthermore, t he test substance is identified as diethyltolueneamine, which differs from diethyltoluenediamine (the subject of required testing); diethyltolueneamine is not an acceptable analog for diethyltoluenedia mine.

REFERENCES Schechtman, L., Beard, S., and Sinsky, P. 1979. Activity of T1364A in in vitro mammalian cell point mutation assay in the presence of exogenous metabolic activation. Performing Laboratory: Microbiological Associates. Bethesda, MD. Sponsor : Ethyl Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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106 Study 21 : In vitro point mutation in mammalian cells ( Schechtman et al., 1978)

Title: Activity of DETA in in vitro mammalian cell point mutation assay

This study is: Adequate Not Adequate

This study is not adequate because t he study did not indicate the test guideline(s) followed, GLP compliance , and test substance purity and composition. Additionally, the cells that were tested, BALB/3TC Cl.A31 mouse cells, are not named in OPPTS 870.5300 as one of the cell lines suitable for detection of gene mutations in mammalian cells and the test substance was not tested in the presence of metabolic activation.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

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- 1 ; Synonym: Diethyltoluenediame (DETDA)

Remarks: Referred to as “ DETA ”

, identified as “diethyltoluenediamine”, compound lot number designated as X

- 9782; brown liquid in appearance

METHOD

Method/guideline followed: Not indicated

Test type: In vitro mammalian cell point mutation

GLP compliant?: Not indicated

Year study performed: 1978

Test species: BALB/3TC Cl. A31 mouse cells

Metabolic activation: Without

Concentrations tested: Not indicated

Statistical methods used: Not indicated

Test method/conditions remarks: Exponentially growing BALB/3T3 Cl. A31 cells were cultured in 75 cm 2 Falcon flasks and collected by trypsinization. Cells were seeded in triplicate dishes per condition at densities of 250 and/or 500 cells per 60 mm dish for determination of the relative cytotoxic effects of each treatment and 1 x 1 0 4 cells per 60 mm dish in ~ 15 replicate dishes per condition for determination of the mutation frequency. All cells were seeded in 4 ml complete growth medium.

Twenty

- four hours after the cells were seeded, a twice concentrated working solution of the test chemical (3 doses) or the positive or negative controls were added 1:1 (v/v) to the medium inFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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107 each dish; cells were then incubated for 24 hours at 37oC. After the exposure period all treatment media were withdrawn and the target cells were washed onc e with Hanks’ Balance Salt Solution (HBSS) supplemented with 5% fetal bovine serum. Thereafter the cells were replenished with 5 ml complete growth medium. The medium was changed once during the expression period (of 5 days).

Six days after the initiati on of the experiment, the dishes which were initially seeded with 1 x 10 4 cells were treated with medium containing 1 mM ouabain for selection of resistant mutant colonies developing over 25

- 30 days.

Cells were fixed with 100% methanol and stained with 10 % aqueous Giemsa after 8

- 10 days for cytotoxicity and plating efficiency (cells at risk) determinations, according to the protocol of Schechtman and Kouri (Appendix A), and at 25

- 30 days for determination of the number of mutant colonies in each dish, acco rding to the protocol of Schechtman and Kouri (Appendix B). Plating efficiencies are expressed as the percent of the number of surviving colonies per dish relative to the number of cells seeded per dish. Mutation results are designated in terms of
mutati on frequencies and are expressed as the number of ouabain

- resistant mutants per number
of cells at risk to ouabain.

A preliminary cytotoxicity study was conducted to determine the dose range to be employed in the mutagenesis assay. The detailed protocol for this cytotoxicity assay is included as Appendix A. Wherever possible, the approximate LD 50 concentration of the test chemical plus 1 dose
above and 1 dose below the LD 50 were those used in the assay. Cell culture (growth) medium, acetone, or DMSO, the solvent vehicle, served as the negative control; 3

- MC or MNNG was used as the positive control.

APPENDIX A Standard Protocol for the Determination of the Cytotoxic Effects of Test Chemicals to BALB 3T3 CL. A31 Mouse Cells in the Absence of Exogenous Metabolic Activation: Plate Assay

1. BALB 3T3 Cl. A31 cells from sub

- confluent stock cultures are seeded at 2 different cell densities (250 and 500 cells per 60 mm dish) in tri plicate dishes per condition, in 4 ml growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum, and incubated at 37 C in a humidified atmosphere of 5% CO 2 + air.

2. Twenty

- four hours later, 2X concentrations of test chemical (6 doses) or solvent vehicle (negative control) are added 1:1 (v/v) to the seeding medium; cells are incubated for 24 hr at 37
C.

3. Final concentrations of test chemical to be tested initially will cover a dose range from 30

- 0.1

μ g/ml in approximate half

- log dilutions. However, if desirable, the highest dose to be tested will be determined by the limits of solubility of the test agent.

4. After a 24 hour exposure period, the treatment medium is withdrawn; cells are washed once
with Hanks’ balanced s alt solution (pH 7.0) and resupplied with 5 ml fresh growth medium.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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108 5. The medium in all plates is replaced every 3

- 4 days for the duration of the assay.

6. The plates are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and scored 7

- 10 days
after i nitiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded) and relative colony

- forming efficiency (RCE) (i.e. number of colonies in chemically

- treated dishes relative to the number of co lonies in solvent

- treated controls).

7. The approximate LD50 is determined from the relative survival data. The LD50 is that dose of test chemical which is lethal to 50% of the target cells.

APPENDIX B Standard Protocol for the Mutagenesis of BALB 3T3 C l. A31 Mouse Cells at the Ouabain

Resistance Locus (Oua R ) in the Absence of Exogenous Metabolic Activation: Plate Assay

1. BALB 3T3 Cl. A31 cells from sub

- confluent stock cultures are seeded at 3 different cell densities (250

- 500 cells per 60 mm dish, in triplicate dishes per condition, for cytotoxicity tests;
1 x 10 4 cells per 60 mm dish, 15 dishes per condition, for mutation tests) in 4 ml growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum, and incubated at 37C
in a hu midified atmosphere of 5% CO 2 + air.

2. Twenty

- four hours later, 2x concentrations of potential mutagen (i.e. test chemical (3 doses), or positive control chemical) or solvent vehicle (negative control) are added 1:1 (v/v) to the seeding medium; cells are incubated for 24 hr at 37 C. The doses of test chemical used shall be based upon the results obtained in a preliminary cytotoxicity assay, and shall include the approximate LD50, one dose above and one dose below the LD50. If an agent is non

- toxic, then the highest dose that will be used will be a function of the limits of solubility of the test agent.

3. Treatment medium is withdrawn; cells are washed once with Hanks’ balanced salt solution (pH 7.0) and resupplied with 5 ml fresh growth medium.

4. The medium in the cytotoxicity plates is replaced every 3 days for 7

- 10 days, after which the cells are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and scored for relative planting efficiency (RPE) (i.e. number of surviving colonies per number of ce lls seeded). These data establish the cytotoxic effects of the 24 hr treatment with the test chemical.

5. The medium in the mutagenesis test plates is replaced every 3 days until day 6 of the assay (the period of fixation and expression of the mutagenic event.)

6. On day 6 of the assay, the cells in two representative mutagenesis test plates are counted to establish the number of cells at risk (CAR) to the selective agent (which discriminates mutant cells).

7. The medium in the remaining mutagenesis tes t plates is replaced with fresh growth medium containing 1mM ouabain (a synthetic steroid which serves as the selective agent).Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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109 8. The plates are incubated for 12 days at 37 C. Thereafter the growth medium containing 1 mM ouabain is changed once each week for 3

- 4 weeks.

9. Cells are fixed, stained and scored for the development of mutant ouabain

- resistant colonies.

10. Mutation frequency (MF) data can be expressed in one of two ways: either (a) as the number
of ouabain

- resistant mutants per number o f cells at risk to the selective agent, or (b) as the total
number of ouabain

- resistant mutants per condition.

RESULTS

Genotoxicity result: Positive

Cytotoxic concentration (if applicable): Relative survival at 1:10000, 1:15000, 1:2000, 1:3000 (0.1, 0.07, 0.05, 0.33 μl/ml) was 0.69%, 21.40%, 30.00% and 42.8%, respectively.

Results remarks: In the preliminary study, a dose response was not observed due to the extreme toxicity of DETDA to the target cells. The test agent was 100% cytotoxic at all of the concentrations tested although a few single cells were observed at the 1:1000 dilution; however, no colony formation was observed. Compound DETDA precipitated heavily at all of the
concentrations tested.

In an additional preliminary study using revised dilutions, DETDA was observed to be 100% cytotoxic at the 1:1000, 1:2000 and 1:3000 dilutions. Although cell survival and colony formation was observed at the 1:5000 dilution, the relative survival of the t arget cells at this concentration was judged to be too low to be used in the transformation assay.

In the cytotoxicity study which accompanied the mutagenesis assay, a dose response was observed. Although DETDA was virtually 100% cytotoxic at the 1:10000 dilution (0.69% relative survival), the (%) relative survival at the 1:15000, 1:20000, and 1:30000 dilutions was found to be acceptable for the completion of the mutagenesis assay. The approximate LD 40 was found to be at the 1:30000 dilution of compound DETDA

.

In the mutagenesis assay, DETDA was effective in inducing ouabin

- resistant colonies at all of
the doses tested. The numbers of ouabain

- resistant colonies observed at the 1:10,000 and 1:15,000 dilutions are statistically significant relative to the medium control. However, the
number of ouabain

- resistant colonies observed at the 1:20,000 and 1:30,000 dilutions are not statistically significant relative to the medium control. No spontaneous mutant colonies were induced among cells in the medium con trol (negative control). MNNG (the positive control chemical) induced 20 ouabain

- resistant colonies per 6.5 x 10 6 cells at risk.

.

CONCLUSIONS

Based on the results and discussion the following conclusions were made: (1) DETDA was found to be extremely cy totoxic to the BALB/3T3 Cl. A31 calls. (2) DETDA precipitated in the complete medium at all dilutions tested <1:10000. (3) A dose response was observed onlyFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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110 among dilutions tested >1:10000. (4) Under the conditions of the bioassay, the test chemical
DET DA was demonstrated to be positive in producing ouabain

- resistant colonies at all concentrations tested. Relative to the medium control (negative control), the numbers of mutant colonies induced by the 1:10000 and 1:15000 dilutions of test chemical were s tatistically significant (p<0.05). The numbers of mutant colonies observed at the 1:20000 and 1:30000 dilutions of test chemical were not statistically significant (p>0.05) relative to the medium control (negative control).

STUDY RELIABILITY

[3] Not reliable. The study did not indicate the test guideline(s) followed, GLP compliance, and test substance purity and composition. Additionally, the cells that were tested, BALB/3TC Cl.A31 mouse cells, are not named in OPPTS 870.5300 as one of the c ell lines suitable for detection of gene mutations in mammalian cells and the test substance was not tested in the presence of metabolic activation.

REFERENCES

Schechtman, L., Beard, S., and Fabrizio, D. 1978. Activity of DETA in in vitro mammalian cell point mutation assay. Performing Laboratory: Microbiological Associates. Bethesda, MD. Sponsor: Ethyl Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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111 C

- 7 . Genetic Toxicity

– Chromosomal Aberrations: Test Requirement (E2) under Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Adequate

Study 1: Chromosomal aberrations study in human lymphocytes ( Durward
, 2000 )

Title: LZ1224.20: Chromosome Aberration Test in Human Lymphocytes in vitro

The study is: Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym s : Diet hyltoluenediamine (DETDA), DETDA 80; Purity: 98.4%; Composition of test material: 77.6% 3,5

- diethyltoluene

- 2,4

- diamine (GC), 20.8% 3,5

- diethyltoluene

- 2,6

- diamine (GC); Impurities: 0.4% ethyl toluenediamine (GC), < 0.0150% toluenediamine (GS), 0.02% (w/w)

water

Remarks: Clear liquid; Batch No. 2235

METHOD

Method/guideline followed: OECD 473

Test type: In v itro mammalian chromosomal aberration test

GLP compliant?: Yes

Year study performed: 1999

- 2000

Test species: Human lymphocytes

Metabolic activation: With and without

Concentrations tested: 0 (negative control); 0 ( DMSO vehicle control); Preliminary toxicity

test: 7 to 1800 μg/mL (with and without S9); Experiment 1: 450 to 1800 μg/mL (with and without S9); Experiment 2: 112.5 to 337.5 μg/mL (with out S9)

, 450 to 1800 μg/mL (with S9) ; Experiment 3 : 1400 to 1800 μg/mL (with S9)

Statistical methods used: Fisher’s exact test, chi

- squared test

Test method/conditions remarks: Duplicate lymphocyte cultures (A and B) were established
for each concentration level.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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112 A preliminary toxicity test was performed on cell cultures using a 4

- hour exposure with and without metabolic activation followed by a 20

- hour recovery period and a continuous exposure of 24 hours without metabolic activation. The concentration range of t est material used was 7 to 1800 μg/mL. Using a qualitative microscopic evaluation of the slides prepared from the treatment cultures, appropriate concentration levels were selected for mitotic index evaluation.
Mitotic index data were used to estimate th e test material toxicity and select concentration levels for the main study in which vehicle and positive controls were used in parallel with the test
material.

Experiment 1: Four

- hour exposure s to DETDA were conducted with or without S9 , followed by
20

- hour culture in treatment

- free media prior to cell harvest. After mitotic index determination,
the concentration levels selected for metaphase analysis were: 450, 900, and 1800 μg /mL

.

Experiment 2 : Twenty

- f our hour continuous exposures to DETDA without S9 were conducted prior to cell harvest. After mitotic index determination, the concentration levels selected for metaphase analysis were: 112.5, 225 , and 337.5 μg /mL

. Four

- hour exposure to DETDA with S9 was conducted, followed by 20

- hour culture in trea tment

- free media prior to cell harvest. After mitotic index determination, the concentration levels selected for metaphase analysis were: 450, 900, 1350, and 1800 μg/mL.

Experiment 3: Four

- hour exposure s to DETDA with S9 (either 2% or 5% final concentration)
were conducted , followed by 20

- hour culture in treatment

- free media prior to cell harvest. After mitotic index determination, the concentration levels selected for m etaphase analysis were: 1400 and 1800 μg/ mL

.

Cell Harvest: Mitosis was arr ested by addition of demecolcine two hours before the required harvest time. The cells were resuspended in hypotonic KCl, fixed in methanol/glacial acetic acid,
and stained in Gurr’s Giemsa. The slides were screened microscopically for the quality of the metaphase ( i.e. well spread, undamaged, perfectly stained ) and were coded randomly. A total of 2000 lymphocyte cell nuclei were counted and the number of cells in metaphase recorded and expressed as the mitotic index and as a percentage of the vehicle con trol value. A positive response was recorded for a particular treatment if the percentage of cells with aberration, excluding gaps, markedly exceeded that seen in the concurrent control, either with or without a clear concentration relationship. For mode st increases in aberration frequency, a concentration

response relationship was required and an appropriate statistical test was applied in order to record a positive response. The frequency of cells with aberrations (both including and excluding gaps) an d the frequency of polyploidy cells were compared, where necessary, with the concurrent vehicle control value using Fisher’s exact and chi

- squared tests.

Vehicle Used?: Yes

Vehicle Name: DMSO

Positive Control Substances: Without metabolic activation: ethylmethanesulphonate (Experiment 1) and mitomycin C (Experiment 2). With metabolic activation: cyclophosphamide.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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113 RESULTS

Genotoxicity result: Negative without metabolic activation; equiv ocal with metabolic
activation

Cytotoxic concentration (if applicable) : Not clearly defined; see “results remarks” section.

Results remarks:

Preliminary Toxicity Test: DETDA induced toxicity in all three treatment groups: (1) 4

- hour treatment, 20

- hour recovery without S9; (2) 4

- hour treatment, 20

- hour recovery with S9; (3) 24

- hour treatment without S9. The response was more pronounced in the c ontinuous exposure cultures without S9. No DETDA precipitate was observed. Microscopic assessment of the slides prepared from the treatment cultures showed that metaphase cells were present up to the 10 mM limit concentration of DETDA (1800 μg/mL) in the pulse treatment with and without S9, and up to 450 μg/mL in the 24

- hour continuous treatment without S9.

Experiment 1: DETDA did not induce any statistically significant increases in the frequency of
cells with chromosomal aberrations either in the abs ence or presence of metabolic activation. However, a concentration

- related trend was observed when gap

- type aberrations were taken into account. DETDA induced a significant increase in the numbers of polyploid cells in the absence
of S9 at 1800 μg/mL, an d in the presence of S9 at 900 μg/mL.

A concentration

- related inhibition of mitotic index was observed such that 42% mitotic inhibition was achieved at 1800 μg/mL in the absence S9. In the presence of S9, the
concentration

- related response was not pronounced and only 23% mitotic inhibition was achieved at the maximum concentration level, 1800 μg/mL.

Experiment 2: DETDA induced a statistically significant concentration

- response increase in the frequency of cells with chromosome aberrations in the pr esence of S9. A similar response was not observed in Experiment 1. However, the final S9 concentration was increased from 1% to 2%, which may explain the different qualitative responses seen in the two experiments. DETDA induced a significant increase i n the number of polyploid cells at 900 μg/mL in the presence of S9, confirming the response seen in Experiment 1.

DETDA induced a concentration

- related inhibition of mitotic index such that a near optimum of 52% mitotic inhibition was achieved at 337.5 μg /mL in the absence of S9. The 87% inhibition observed at 450 μg/mL (with S9) was considered to be too excessive for that concentration level to be included in the metaphase analysis. In the presence of S9, the concentration

- related response was less clea r; in the concentration levels that were assessed, mitotic inhibition was induced to a maximum of 41% of the control value at 1800 μg/mL.

Experiment 3: DETDA did not induce any statistically significant increases in the frequency of
cells with chromosom e aberrations excluding gap

- type aberrations either in the 2 or 5% final S9 concentration treatment groups. However a significant increase was seen when gap

- type aberrations were included at 1800 μg/mL in the 5% S9 treatment group. The response seen inFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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114 E xperiment 2 was not reproduced in the 2% S9 treatment group, and only a gap

- type response was observed in the 5% final S9 concentration group. However, an unavoidable difference between Experiment 2 and Experiment 3 was that a different batch of S9 was us ed with a slightly reduced protein content. DETDA induced a significant increase in the numbers of polyploidy cells at the 1800 μg/mL concentration level in the 2% S9 concentration treatment group; confirming the responses seen in both Experiment 1 and 2. The polyploidy cells observed were primarily endoreduplicated cells in all three experiments.

DETDA induced a concentration

- related reduction in mitotic index using both S9 concentrations, such that 45% mitotic inhibition was achieved at 1800 μg/mL in 2% S9 cultures, and 52% mitotic inhibition was seen at 1800 μg/mL in the 5% S9 cultures. The positive control treatments performed as expected. All the vehicle control cultures had frequencies of cells with chromosome aberrations within the expected rang e.

CONCLUSIONS

The test material induced no statistically significant increase in the frequency of cells with aberrations (excluding gaps) in the first experiment. However, in the second experiment, an
increase was observed with metabolic acti vation (2% S9), which was not clearly concentration

related. This response was not reproduced in the third experiment using 2% or 5% S9 , but different S9 preparations were used in the second and third experiments. A small statistically significant increa se in the frequency of cells with aberrations including gaps was also observed in the 5% S9 group of the third experiment . Small increases in polyploid cell frequency, both in the absence and presence of S9

, were also noted. There was equivocal evidence for a clastogenic effect on human lymphocytes of DETDA in the presence of metabolic activation, but no evidence for a clastogenic effect in the absence of metabolic activation.

STUDY RELIABILITY

[2] Reliable with restriction s

. The r eport was supplied as a n IUCLID summary and important details were missing including quantitative data on the number of cells with chromosomal aberrations and types of chromosomal aberrations for control and treated cultures.

REFERENCE

Durward, R. 2000. LZ1224.20: Chromosome Aberration Test in Human Lumphocytes in Vitro, SPL Project Number: 102/300. Study No. 2077. Performing Laboratory: SafePharm Laboratories, Ltd. Shardlow, Derbyshire. Sponsor: Lonza Limited, Basle, Switzerland. (C ited
as Durwood [2000] in summary submitted by Albemarle and Lonza on March 1, 2012)Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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115 Study 2 : Micronucleus study in mice ( Durward and Nolan
, 2000 )

Title: LZ1224.20: Micronucleus Test in the Mouse

The study is: Adequate Not Adequate

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym s : Diet hyltoluenediamine (DETDA), DETDA 80; Purity: 98.4%; Composition of test material: 77.6% 3,5

- diethyltoluene

- 2,4

- diamine (GC), 20.8% 3,5

- diethyltoluene

- 2,6

- diamine (GC); Impurities: 0.4% ethyl toluenediamine (GC), < 0.0150% toluenediamine (GS), 0.02% (w /w)

water

Remarks: Amber slightly viscous liquid; Batch No. 2235

METHOD

Method/guideline followed: OECD 474

Test type: Mouse erythrocyte micronucleus test

GLP compliant?: Yes

Year study performed: 2000

Test species: ICR mice (5

- 8 weeks old, 25

- 30 g both sexes combined)

Number of animals/sex/dose: 2/sex/dose (preliminary range

- finding toxicity test); 7 males/dose (micronucleus test)

Route of administration : Oral gavage

Vehicle: Arachis oil

Metabolic activation: N/A

Doses tested: 0 (DMSO vehicle control), 125, 250, or 500 mg/kg

- bw test material; 50 mg/kg

bw cyclophosphamide (positive control).

Statistical methods used: Student’s “t” test , One way Analysis of Variance

Test method/conditions remarks: In a preliminary dose

- range study, groups of 2 male and 2 female mice were dosed with DETDA at concentrations of 300, 450

, or 600 mg/kg

- bw

. Based
on the results of the dose

- range

- finding study, the DETDA dose levels selected for the

m icronucleus t est were 125, 250, and 500 mg/kg

- bw

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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116 In the m icronucleus t est, DETDA was administered via a single oral gavage dose to groups of 7 male mice at doses of 125, 250

, or 500 mg/kg

- bw. One group of mice from each dose level was sacrificed 24 hours following treatme nt, and a second group dosed at 500 mg/kg

- bw at 48 hours. Cyclophosphamide served as a positive control (50 mg/kg

- bw) for a group of 7 mice, and the vehicle, arachis oil

, served as the negative control for two groups of mice (n = 7/group). The
vehicle co ntrols were sacrificed 24 or 48 hours following dosing and positive control group animals were sacrificed 24 hours following dosing. Immediately following sacrifice, marrow was aspirated from the femurs and used to prepare microscopic slides for evaluatio n following May

- Grunwald/Giemsa staining

.

Incidences of micronucleated cells were determined in 2000 polychromatic erythrocytes (PCE) per animal. In addition, incidences of normochromatic erythrocytes (NCE) per 1000 erythrocytes were determined and the N CE also were scored for incidences of micronuclei. The PCE/NCE ratio was calculated together with appropriate group mean values and standard deviation. A comparison was made between the number of micronucleated PCE occurring in
each of the test material groups and the number occurring in the corresponding vehicle control

group. Results we re analyzed acco rding to the Student’s “t” test and any significant results were confirmed using the one way analysis of variance.

RESULTS

Genotoxicity result: Negative

Cytotoxic dose: Not indicated

Results remarks: Preliminary Range

- Finding Toxicity Test: Premature death occurred at 600 mg/kg

- bw and clinical signs were observed at and above 300 mg/kg

- bw, as follows: lethargy, hunched posture, ptosis, decreas ed respiratory rate, labored respiration, ataxia, and splayed gait.

DETDA showed no marked difference in its toxicity to male or female mice. Therefore, males were used for the definitive study. Adequate evidence of DETDA toxicity was demonstrated via the oral route of administration to warrant the same route in the main study. The maximum tolerated dose of DETDA, 500 mg/kg

- bw, was selected for use in the main study, with 250 and 125 mg/kg

- bw as the lower dose levels.

Micronucleus Test: There were no premature deaths, but clinical signs including hunched posture, lethargy, and ptosis, were observed at ≥ 125 mg/kg

- bw in both the 24

- and 48

- hour groups. The presence of clinical signs indicated that systemic absorption had occurred. There

were no sta tistically significant decreases in the PCE /NCE ratio in the 24

- or 48

- hour DETDA groups compared to the concurrent vehicle control groups. There were no statistically significant increases in the frequency of micronucleated PCE in any of the DETDA dose g roups when compared to their concurrent vehicle control groups.

The positive control performed as expected.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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117 CONCLUSIONS

The test substance did not induce micronuclei in bone marrow polychromatic erythrocytes of mice treated by a single oral gavage dose (125, 250 or 500 mg/kg

- bw) of the test substance

.

STUDY RELIABILITY

[2] Reliable with restriction s

. The r eport was supplied as a summary and important details were missing including mean and standard deviations of micronucleated PCE for each dose group and PCE/NCE ratios by dose group

.

REFERENCE

Durward, R. and Nolan, S. 2000. LZ1224.20: Micronucleus Test in the Mouse, SPL Project Number: 102/340. Study No. 2080. Performing Laboratory: SafePharm Laboratories, Ltd. Shardlow, Derbyshire. Spon sor: Lonza Limited, Basle, Switzerland. (Cited as Durwood and
Nolan [2000] in summary submitted by Albemarle and Lonza on March 1, 2012)Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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118 Study 3 : Micronucleus study in mice (Naismith and Matthews, 1979)

Title: Micronucleus Test (MNT)

This study is : Adequate Not Adequate

Important details were missing from the study including purity and composition of the test substance and cytotoxicity. Additionally, this study is not reliable for the following reasons: (1) The study tested only two doses whereas CFR 799.9539 stipulates the testing of three doses that cover a range from the maximum to little or no toxicity; (2) The study used 4 animals/sex/dose whereas CFR 799.9539 stipulates the testing of at least 5 an alyzable animals/sex/group; (3) The study sacrificed animals at 6 hours after the second of two doses whereas CFR 799.9539 stipulates that sacrifice for bone marrow sampling between 18 and 24 hours following the final treatment; and (4) The study reported the number of micronuclei per 1000 polychromatic erythrocytes whereas CFR 799.9539 stipulates the scoring of at least 2000/animal.

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1 ; Synonym: Diethyltoluenediame (DET D A); Purity not specified

Remarks: Dark brown liquid; Sample No. 10121

METHOD

Method/guideline followed: Standard Operating Procedure PH

- 309

Test type: Mouse bone marrow micronucleus test

GLP compliant?: Yes

Year study performed: 1979

Test species: CF

- 1 mice (7

- 12 weeks old, 22

- 26 g males, 22

- 25 g females)

Number of animals/sex/dose: 4

Route of administration: Intraperitoneal injection

Vehicle: 0.25% Methylcellulose

Metabolic activation: N/A

Doses tested: 0 (vehicle control), 50 and 100 mg/kg

- bw

Statistical methods used: Student’s “t” testFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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119 Test method/conditions remarks: In a preliminary dose

- range study, DETDA was dosed i.p. once daily for two days to groups of ten mice at concentrations of 500, 250, 150, 100 and 50 mg/kg. Based on the results of the dose

- range

- finding study, the dose levels for DETDA in the Micronucleus Test were chosen at 100 mg/kg and 50 mg /kg.

In the Micronucleus Test, DETDA was administered via intraperitoneal injection once daily for 2 days to 4 female and 4 male mice at doses of 50 or 100 mg/kg

- bw. Triethylenemelamine served as a positive control (0.5 mg/kg

- bw), and the vehicle, 0.25% methylcellulose (20 mL/kg

- bw) as
the negative control. The positive and negative controls were administered to two groups of 8 mice. Mice were sacrificed 6 hours after the second dose, marrow was aspirated from the femurs and used to prepare microscopic slides for evaluation.

The slides are screened for good preparation, i.e. well spread, undamaged, perfectly stained. One thousand (1000) polychromatic erythrocytes are counted for the presence of micronuclei. The frequency of micronucleated cells is expressed as percent micronucleated cells versus total polychromatic erythrocytes. Roughly 8% of the cells are erythrocytes and half are polychromatic. The slides are examined using the oil immersion objective of an American Optical Microstar ® Binocular Microscope. Results are analyzed accordi ng to the Student’s “t”

test.

RESULTS

Preliminary Study: The 500 mg/kg dose group exhibited severe ataxia, passivity, salivation, loss of righting and twitches. Seven mice died within one hour of dosing. The remaining three mice exhibited identical symptomatology after the second dose, and a ll mice died within one hour post

- dose.

The 250 mg/kg dose group exhibited ataxia, complete body drop, ptosis, tonic behavior, brief loss of righting, decreased body tone and decreased spontaneous activity. All symptoms were very pronounced. A 2

– 6 g ram per mouse weight loss was noted after the second dose with one mouse dying one hour after the second dose.

The 150 mg/kg dose group exhibited slight ataxia, complete body drop, decreased body tone, passivity, ptosis, depression and decreased spontan eous activity. No deaths occurred.

The 100 mg/kg dose group exhibited body drop, loss of body tone, ptosis, depression, abnormal gait, and decreased spontaneous activity. No dea ths occurred.

The 50 mg/kg dose group exhibited decreased spontaneous acti vity slight loss of body tone and depression. No deaths occurred.

Micronucleus Test: DETDA was negative for the induction of micronuclei, based on the inability of the test article to produce a statistically significant increase in the number of micronuc lei per 1000 polychromatic erythrocytes in the treated versus the control groups.

Genotoxicity result: NegativeFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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120 Cytotoxic dose: Not indicated

Results remarks: The positive control performed as expected. As per the sponsor’s request,
slides from the Micronucleus Test on DETDA were rescored in 1984 according to present criteria. The slides were first counted in 1979, prior to changes in the criteria for scoring
micronuclei.

CONCLUSIONS

The test substance did not induce micronuclei in bone marrow erythrocytes of mice treated by two consecutive daily intraperitoneal injections at either dose (50 or 100 mg/kg

- bw).

STUDY RELIABILITY

[3] Not reliable. Important details were missing from the study including purity and composition of the test substance and cytotoxicity. Additionally, this study is not reliable for the following reasons: (1) The study tested only two doses whereas CFR 799.9539 stipulates the testi ng of three doses that cover a range from the maximum to little or no toxicity; (2) The study used 4 animals/sex/dose whereas CFR 799.9539 stipulates the testing of at least 5 analyzable animals/sex/group; (3) The study sacrificed animals at 6 hours after the second of two doses whereas CFR 799.9539 stipulates that sacrifice for bone marrow sampling between 18 and 24 hours following the final treatment; and (4) The study reported the number of micronuclei per 1000 polychromatic erythrocytes whereas CFR 799. 9539 stipulates the scoring of at least
2000/animal.

REFERENCE

Naismith, R. and Matthews, R. 1979. Micronucleus Test (MNT). Study No. PH

- 309

- ET

- 004

- 79. Performing Laboratory: Pharmakon Laboratories, Scranton, PA. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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121 C

- 8. Reproductive Toxicity : Test Requirement (F1) u nder Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Not adequate

No studies were submitted for this endpoint.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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122 C

- 9 . Developmental Toxicity : Test Requirement (F1) under Final HPV2 Test Rule Dated January 7, 2011

Summary of endpoint: Not adequate

No studies were submitted for this endpoint.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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123 D. SUPPLEMENTAL DATA (NON

- SIDS ENDPOINTS)

D

- 1. Genetic Toxicity

– Other

Study 1 : Dominant lethal assay in rats ( Schechtman et al., 1979)

Title: Activity of T1363 (otherwise known as diethyltoluenediamine) in the dominant lethal assay in rodents for mutagenicity

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1 ; Synonym: Diethyltoluenediamine (DETDA)

Remarks: T1363; brown liquid.

METHOD

Method/guideline followed: Not indicated

Test type: Rodent dominant lethal assay

GLP compliant?: Not indicated

Year study performed: 1979

Test species: Sprague Dawley rats, males (n=10/group); at start of test initiation, rats were 8

- 10
weeks old and weighed 225

- 260 g (males) or 185

- 215 g (females).

Route of administration: Oral

- gavage

Vehicle: Corn oil

Metabolic activation: Not applicable

Concentrations tested: 0, 0.7, 7 or 70 mg/kg

- bw

Statistical methods used: T

- test, Chi

- square, Analysis of Regression, Analysis of Linear Trend, Analysis of Variance, Probit Analysis, and Freeman

- Tukey test.

Test method/conditions remarks: The dominant lethal assay was performed by sequentially mating males, following chemic al administration, with groups of untreated females over the duration of the spermatogenic cycle. Weeks 1 and 2 of sequential mating of treated males with pairs of untreated females served to identify action of postmeiotic stages of spermatogenesis;
three and four on meiotic stages, and weeks five through eight on premeiotic stages. Positive (triethylene melamine) and negative controls (corn oil) were run concurrently. Dominant lethal mutations were measured directly by enumeration of fetal deaths and ind irectly by pre

-Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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124 implantation losses, as measured by reduction in the number of total implants in test groups as compared with control females.

In this study, three groups (n = 10/group) of male Sprague

- Dawley rats were administered 5
treatments of DETDA via gavage in corn oil at 0, 0.7, 7 or 70 mg/kg

- bw. 0.5 mg/kg

- bw of the positive control was administered via a single injection, and 4 mL/kg of the negative control was administered via gavage. The following week, each male was mated with 2 females from Monday through Friday. On the subsequent Monday, the male was mated with 2 new females and the process repeated until each male had been mated for 7 weeks with 2 new females/wk. Fourteen days from the mid

- week of mating, females were sacrificed and the re productive tract examined. Nine parameters were analyzed: fertility index, total implantations per pregnant female, corpora lutea per pregnant female, pre

- implantation losses per pregnant female, dead implants per pregnant female, proportion of pregnant fe males with one or more dead implants, proportion of pregnant females with two or more dead implants, dead implants per total implants, and live implants per pregnant female. Appropriate statistical methods were used to compare
control and treated animals.

RESULTS

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): Not applicable

Results remarks: The negative controls were within the normal range of values for this species and strain as observed in the test laboratory. The positive control exhibited its usual severe genetic damage between weeks 2 and 7 as shown by greater pre

- implantation losses, increased number of dead implants per female, decreased number of live implants per female, and more
females with one or more as w ell as two or more dead implants.

The test compound exhibited minimal activity in total implantations, pre

- implantation losses, number of dead implants per total implants and number of live implants per pregnant female. No statistically significant dose r esponse was observed.

CONCLUSIONS

It was concluded DETDA exhibited little or no mutagenic activity in the dominant lethal test.

STUDY RELIABILITY

[3] Not reliable. Test guideline and GLP compliance were not indicated and a rationale for dose selection was not presented. Additionally, evidence was not provided, as stipulated by the OPPTS 870.5450 guideline for the Rodent Dominant Lethal Assay, that the highest dose produced signs of toxicity (e.g. slightly reduced fertility or slightly reduced body weight).Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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125 REFERENCE

Schechtman, L., Putman, D., Pannar, A., and Sinsky, P. 1979. Activity of T1363 (otherwise known as diethyltoluenediamine) in the dominant lethal assay in rodents for mutagenicity. Performing Laboratory: Microbiological Associates, Bethesda, MD. Sponsor: Ethyl Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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126 Study 2 : DNA repair test in primary rat hepatocytes ( Johnson and Mulholland, 1984)

Title: Rat hepatocyte primary culture/DNA repair test

TEST SUBSTANCE

Identity: Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; referred to as diethyltoluenediamine (DETDA); purity not specified

Remarks: Slightly y ellow viscous liquid

METHOD

Method/guideline followed: Protocol

- ETTOX 028

Test type: Primary rat hepatocyte DNA repair test

GLP compliant?: Yes

Year study performed: 1984

- 1985

Test species: Primary rat hepatocytes from adult male Fischer

- 344 rats (150

- 300 grams)

Metabolic activation: None

Concentrations tested : 0 (DMSO solvent control), 0 (untreated control), 0.05, 0.1, 0.5, 1, 5, 10, 50, 100, 500 and 1000 μg/well in 2 mL of media.

Statistical methods used : Chi square analysis

Test method/conditions remarks: The test substance was dissolved in DMSO. DMSO was
used as a vehicle control and 2

- acetamidofluorene (2AAF) was the positive control.

Freshly isolated rat hepatocytes were treated with 20 μl of DETDA at 0.05, 0.1, 0.5, 1, 5, 10, 50, 100, 500 and 1000 μg/well in 2 mL of media. In addition, a DMSO group, an untreated control,
and 2

- acetoamido fluorine (2AAF) at a concentration of 10 - 6 M, were evaluated concurrently.

Isolat ion of Adult Rat Hepatocytes: The protocol for isolating adult rat hepatocytes is a modification of the method described by Williams (1978).

Perfusion Media: Medium A. 0.5 mM EGTA prepared as described in SOP # ETTOX 029. Medium B. Collagenase, 100 uni ts/mL prepared as described in SOP # ETTOX 029.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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127 Surgical and Perfusion Procedure: Male Fischer rats are anesthetized with Sodium Nembutal by intraperitoneal injection. Following anesthetization, the liver is perfused and removed following the procedure o utlined in SOP # ETTOX 029.

Cell harvesting: The liver is excised and the hepatocytes are harvested according to SOP
# ETTOX 029.

Dosage Selection: The highest dose will be 5% solution or the highest soluble concentration of
the test article in the appropriate solvent. The remaining nine doses will be half

- log dilutions
from the 5% solutions.

Test Protocol: Hepatocytes are treated with the test article, fixed onto microscope cover slides, stained, dipped, and developed according to SOP # ET TOX 029.

Data Quantification: Unscheduled DNA repair synthesis, evidenced by a net increase in black silver grains in the nucleus, is quantified by determining nuclear and background grain counts of 25 cells/slide or as many cells as possible (up to 25) in the presence of toxicity using an automatic colony counter with a microscopic attachment. The test compound is reported as positive or equivocal if there is a dose

- related increase of mean net nuclear grain counts, a mean net nuclear grain count of 5 o ver background is consistently observed, and/or there is a statistically significant dose related increase over background of cells with net nuclear counts greater than zero.

RESULTS

The highest dose scored was 1000 μg/well. Unscheduled DNA repair synth esis was quantified by a net nuclear increase of black silver grains for 25 cells/slide. This value was determined by taking a nuclear count and the average of three adjacent cytoplasmic counts.

DETDA did not cause an increase in mean net nuclear counts over DMSO at any dose levels counted (1000, 500 and 100 μg/well). A Chi square analysis was done to compare treated cells to untreated controls. The number of cells with net nuclear grain counts greater than zero of all
scored dose levels of DETDA was no t significantly increased statistically over DMSO.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): Slight cytotoxicity was observed at 1000 μg/well.

Results remarks: The vehicle (DMSO) and positive control net nuclear grain counts were acceptable. Color and appearance of the test article did not change from the time of receipt to
the time of use.

CONCLUSIONS

DETDA was not genetically active in the Rat Hepatocyte Primary Culture/DNA Repair Test according to Protocol

– ETTOX 028.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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128 STUDY RELIABILITY

[2] Reliable with restrictions. Purity of test substance was not provided. Additionally, the study author did not provide analytical data to verify actual concentrat ions used in the assay.
REFERENCES

Johnson, D. and Mulholland, A. 1984. Rat Hepatocyte Primary Culture/DNA Repair Test. Diethyltoluenediamine. DETDA. Study No. HPC 023

- #073. Performing Laboratory: Genetic Toxicology Laboratory. Sponsor: Ethyl Cor poration, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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129 Study 3 : DNA repair test in primary rat hepatocytes ( Johnson and Mulholland, 1986)

Title: Rat hepatocyte primary culture/DNA repair test

TEST SUBSTANCE

Identity: Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Referred to as
DETDA

- OBG

Remarks: Lot #5868

- 1; Amber liquid; Composition: 0.7% METDA; 78.2% 2,4

- DETDA; 20.3% 2,6

- DETDA; 0.8% other isomers, trialkylated toluenediamine a

METHOD

Method/guideline followed: Protocol

- ETTOX 028

Test type: Primary rat hepatocyte DNA repair test

GLP compliant?: Yes

Year study performed: 1986

Test species: Primary rat hepatocytes from adult male Fischer

- 344 rats (150

- 300 grams)

Metabolic activation: None

Concentrations tested : 0 (DMSO solvent control), 0 (untreated control), 0.05, 0.1, 0.5, 1, 5, 10, 50, 100, 500 and 1000 μg/well in 2 mL of media

Statistical methods used : Chi square analysis

Test method/conditions remarks: The test substance was dissolved in DMSO. DMSO was
used as a vehicle control and 2

- acetamidofluorene was the positive control.

Freshly isolated rat hepatocytes were treated with 20 μl of DETDA

- OBG at 0.05, 0.1, 0.5, 1, 5, 10, 50, 100, 500 and 1000 μg/we ll in 2 mL of media. In addition, a DMSO group, an untreated control, and 2

- Acetoamido fluorine (2AAF) at a concentration of 10 - 6 M, were evaluated concurrently.

Isolation of Adult Rat Hepatocytes: The protocol for isolating adult rat hepatocytes is a

m odification of the method described by Williams (1978).

Perfusion Media: Medium A. 0.5 mM EGTA prepared as described in SOP # ETTOX 029. Medium B. Collagenase, 100 units/mL prepared as described in SOP # ETTOX 029.

a Composition taken from Mulholland, 1986Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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130 Surgical and Perfusion Procedure: Ma le Fischer rats are anesthetized with Sodium Nembutal by intraperitoneal injection. Following anesthetization, the liver is perfused and removed following the procedure outlined in SOP # ETTOX 029.

Cell harvesting: The liver is excised and the hepatocytes are harvested according to SOP #
ETTOX 029.

Dosage Selection: The highest dose will be 5% solution or the highest soluble concentration of the test article in the appropriate solvent. The remaining nine doses will be half

- log dilutions
from t he 5% solutions.

Test Protocol: Hepatocytes are treated with the test article, fixed onto microscope coverslides, stained, dipped, and developed according to SOP # ETTOX 029.

Data Quantification: Unscheduled DNA repair synthesis, evidenced by a net incre ase in black silver grains in the nucleus, is quantified by determining nuclear and background grain counts of 25 cells/slide or as many cells as possible (up to 25) in the presence of toxicity using an automatic colony counter with a microscopic attachmen t. The test compound is reported as positive or equivocal if there is a dose

- related increase of mean net nuclear grain counts, a mean net nuclear grain count of 5 over background is consistently observed, and/or there is a statistically significant dose related increase over background of cells with net nuclear counts greater than zero.

RESULTS

The highest dose scored was 5 μg/well. Unscheduled DNA repair synthesis was quantified by a net nuclear increase of black silver grains for 25 cells/slide. This value was determined by taking a nuclear count and the average of three adjacent cytoplasmic counts.

The results for test article DETDA

- OBG were negative in the rat hepatocyte primary culture/DNA repair test under the conditions of this assay. These results are based upon the inability of DETDA

- OBG to produce a mean grain count of five or greater than the vehicle control mean grain count and no statistically significant difference between the DETDA

- OBG
treated cells and the vehicle control in the num ber of cells with net nuclear grain counts greater
than zero. No dose

- related increase in net nuclear counts or cells greater than zero was demonstrated by DETDA

- OBG. A Chi square analysis was done to compare treated cells to
untreated controls.

Genotox icity result: Negative

Cytotoxic concentration (if applicable): 10, 50, 100, 500 and 1000 μg/well

Results remarks: The vehicle and positive control net nuclear grain counts were acceptable. Color and appearance of the test article did not change from the time of receipt to the time of use.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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131 CONCLUSIONS

DETDA

- OBG was not genetically active in the rat hepatocyte primary culture/DNA repair test according to Protocol

– ETTOX 028.

STUDY RELIABILITY

[2] Reliable with restrictions. The study author did n ot provide analytical data to verify actual concentrations used in the assay.

REFERENCES

Johnson, D. and Mulholland, A. 1986. Genetic Toxicology. Rat Hepatocyte Primary Culture/DNA Repair Test. DETDA

- OBG. Study No. HPC 027

- #099. Performing Laboratory: Genetic Toxicology Laboratory. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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132 Study 4 : DNA repair test in primary rat hepatocytes ( Johnson and Mulholland, 1986)

Title: Rat hepatocyte primary culture/DNA repair test

TEST SUBSTANCE

Identity: 98.9% 3,5

- Diethyltoluene

- 2,6

- diamine, CAS No. 2095

- 01

- 4; Referred to as 2,6

- DETDA #2

Remarks: Lot #5712

- 71

- 6; Pale green crystalline solid; Composition: 98.9% 3,5

- diethyltoluene

- 2,6,diamine; 0.8% monoethyltoluenediamine; 0.3% other isomers. a

METHOD

Method/guideline followed: Protocol

- ETTOX 028

Test type: Primary rat hepatocyte DNA repair test

GLP compliant?: Yes

Year study performed: 1986

Test species: Primary rat hepatocytes from adult male Fischer

- 344 rats (150

- 300 grams)

Metabolic activation: None

Concentrations tested : 0 (DMSO solvent control), 0 (untreated control), 0.05, 0.1, 0.5, 1, 5, 10, 50, 100, 500 and 1000 μg/well in 2 L of medium

Statistical methods used : Not indicated

Test method/conditions remarks: The test substance was dissolved in DMSO. DMSO was
used as a vehicle control and 2

- acetamidofluorene was the positive control.

Freshly isolated rat hepatocytes were treated with 20 μl of 2,6

- DETDA #2 at 0.05, 0.1, 0.5, 1, 5, 10, 50, 100, 500 and 1000 μg /well in 2 mL of media. In addition, a DMSO group, an untreated control, and 2

- Acetoamido fluorine (2AAF) at a concentration of 10 - 6 M, were evaluated concurrently.

Isolation of Adult Rat Hepatocytes: The protocol for isolating adult rat hepatocytes is a modification of the method described by Williams (1978).

Perfusion Media: Medium A. 0.5 mM EGTA prepared as described in SOP # ETTOX 029.

a Composition taken from Mulholland, 1986Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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133 Medium B. Collagenase, 100 units/mL prepared as described in SOP # ETTOX 029.

Surgical and Perfusion Procedure: Male Fischer rats are anesthetized with Sodium Nembutal by intraperitoneal injection. Following anesthetization, the liver is perfused and removed following the procedure outlined in SOP # ETTOX 029.

Cell harvesting: The liver is excised and the hepatoc ytes are harvested according to SOP #
ETTOX 029.

Dosage Selection: The highest dose will be 5% solution or the highest soluble concentration of the test article in the appropriate solvent. The remaining nine doses will be half

- log dilutions
from the 5% s olutions.

Test Protocol: Hepatocytes are treated with the test article, fixed onto microscope coverslides, stained, dipped, and developed according to SOP # ETTOX 029.

Data Quantification: Unscheduled DNA repair synthesis, evidenced by a net increase in black silver grains in the nucleus, is quantified by determining nuclear and background grain counts of 25 cells/slide or as many cells as possible (up to 25) in the presence of toxicity using an automatic colony counter with a microscopic attachment. The test compound is reported as positive or equivocal if there is a dose

- related increase of mean net nuclear grain counts, a mean net nuclear grain count of 5 over background is consistently observed, and/or there is a statistically significant dose related increase over background of cells with net nuclear counts greater than zero.

RESULTS

The highest dose scored was 5 μg/well. Unscheduled DNA repair synthesis was quantified by a net nuclear increase of black silver grains for 25 cells/slide. This value was determined by taking a nuclear count and the average of three adjacent cytoplasmic counts.

The results for test article 2,6

- DETDA #2 were negative in the Rat Hepatocyte Primary Culture/DNA Repair Test under the conditions of this assay. These results are based upon the inability of 2,6

- DETDA #2 to produce a mean grain count of five or greater t han the vehicle control mean grain count and no statistically significant difference between the 2,6

- DETDA #2 treated cells and the vehicle control in the number of cells with net nuclear grain counts greater
than zero. No dose

- related increase in net nuc lear counts or cells greater than zero were demonstrated by 2,6

- DETDA #2.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): 10, 50, 100, 500 and 1000 μg/well

Results remarks: The vehicle and positive control net nuclear grain co unts were acceptable. Color and appearance of the test article did not change from the time of receipt to the time of use.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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134 CONCLUSIONS

2,6

- DETDA #2 was not genetically active in the Rat Hepatocyte Primary Culture/DNA Repair Test according to Protocol

- Ettox 028.

STUDY RELIABILITY

[2] Reliable with restrictions. Missing study details included statistical methods used and analytical data to verify actual concentrations used in the assay.

REFERENCES

Johnson, D. and Mulholland, A. 1986. Genetic Toxic ology. Rat Hepatocyte Primary Culture/DNA Repair Test. 2,6

- DETDA #2. Study No. HPC 027

- #100. Performing Laboratory: Genetic Toxicology Laboratory. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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135 Study 5 : DNA repair test in E. coli ( Schechtman et al., 1978)

Title: Activity of DET D A in a test for differential inhibition of repair deficient and repair competent strains of Escherichia coli : DNA repair

TEST SUBSTANCE

Identity: Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Synonym:
D iethyltoluenediamine (DET D A); Purity not specified

Remarks: Referred to as “DETA”, identified as “Diethyltoluenediamine”, d ark brown viscous liquid

METHOD

Method/guideline followed: Not indicated

Test type: E. coli DNA repair test

GLP compliant?: Not indicated

Year study performed: 1978

Test species: Escherichia coli W3110/polA + (ATCC No. 27325); E. coli P3478/polA - (ATCC No. 25947); Animals: Sprague

- Dawley adult male rats, 200

- 225 grams

Metabolic activation: With and without (tested separately with S

- 9 metabolic activation from rat livers)

Concentrations tested : 2, 10 and 20 μl/plate

Statistical methods used : One

- sided t

- test

Test method/conditions remarks:

Section A. Repair Test Without Metabolic Activation: Overnigh t broth cultures of E. coli (0.1 ml for the polA + strain and 0.3 ml for the polA - strain were added to 2 ml of molten medium HA (0.75% agar) supplemented with 5 μg thymine per ml in a 16 x 125 mm screw cap tube. The tubes are mixed on a Vortex

- Genie mixer and the contents poured over a base plate of medium HA. Plates are rotated to d istribute the overlay agar which is allowed to harden. After the overlay has set, a sterile filter paper disc is placed in the center of the plate and saturated with the test chemical. Plates are incubated overnight at 37°C
and the zones of inhibition ar e measured and compared for the polA + and polA - strains.

Liquid samples of the stock solution are tested at 20, 10 and 2 μl per plate.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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136 Plates are made for each control and each concentration of test agent. The following controls are
included:
1. Bacteria only
2. Solvent alone 3. Known positive compound: MMS: 10 μl per plate 4. Negative control: Chloramphenicol, 30 μg/plate

Section B. Repair Test With Metabolic Activation
1. Non

- specific induction of liver enzymes

- Aroclor 1254, a polychlorinated biphenyl, is used
for the non

- specific induction of liver enzymes in rats. Adult male Sprague

- Dawley rats, weighing 200

- 225 g, are given a single intraperitoneal injection of 500 mg/kg Aroclor 1254 in corn oil. On day 5 post injection, animals are sacri ficed by CO2 asphyxiation and the livers are
removed and the S

- 9 fraction prepared. Animals have free access to food until 12

- 15 hours before sacrifice; water is available at all times.

2. Preparation of S

- 9 fraction of the liver homogenate

– All operati ons are performed aseptically
at 0

- 4°C using sterile solutions and glassware. After surgical removal and weighing, livers are minced in 3 volumes 0.15 M KCl and homogenized in a Potter Elvejhem tissue grinder at 120

- 150 rpm. The homogenate is centrifuged at 9000 x g for 20 min. and the supernatant decanted and saved and designated the S

- 9 fraction. The S

- 9 is divided into 1 ml amounts and stored
frozen at

- 80°C until the day of use.

3. Preparation of S

- 9 mix

– On the day of the assay, sufficient S

- 9 for that day’s use is thawed and mixed with cofactors for use in the assay. S

- 9 mix contains per ml: S

- 9 (generally 40 μl to 100 μl), 8mM MgCl 2 , 33 mM KCl, 5 mM glucose

- 6

- phosphate, 4 mM NADP, and 100 mM sodium phosphate, pH 7.4. Reagents for the S

- 9 mix ar e weighed and prepared fresh daily with the exception of sodium phosphate which is made as a stock solution of 0.2 M. The entire S

- 9 mix is filter sterilized before use through a 0.45 u Nalgene disposable filter unit. S

- 9 mix is kept
at 0

- 4°C until use; unused portions are discarded at the end of the day.

4. Standardization of S

- 9 for use in the assay

– Each bulk preparation of S

- 9 is assays for aryl hydrocarbon hydroxylase (AHH) activity; protein is determined according to the method of Lowry et al

.

Pr ior to use in the assay, each S

- 9 preparation is titrated for bacterial mutagenesis in the
Salmonella /microsomal assay of Ames et al . Each preparation is tested at a wide range of concentrations (10 to 300 μl S

- 9 per ml of S

- 9 mix) with 3MC, BP, and 6

- AC to determine the optimum amount of S

- 9 for use in a general screening procedure. This is usually in the range of 50 to 100 μl of S

- 9 per ml of S

- 9 mix. We have found that the optimum amount of used in the
Salmonella /microsomal assay is also the best conc entration of S

- 9 for the repair test so a single
standardization is done for both.

5. The repair test with metabolic activation

– The assay is the same as that described in Section A, except 0.5 ml of S

- 9 mix is added to the overlay agar immediately befor e it is mixed and poured. Plates are incubated and zones of inhibition are measured as noted above.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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137 Controls for the assay with metabolic activation are bacteria and bacteria plus S

- 9 mix. Sterility controls on the test agent are done as noted above. O ne

- half ml of the S

- 9 mix, minus both test agent and bacteria, is added to 2 ml overlay agar and poured onto a minimal medium base plate and incubated for sterility also.

Chloramphenicol at 30 μg/plate serves as the negative control. Diethylnitrosamine (DEN) at 10 μl/plate serves as the positive control.

RESULTS

Before an agent is reported to be either active or inactive in the DNA Repair test with E

. coli , the following criteria must be met:

All sterility controls, including test compound and S

- 9, m ust be negative for bacterial growth. S

9 mix must not give a zone of inhibition. The bacterial control plates must show a complete lawn of growth. Known positive test agents must show a difference in zones of inhibition for strains polA + and polA - . Th ere must be no difference in the zone of inhibition with either strain for negative control compounds. Any test which does not meet these criteria must be repeated on a different day.

The tests reported upon below met each of the above mentioned criteria and the test agent was evaluated accordingly.

The difference in diameters of the zones of inhibition between the two strains (polA + and polA - ) is shown not to be statistically significant. The addition of an exogenous source of liver enzymes
to activate the test compound resulted in no statistically significant difference between the diameters of the zones of inhibition. For this test, liver homogenates from adult male rats which had been pretreated with Aroclor 1254 for the non

- specific induction of he patic enzymes served as the activation system. This preparation was used at a final concentration of 100 μl of S

- 9 per
ml of S

- 9 mix.

A one

- sided t

- test assuming unequal variants was performed on the data to determine statistical significance at either t he 0.05 or the 0.01 level.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): Not indicated

Results remarks: The integrity of the tester strains, polA + and polA - , is demonstrated by the preferential cell kill of a strain polA - which lacks excision repair, by MMS and by DEN, the positive control compounds for this test.

CONCLUSIONS

Under the conditions of this test, DET D A did not produce a statistically significant difference in its ability to produce cell death between repair deficient (polA - ) and repair competent (polA + )
strains of E. coli

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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138 STUDY RELIABILITY

[2] Reliable with restrictions. Several details are missing from the study including purity and composition of the test substance, method/guideline followed, GLP compl iance, cytotoxicity and analytical data to verify actual concentrations used in the assay.

REFERENCES

Schechtman, L., Parmar, A., and Fabrizio, D. 1978. Activity of DETA in a Test for Differential Inhibition of Repair Deficient and Repair Competent Strains of Escherichia coli : DNA Repair. Performing Laboratory: Microbiological Associates. Bethesda, MD. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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139 Study 6 : In vitro mammalian cell transformation assay ( Schechtman et al., 1978)

Title: Activity of DETA in i n vitro mammalian cell transformation assay

TEST SUBSTANCE

Identity: Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Synonym: Diethyltoluene di amine (DET D A); Purity not specified

Remarks: Referred to as “DETA”, identified as “Diethyltoluenediamine”, b rown liquid

METHOD

Method/guideline followed: Prot ocol of Schechtman and Kouri

Test type: In vitro mammalian cell transformation assay

GLP compliant?: Not indicated

Year study performed: 1978

Test species: BALB/3T3 Clone A31 mouse cells

Metabolic activation: Without

Concentrations tested : 1:10000, 1:15000, 1:20000 and 1:30000 (dilutions of test agent in reaction mixture)

Statistical methods used : None specified

Test method/conditions remarks: In vitro mammalian cell transformation tests with BALB/3T3 Clone A31 mouse cells are performed according to the methods of Schechtman and Kouri. Target cells are treated in suspension for 2 hours at 37°C with different concentrations of test chemical in the prese nce or absence of exogenously supplied subcellular hepatic metabolizing activity (S

- 9), washed by centrifugation, and plated for analysis of the cytotoxic effects of treatment and the induction of phenotypic transformation.

Positive and negative controls are included in every experiment. Benzo(a)pyrene (BP) or N

methyl

- N’

- nitro

- N

- nitrosoguanidine (MNNG) serve as positive control compounds in the presence or absence, respectively, of exogenous S

- 9. When appropriate, cell culture (growth) medium, acetone o r dimethylsulfoxide (DMSO), the solvent vehicle, +/

- S

- 9 serves as the negative control.

Exponentially growing BALB/3T3 C1. A31 cells were cultured in 75 cm 2 cell culture flasks and collected by trypsinization. Cells were seeded in triplicate dishes per condition at densities of 250 and 500 cells per 60 mm dish for determinations of the relative cytotoxic effects of eachFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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140 treatment and 1 x 10 4 cells per 60 mm dish in 12 replicate dishes per condition for determinations of the phenotypic transformation effects of each treatment. All cells were seeded in 4 ml complete growth medium.

Twenty

- four hours after the cells were seeded, twice concentrated working solut ions of the test chemical or the positive or negative controls were added 1:1 (v/v) to the medium in the dish; cells were then incubated for 24 hours at 37°C. After the exposure period all treatment media were withdrawn and the target cells were washed on ce with HBSS supplemented with 5% fetal bovine serum. Thereafter, the cells were replenished with 5 ml complete growth medium. The medium was changed twice each week for the duration of the assay.

Approximately 9

- 11 days after the initiation of the expe riment, the cytotoxicity assay plates were fixed with 100% methanol, stained with 10% aqueous Giemsa, and scored for the number of surviving colonies in order to determine the relative plating efficiencies. Approximately 30

- 40 days after initiation of the experiment, foci in the transformation assay plates were also fixed, stained, and scored for the morphologically transformed phenotype designated as Type III foci.

The cytotoxicity results are expressed in terms of plating efficiencies, i.e. the percent of the number of surviving colonies per dish relative to the number of cells seeded per dish, according to the protocol of Schechtman and Kouri (Appendix A). The transformation results are expressed in terms of transformation frequencies, i.e. the number of morphologically transformed (Type III) foci per number of cells at risk to the test agent, which is dependent upon the plating efficiencies of each test condition, according to the protocol of Schechtman and Kouri (Appendix B).

A preliminary cytotoxici ty test was conducted to determine the dose range to be employed in the transformation assay. Whenever possible, the approximately LD 50 concentration of the test chemicals plus 1 dose above and 1 dose below the LD 50 were those used in the transformation

a ssay. Cell culture (growth) medium, acetone, or DMSO (the solvent vehicle for the test agents) served as the negative control; 3

- MC or MNNG was used as the positive control.

APPENDIX A: Standard Protocol for the Determination of the Cytotoxic Effects of Test Chemicals to BALB/3T3 C1. A31 Mouse Cells in the Absence of Exogenous Metabolic Activation: Plate Assay

1. BALB 3T3 C1. A31 cells from sub

- confluent stock cultures are seeded at 2 different cell densities (250 and 500 cells per 60 mm dish) in triplic ate dishes per condition, in 4 ml growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum, and incubated at 37°C in a humidified atmosphere of 5% CO 2 + air.

2. Twenty

- four hours later, 2X concentrations of test chemical (6 d oses) or solvent vehicle (negative control) are added 1:1 (v/v) to the seeding medium; cells are incubated for 24 hours at
37°C. 3. Final concentrations of test chemical to be tested initially will cover a dose range from 30

- 0.1 μg/ml in approximate half

- l og dilutions. However, if desirable, the highest dose to be tested will be determined by the limits of solubility of the test agent.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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141 4. After a 24 hr exposure period, the treatment medium is withdrawn; cells are washed once with
Hanks’ balanced salt solu tions (pH 7.0) and resupplied with 5 ml fresh growth medium.

5. The medium in all plates is replaced every 3

- 4 days for the duration of the assay.

6. The plates are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and scored 7

- 10 days
after initiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded) and relative colony

- forming efficiency (RCE) (i.e. number of colonies in chemically

- treated dishes relative to the number of c olonies in solvent

- treated controls).

7. The approximate LD 50 is determined from the relative survival data. The LD 50 is that dose of test chemical which is lethal to 50% of the target cells.

APPENDIX B: Standard Protocol for the Morphological Transform ation of BALB/3T3 C1. A31 Mouse Cells in the Absence of Exogenous Metabolic Activation: Plate Assay

1. BALB 3T3 C1. A31 cells from sub

- confluent stock cultures are seeded at 3 different cell densities (250 and 500 cells per 60 mm dish, in triplicate dishes per condition, for cytotoxicity tests; 1 x 10 4 cells per 60 mm dish, 12 dishes per condition, for transformation tests) in 4 ml growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum, and
incubated at 37 C in a humidi fied atmosphere of 5% CO 2 + air.

2. Twenty

- four hours later, 2x concentrations of potential carcinogen (i.e. test chemical (3 doses), or positive control chemical) or solvent vehicle (negative control) are added 1:1 (v/v) to the seeding medium; cells are incubated for 24 hr at 37°C. The doses of test chemical used shall be based upon the results obtained in a preliminary cytotoxicity assay, and shall include the approximate LD 50 , one dose above and one dose below the LD 50 . (The LD 50 is that dose which
is lethal to 50% of the target cells.) If an agent is non

- toxic, then the highest dose that will be used will be a function of the limits of solubility of the test agent.

3. Treatment medium is withdrawn; cells are washed once with Hanks’ balanced salt sol ution (pH 7.0) and resupplied with 5 ml fresh growth medium.

4. The medium in all plates is replaced twice each week for the duration of the assay.

5. The cytotoxicity plates are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and
scored 7

- 10 days after initiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded).

6. Four to six weeks after initiation of the experiment, the transformation test plates are fixed,
stained and scored for morphologically transformed foci displaying the phenotypic properties designated Type III. The cells comprising such foci are characterized by their loss of contact

inhibition of cell growth and division, resulting in a randomly oriented piled

- up arra y of cells. Cellular constituents of such transformed foci grow into colonies in semi

- solid agar (whereasFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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142 non

- transformed cells do not) and are tumorigenic in vivo. Data is expressed in terms of a morphological transformation frequency (TF). The TF data can be expressed in one of two ways: (a) if RPE data is available, then TF is expressed per number of cells at risk to the test agent, and (b) if RPE data is unavailable, the TF is expressed as a function of the number of dishes showing morphological tran sformants.

7. Representative morphologically transformed foci are isolated, grown to large cell populations (2

- 3 weeks) and confirmed for in vitro phenotypic transformation by growth in semi

- solid agar.
The semi

- solid agar test takes 2

- 3 weeks.

RESULTS

In the preliminary study to determine the cytotoxic effects of compound DETDA on the BALB/3T3 C1. A31 cells, a dose response was not observed due to the extreme toxicity of
DETDA to the target cells. The test agent was 100% cytotoxic at all of the concentrations tested although a few single cells were observed at the 1:1000 dilution; however, no colony formation was observed. Compound DETDA precipitated heavily at all of the con centrations tested.

In the additional preliminary study utilizing revised dilutions to determine the cytotoxic effects
of DETDA on BALB/3T3 C1. A31 cells and to establish the approximate LD 50 of the test compound to the target cells, DETDA was observed to be 100% cytotoxic at the 1:1000, 1:2000 and 1:3000 dilutions. Although cell survival and colony formation was observed at the 1:5000 dilution, the relative survival of the target cells at this concentration was judged to be too low to
be used in the tran sformation assay.

In the cytotoxicity study of the compound DETDA which accompanied the transformation assay, a dose response was observed. Although DETDA was virtually 100% cytotoxic at the 1:10000 dilution (0.69% relative survival), the % relative surv ival at the 1:15000, 1:20000, and 1:30000 dilutions was found to be acceptable for the completion of the transformation assay (21.40%, 30.0% and 42.8%, respectively). The approximate LD 40 was found to be at the 1:30000 dilution of compound DETDA

.

In the cell transformation test in the absence of exogenous metabolic activation, DETDA was ineffective in producing Type III foci at all of the concentrations tested. The negative control condition (medium control) exhibited no spontaneously transformed foci wh ereas, the positive control condition (MNNG) produced 4 morphologically transformed foci (transformation frequency of 6.0 x 10 - 4 ).

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): ≥ 1:30000 (dilutions of test agent in reaction mixtu re)

Results remarks: None specifiedFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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143 CONCLUSIONS

Based on the results and discussion the following conclusions were made: (1) DETDA was found to be extremely cytotoxic to the BALB/3T3 C1. A31 cells. (2) DETDA precipitated in complete medium at all dilutions tested < 1:10000. (3) A dose response was observed only among dilutions tested ≥ 1:10000. (4) Under the conditions of the assay employed, test compound DETDA was incapable of inducing morphological transf ormants (type III foci) at any
of the concentrations tested.

STUDY RELIABILITY

[2] Reliable with restrictions. Important details were missing from the study including test substance composition and purity, GLP compliance and statistical methods used.

R EFERENCES

Schechtman, L., Beard, S., and Fabrizio, D. 1978. Activity of DETA in In Vitro Mammalian Cell Transformation Assay. Study No. T1365B. Performing Laboratory: Microbiological Associates., Bethesda, MD. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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144 Study 7 : In vitro mammalian cell transformation assay ( Schechtman et al., 1979)

Title: Activity of T1365A in in vitro mammalian cell transformation assay in the presence of exogenous metabolic activation

TEST SUBSTANCE

Identity: Diethyltolueneamine; Purity not specified

Remarks: Referred to as “DETA” and T1365A, identified as “Diethyltolueneamine”, b rown liquid

METHOD

Method/guideline followed: Protocol of Schechtman and Kouri

Test type: In vitro mammalian cell transformation assay

GLP compliant?: Not indicated

Year study performed: 1979

Test species: BALB/3T3 C1.A31 cells

Metabolic activation: With

Concentrations tested : 1:1 x 10 4 , 1:1.5 x 10 4 and 1:2 x 10 4 (dilutions of test agent in reaction mixture)

Statistical methods used : None specified

Test method/conditions remarks: In vitro mammalian cell transformation tests with BALB/3T3 Clone A31 mouse cells are performed according to the methods of Schechtman and Kouri. Target cells are treated in suspension for 2 hours at 37°C with different concentrations of test chemical in the presence or absence of exogenously supplied subcellular hepatic metabolizing activity (S

- 9), washed by centrifugation, and plated for analysis of the cytotoxic effects of treatment and the induction of phenotypic transformation.

Positive and negative controls are included in every experiment. Benzo(a)pyrene (BP) or N

methyl

- N’

- nitro

- N

- nitrosoguanidine (MNNG) serve as positive contr ol compounds in the presence or absence, respectively, of exogenous S

- 9. When appropriate, cell culture (growth) medium, acetone or dimethylsulfoxide (DMSO), the solvent vehicle, +/

- S

- 9 serves as the negative control.

Exponentially growing BALB/3T3 C1. A31 cells were cultured in 75 cm 2 cell culture flasks and collected by trypsinization into 50 cc conical tubes for treatment in suspension at 27°C for 2Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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145 hours in a buffer pool (reaction mixture) containing an NADPH

- generating system. The
treatment conditi ons were as follows:
a. Cells + S

- 9 mix + BP, 12.5 μg/ml (positive control)
b. Cells + S

- 9 mix +/

- solvent vehicle (negative control)
c. Cells + S

- 9 mix + test chemical (3 doses)

Prior to use, an S

- 9 preparation is pre

- treated for metabolic capacity in terms of aryl hydrocarbon hydroxylate (AHH) activity by a modification of published procedures.

After the exposure period, the target cells were washed and resuspended in complete growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal b ovine serum. Cells from each test condition were seeded at 250 cells per 60 mm dish in triplicate (cytotoxicity assay plates), and at 1 x 10 4 cells per 60 mm dish, 12 plates per condition (transformation assay plates) in 5 ml growth medium and incubated a t 37°C. The medium was changed twice each week for the duration of the assay.

Approximately 7

- 10 days after initiation of the experiment, cells in the cytotoxicity assay plates were fixed with 100% methanol, stained with 10% aqueous Giemsa, and scored for the number of surviving colonies in order to determine the relative plating efficiencies (RPE) according to the protocol of Schectman and Kouri (Appendix A).

Approximately 4

- 6 weeks after initiation of the experiment, cells in the transformation assay plates were fixed, stained and scored for the morphologically transformed phenotype designated as Type III foci, according to the protocol of Schechtman and Kouri (Appendix B).

The transformation results are expressed in terms of transformation frequenci es (TF) i.e., the number of morphologically transformed (Type III) foci per number of cells at rick (CAR) to the test agent, which is dependent upon the plating efficiencies of each test condition.

A preliminary cytotoxicity study was conducted to determi ne the dose range to be employed in the transformation assay. Whenever possible, the approximate LD 50 concentration of the test chemical plus one dose above and one dose below the LD 50 were those used in the transformation assay.

APPENDIX A: Standard Pro tocol for the Determination of the Cytotoxic Effects of Test Chemicals to BALB/3T3 C1. A31 Mouse Cells in the Presence of Exogenous Metabolic Activation: Suspension Assay

1. Two

- 3 x 10 6 logarithmically growing BALB/3T3 C1. A31 cells from sub

- confluent st ock cultures are collected into 50 cc capacity conical centrifuge tubes (two tubes per treatment condition) and centrifuged at 1000 RPM for 10 min at 4°C.

2. The supernatants are discarded and the cell pellets are resuspended in 4 ml reaction mixture

co nsisting of the S

- 9 mix (containing 100 μl S

- 9 (approximately 40 mg protein/ml) and cofactor pool) +/

- test chemical. The test conditions include:
a. Cells + S

- 9 mix + BP, 12.5 μ g/ml (positive control)Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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146 b. Cells + S

- 9 mix +/

- solvent vehicle (negative cont rol)
c. Cells + S

- 9 mix + test chemical Final concentrations of the test chemical employed are those used in the accompanying mutation/transformation assay.

3. The tubes containing each reaction mixture are incubated for 2 hr at 37 C in a humidified

atmos phere of 5% CO 2 + air. The reaction is terminated by centrifugation at 1000 RPM for 10
min at 4°C.

4. The cell supernatants are discarded; the cell pellets are resuspended for washing in Hanks’ balanced salt solution and then centrifuged at 1000 RPM for 10 min at 4 C.

5. The cell supernatants are discarded and the cell pellets are resuspended in growth medium (basal medium, Eagle) containing 10% heat

- inactivated fetal bovine serum. A cell count is then taken on the cells pooled for each test condition.

6. Cells are seeded at 250 cells per 60 mm dish in triplicate dishes per condition, in 5 ml growth
medium and incubated at 37°C.

7. The medium in all plates is replaced every 3

- 4 days for the duration of the assay.

8. The plates are fixed (methanol, 100%) stained (Giemsa, 10% aqueous) and scored 7

- 10 days after initiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded), and/or relative colony

- forming efficiency (RCE) (i.e.
number o f colonies in chemically treated dishes relative to the number of colonies in solvent

treated controls).

APPENDIX B: Standard Protocol for the Morphological Transformation of BALB/3T3 C1. A31 Mouse Cells in the Presence of Exogenous Metabolic Activation: Suspension Assay

1. Two

- 3 x 10 6 logarithmically growing BALB/3T3 C1. A31 cells from sub

- confluent stock cultures are collected into 50 cc capacity conical centrifuge tubes (two tubes per treatment condition) and centrifuged at 1000 RPM for 10 min at 4°C.

2. The supernatants are discarded and the cell pellets are resuspended in 4 ml reaction mixture consisting of the S

- 9 mix (containing 100 μ l S

- 9 (approximately 40 mg protein/ml) and cofactor pool) +/

- test chemical. The test conditions include:
a. Cells + S

- 9 mix + BP, 12.5 μg/ml (positive control)
b. Cells + S

- 9 mix +/

- solvent vehicle (negative control)
c. Cells + S

- 9 mix + test chemical (3 doses)

The doses of test chemical used shall be based upon the results obtained in a preliminary cytotoxicity ass ay, and shall include, whenever possible, the approximately LD 50 , one dose
above and one dose below the LD 50 . If an agent is non

- toxic, then the highest dose that will be used will be a function of the limits of solubility of the test agent.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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147 3. The tubes containing each reaction mixture are incubated for 2hr at 37°C in a humidified atmosphere of 5% CO 2 + air. The reaction is terminated by centrifugation at 100 RPM for 10
min at 4°C.

4. The cell pellets are resuspended for washing in Hanks’ balanced salt solution and then centrifuged at 100 RPM for 10 min at 4°C.

5. The cell supernatants are discarded and the cell pellets are resuspended in growth medium (basal, Eagle) containing 10% heat

- inactivated fetal bovine serum. A cell count is then taken on
the cells pooled for each test condition.

6. Cells are seeded at 2 different cell densities (250 cells per 60 mm dish, in triplicate dishes per condition, for cytotoxicity tests; 1 x 10 4 cells per 60 mm dish, 12 dishes per condition, for
transformation tests ) in 5 ml growth medium and incubated at 37°C.

7. The medium in all plates is replaced twice a week for the duration of the assay.

8. The cytotoxicity plates are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and
scored 7

- 10 days after initiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded).

9. Four to six weeks after initiation of the experiment, the transformation test plates are fixed, stained and scored for morphological ly transformed foci displaying the phenotypic properties designated Type III. The cells comprising such foci are characterized by their loss of contact inhibition of cell growth and division, resulting in a randomly oriented piled up array of cells.

10. Data is expressed in terms of morphological transformation frequency. The TF data can be expressed in one of two ways: (a) if (illegible) is vailable, then TF is expressed per number of cells at risk to the test agent, and (b) if RPE data is unavailable, then TF is expressed as a function of the number of dishes showing morphological transformants per condition.

APPENDIX C: Standard Protocol for the Determination of the Cytotoxic Effects of Test
Chemicals to BALB 3T3 C1. A31 Mouse Cells in the Absence of Exogenous Metabolic Activation: Plate Assay

1. BALB/3T3 C1. A31 cells from sub

- confluent stock cultures are seeded at 250 cells per 60 mm dish triplicate dishes per condition, in 4 ml growth medium (basal medium, Eagle) containing
10% heat

- inactivated fet al bovine serum, and incubated at 37°C in a humidified atmosphere of
5% CO 2 + air.

2. Twenty

- four hours later, 2X concentrations of test chemical (6 doses) or solvent vehicle (negative control) are added 1:1 (v/v) to the seeding medium; cells are incubate d for 24 hr at
37°C.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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148 3. Final concentrations of test chemical to be tested initially will cover a dose range from 30

- 0.1 μg/ml in approximate half

- log dilutions. However, if desirable, the highest dose to be tested will be determined by the limits of sol ubility of the test agent.

4. After a 24 hour exposure period, the treatment medium is withdrawn; cells are washed once with Hanks’ balanced salt solution (pH 7.0) and resupplied with 5 ml fresh growth medium

5. The medium in all plates is replaced every 3

- 4 days for the duration of the assay.

6. The plates are fixed (methanol, 100%), stained (Giemsa, 10% aqueous) and scored 7

- 19 days after initiation of the experiment for relative plating efficiency (RPE) (i.e. number of surviving colonies per number of cells seeded), and/or relative colony

- forming efficiency (RCE) (i.e. number of colonies in chemically

- treated dishes relative to the number of colonies in solvent

treated controls).

7. The approximate LD 50 is determined from the relative survival data. The LD 50 is that dose of the test chemical which is lethal to 50% of the target cells.

RESULTS

Under the conditions of the preliminary study (appendix C), compound T1365A was extremely cytotoxic to the target cells. The test agent was 100% cytotoxic to all of the concentrations tested although a few single cells were observed at the 1:1000 dilution; however, no colony formation was observed. Compound T1365A precipitated heavily at all of the concentrations
tested.

In an additional preliminary study uti lizing revised dilutions, T1365A was observed to be 100% cytotoxic at the 1:1 x 10 3 , 1:2 x 10 3 and 1:3 x 10 3 dilutions. Although cell survival and colony
formation was observed at the 1.5 x 10 3 dilution, the relative survival of the target cells at this

c oncentration was judged to be too low to be used in the transformation assay.

These results necessitated an additional cytotoxicity assay which would serve to estimate the approximate LD 50 of the test compound in the presence of exogenous metabolic activation. A 2 hour suspension assay in the presence of S

- 9 activation was conducted to meet this necessity. Although quantitative results (i.e. colony formation, REP) were not established, a qualitative estimation of the relative toxicity of test agent to the garget cells expressed in terms of (%) relative survival after treatment could not be established. Under these conditions, compound T1365A was again observed to be extremely cytotoxic, e ven at a 1:1 x 10 4 dilution (Relative
Survival ≤10%). A dramatic decrease in the level of toxicity was observed at dilutions ≥1:1.5 x
10 4 . The observed cellular response made it difficult to establish an LD 50 for test agent T1365A. Therefore, the transf ormation assay (and its accompanying cytotoxicity assay) was performed using these same doses in order to bracket the LD 50 range.

A quantitative cytotoxicity study accompanied the transformation assay. Under the conditions of this assay, an approximate L D 50 was observed at the 1:1 x 10 4 dilution of test compound T1365A in the presence of exogenously supplied S

- 9. Little or no toxic effects were observed at the other doses of T1365A employed.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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149 In the transformation test in the presence of metabolic activat ion, the compound was ineffective in producing Type III foci at all of the doses tested. Treatment with BP (the positive control chemical) in the presence of exogenous S

- 9 induced 3 morphologically transformed (Type III) foci (transformation frequency of 1.6 x 10 - 4 ), whereas the negative control condition (S

- 9 + buffer) failed to induce spontaneous transformants.

The transformation frequencies at 1:1 x 10 4 , 1:1.5 x 10 4 , and 1:2 x 10 4 were <0.55 x 10 4 , <0.26 x
10 4 and <0.23 x 10 4 , respectively.

Genotoxicity result: Negative

Cytotoxic concentration (if applicable): ≥ 1:2 x 10 4 (dilutions of test agent in reaction mixture)

Results remarks: None specified

CONCLUSIONS

Based on the results and discussion the following conclusions were made. (1) T1365A was found to induce a cytotoxic response among BALB/3T3 C1. A31 cells both in the presence and absence of metabolic activation. (2) Over precipitation of T1365A during the treatment period was noted. Due to the limited solubility of test compound T1365A in vehicles compatible with mammalian cell culture systems, it was difficult to establish the exact concentration of that chemical in solution. (3) Under the conditions of the assay employed, the test chemical was ineffective in inducing morphologi cal transformation (Type III foci) in the BALB/3T3 Clone 31 cell system at all concentrations employed.

STUDY RELIABILITY

[ 3 ] Not reliable . Important details were missing from the study including test substance purity and composition, GLP compliance and statistical methods used. The test substance is identified as diethyltolueneamine, which differs from diethyltoluenediamine (the subject of required testing); diethyltolueneamine is not an acceptable analog for diethyltoluenediamine.

REFERENCES

Schecht man, L., Beard, S., and Sinsky, P. 1979. Activity of T1365A in In Vitro Mammalian Cell Transformation Assay in the Presence of Exogenous Metabolic Activation. Study No. T1365A. Performing Laboratory: Microbiological Associates, Bethesda, MD. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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150 D

- 2. Carcinogenicity

Study 1: Two

- year oncogenicity study in rats ( Margitich and Ciofal o, 1992)

Title: Oncogenicity study

– rat 24 month study

TEST SUBSTANCE

Identity: Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Referred to as Diethyl Toluene Diamine (DETDA)

Remarks: Lot #6581

- 14; Clear yellow liquid; Analyzed composition of test substance throughout the study: 75.6

- 76.2% 2,4

- Isomer; 20.0

- 20.2% 2,6

- Isomer; 2.7

- 3.1% METDA (dialkylatedphenylenediamines); 0.2

- 0.3% TEMPDA (trialkylatedphenylenediamines); 126

- 181 ppm 2,4

- TDA (toluenediamine); 35

- 40 ppm 2,6

- TDA (toluenediamine)

METHOD

Method/guideline followed: Protocol 474

Test type: Two

- year oral oncogenicity study

GLP compliant?: Yes

Year study performed: 1988

- 1990

Test species: Sprague Dawley rats (Animals were 47 days old and had mean weights for males and females of 183.3 and 291.1 grams, respectively, at study initiation.)

Number of animals/sex/dose: 50

Route of administration: Oral (diet)

Vehicle: Certified commercial laboratory rat diet

Exposure duration: Daily, 7 days a week for 24 months (731 days)

Doses/concentrations tested: 0 (untreated control), 10, 35, 70 ppm

Statistica l methods used: Raw data were collected and/or summarized and statistically evaluated using LABCAT modules designed by Innovative Programming Associates, Pnc., 303 Wall Street, Princeton, NJ 08540. Evaluation of equality of means (body weight, food

consu mption, hematology and blood glucose) was made by the one way analysis of variance using the F distribution to assess significance. If significant differences among the means were indicated, Dunnett’s test was used to determine significant differences from control means. Statistical analyses (time

- to

- tumor) were evaluated using Systat (Version 4.1) by Systat Inc.,Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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151 Evanston, IL. Estimates of the probabilities of survival for rats fed diets containing DETDA were calculated using

- Kaplan and Meier statistics evaluated by SAS (Version 6.03), SAS Institute Inc., Gary, North Carolina. Statistical analysis of histopathological results were performed using the Fisher Exact Test and Cochran/Armitage Linear Trend Test.

Test method/conditions remarks: The commercial Diethyl Toluene Diamine (DETDA) product, Lot #6581

- 14, was incorporated into certified commercial laboratory rat diet and fed ad
libitum to four groups of Sprague Dawley rats (50 animals/sex/group) seven days per week for 731 days at dose le vels of 0 (control), 10 (low), 35 (mid) or 70 (high) ppm. At the end of the feeding period, all surviving animals were sacrificed. During the study, animals were observed daily and weighed weekly. Food consumption was measured twice weekly when the diet was replenished. Blood was collected at approximately 6

- month intervals for hematology exams (differential counts). Indirect ophthalmoscopy was performed on all rats prior to study initiation and at approximately 6, 12, 18 and 24 months. A complete nec ropsy was performed on all rats. Approximately 40 tissues were examined histologically from all rats in the control and high dose groups and all rats that died or were sacrificed during the study. The adrenal glands, eyes, liver, pancreas, pituitary and thyroid glands were evaluated in the mid and low dose groups. The mammary glands and any tissue mass suspected of being a mammary gland tumor were
evaluated in the low and mid dose females.

RESULTS

Endpoint value(s): LOAEL (hepatotoxicity) = 10 ppm (b ased on hepatic proliferative lesions and increased incidence and severity of degeneration changes in the liver of males); NOAEL (systemic toxicity) = Not established; LOAEL (pancreatic toxicity, males) = 70 ppm (based on pancreatic acinar atrophy accompan ied by interstitial fibrosis and fatty infiltration); LOAEL (pancreatic toxicity, females) > 70 ppm (based on no adverse effects at the highest dose tested); NOAEL (pancreatic toxicity, males) = 35 ppm; NOAEL (pancreatic toxicity, females) = 70 ppm;
LOAEL (thyroid effects) = 70 ppm (based on thyroid hyperplasia and hypertrophy); NOAEL (thyroid effects) = 35 ppm; LOAEL (liver and thyroid tumors) = 70 ppm (based on increased hepatocellular carcinomas and follicular cell adenomas in males, and increased hepato cellular adenomas in females); NOAEL (liver and thyroid tumors) = 35 ppm; NOAEL (mammary tumors) ≥ 10 ppm (based on questionable significance of mammary tumors in the mid and high dose females)

Results remarks: The majority of clinical signs observed were related to aging. These signs were not considered related to the administration of DETDA as they were distributed across the four groups in a non

- dose

- related manner. Ocular opacity was noted in a few high dose males. This change is considered the only clinical sign, which may have been related to the
administration of the test article.

Mean body weight of the male high dose group was statistically decreased from the control male body weight beginning on week 43 and continuing throughout the majori ty of the study. Control and mid dose mean body weights were statistically comparable throughout the study except on one occasion. However, a tendency for lower mean body weight in the mid dose males was seen beginning at about month 15 and continuing to the conclusion of the study. NoFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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152 effect, statistical or otherwise, was found on the body weight of low dose males compared to
control males.

The high dose female mean body weight was statistically comparable to the control female body weight except durin g four weeks of the study (weeks 80

- 83). During these 4 weeks, mean body weight of the high dose females was statistically lower than the female control mean. A tendency for a lower body weight in the high dose females compared to the control mean was seen in the last 3 months of the study. No statistical differences between the control and mid

dose female body weight were found. A tendency for a lower body weight in the mid dose was seen during the last four weeks of the study. The low dose female body weight was not affected.

Group mean food consumption was not affected by the administration of DETDA. Only sporadic, non

- dose

- dependent statistical differences in food consumption were detected between
control and treated animals of either sex. How ever, a few male high dose DETDA rats consistently exhibited a marked increase in daily food consumption.

No ocular lesions related to the administration of DETDA were detected on indirect ophthalmoscopy with the exception of bilateral cataracts in severa l high dose male rats. A correlation between animals affected with ocular cataracts and blood glucose levels greater than 300 mg/dL was observed at the 18

- month blood collection. No treatment related effect on white
blood cell differential count or red c ell morphology was found at any time point.

Survival was comparable between treated and control animals of each sex except in the low dose male rats. Survival in this group was significantly greater than the control males. Percent
survival was maintaine d above 50% until week 97, 104, 96 and 92 for males in the control, low,
mid

- and high dose groups, respectively. In females, 50% survival was maintained up to week 103, 102, 101 and 98 for the control, low, mid and high dose groups, respectively. Early deaths or moribund sacrifices occurred during the study. Lesions considered as the cause of death or moribund sacrifice included pituitary tumors, other large and/or malignant neoplasms, severe chronic renal disease and severe lesions of the hock/foot (su ppurative and ulcerative dermatitis). Rats in this study reached high body weights early in the course of the study. This factor may have contributed to the development of certain of the changes leading to the early deaths or
moribund sacrifices.

The ma jority of gross macroscopic observations at terminal necropsy were associated with aging and not considered manifestations of toxicity due to treatment. Certain gross changes in the liver may have been related to the test article.

Histopathology results showed a statistically increased incidence in comparison to the control animals of hepatocellular carcinomas and proliferative lesions in the liver of the high dose males, hepatocellular adenomas and proliferative lesions in the liver of the high dose fema les, thyroid follicular cell adenomas and follicular cell hypertrophy in high dose males and fibroadenomas of the mammary glands of mid and high dose females. Hepatic proliferative lesions (basophilic foci and eosinophilic foci) were significantly increas ed in all three male dose groups. All three male dose groups had an increased incidence and severity of degeneration changes in the liver (focal and multifocal cystic degeneration and multifocal necrosis). Basophilic foci in the liver ofFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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153 high dose female s were increased relative to controls. Eosinophilic foci in the liver of low dose,
but not mid

- or high dose, females were increased compared to control females. Pancreatic acinar atrophy accompanied by interstitial fibrosis and fatty infiltration (fatty atrophy) was present in the high dose male rats. Bilateral cataracts were detected in six high dose male rats. The presence of moderate to severe keratitis in half these animals complicates the interpretation of the significance of the cataracts. Howev er, based on the early detection of cataracts by indirect ophthalmoscopy coupled with elevated blood glucose levels, it appears likely these changes were related to administration of test article. Renal cysts and focal areas of tubular hyperplasia were in creased in high dose males compared to the control male rats. The relevance of treatment to this effect is equivocal, since some degree of age associated chronic nephropathy was present in nearly all of the kidneys examined and cysts and tubular hyperplas ia are components of chronic nephropathy. No treatment

- related neoplastic or nonneoplastic changes were noted in any of the other tissues examined. A variety of spontaneous neoplasms and incidental lesions were present in both the control and DETDA treat ed rats.

With respect to tumorigenicity, hepatocellular carcinomas were increased in the male high dose group. The incidence of a benign tumor of the thyroid, follicular cell adenoma, was also increased in high dose males. Hepatocellular adenoma, a beni gn tumor of the liver, was increased in high dose female rats. Mammary gland fibroadenoma, a benign tumor, were
increased in mid

- and high dose females. The effect on mammary gland tumors is the only instance where the female rats appeared affected at a lower level than the male. Since the incidence of malignant mammary gland tumors (adenocarcinomas) was high in the control females, the relevance of the increase in fibroadenomas is unknown. A no effect level for liver and thyroid tumors was 35 ppm. The questionable significance of the mammary tumors in the mid and high dose females complicates determination of a no effect level in this organ. At a minimum, the no effect level in this organ is 10 ppm and may be higher.

The results of this study should be evaluated in conjunction with the earlier DETDA studies conducted in the same laboratory. The 90

- day subchronic and 28

- day progression/reversibility studies identified the pancreas as the target organ in the rat. Male rats were more severely
affected and at an earlier time and lower dose than females. Histologically, pancreatic acinar cells were affected first; islet cell involvement followed afterward in a time and dose dependent manner. Pathology in other organs occurred after or in conjunction wit h islet cell involvement and appeared secondary to the metabolic changes induced by the pancreatic toxicity. Secondary effects included ocular cataracts in animals with histologic evidence of islet cell toxicity. It was postulated these cataracts were ass ociated with and related to hyperglycemia and thus the pancreatic toxicity. Histologic evidence of liver or thyroid toxicity was not seen.

The greater DETDA sensitivity of male, compared to female, rats was also observed in the two

year study. This response holds true for both toxicity and tumorigenicity. However, effects on the liver and thyroid, not seen in the subchronic studies, were detected in the two

- year study. Based on the absence of these effects in shorter term studies, liver and thyroid effects appear related to chronic, long term exposure.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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154 CONCLUSIONS

In the two

- year study, histologic evidence of pancreatic toxicity was restricted to the pancreatic acinar cells of high dose male rats. A functional aberration was suggested in individu al rats by the hyperglycemia, increased food consumption and ocular cataracts observed in a few high dose male rats. No histologic or suggestive evidence of pancreatic toxicity was seen in the mid and low male dose groups or in females at any dose level. Given these results, the no effect level for pancreatic toxicity in the male rat for two years was 35 ppm; for females the no effect level was 70ppm.

Unlike pancreatic toxicity, hepatic proliferative and degenerative changes were found in all male dose g roups. Only proliferative lesions were found in the females. A clear no effect level was not achieved. However, hepatotoxicity would appear related to long term chronic exposure as this effect was not observed in studies less than two years in length, e .g., the no effect level for hepatotoxicity was 320 ppm (highest dietary concentration tested) DETDA in a 90

- day dietary subchronic study in Sprague

- Dawley rats of [see review of this study (Naismith and Matthews 1987) in a separate robust summary within this document].

Evidence for thyroid hyperplasia or hypertrophy was found in high dose males and females. Lower dose levels were not affected. Like hepatotoxicity, thyroid effects were not seen in subchronic studies and are an effect of chronic long

- term exposure. A no effect level for both males and females in this study is 35 ppm.

Evidence of tumorigenicity was observed in the livers and thyroids of males dosed at 70 ppm and in the livers of females dosed at 70 ppm. Evidence of mammary tumors in fema les dosed at 35 or 70 ppm is of questionable significance; therefore, at a minimum, the no effect level in this organ is 10 ppm and may be higher.

STUDY RELIABILITY

[1] Reliable without restrictions.

REFERENCE

Margitich, D. and Ciofalo, V. 1992. On cogenicity Study

- Rat. 24 Month study. Study No. PH
474

- ET

- 001

- 88. Diethyl Toluene Diamine (DETDA). Lot# 6581

- 14. Performing Laboratory: Pharmakon Research International Inc. Waverly, PA. Sponsor: Ethyl Corporation, Baton Rouge,
LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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155 Study 2: Lifetime oral carcinogenicity ( Steinhoff , 1984 )

Title: Diethyltolamine carcinogenicity study with oral administration to rats

TEST SUBSTANCE

Identity: Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine ( DETDA )

Remarks: Referred to as “diethyltolamine”, but identified as diethyltoluenediamine. Batch 74 of the test substance was used for the preliminary experiments and for the first 11.5 months of the feeding study and Batch 94 was used for the remainder of the treatment in the feeding study and for the entire gavage study. Analysis of Batch 74 revealed a 2,4

- DETDA content of 66.8% and a 2,6

- DETDA content of 28.9%; Viscous brown liquid

METHOD

Method/guideline followed: Not indicated

Test type: Lifet ime oral carcinogenicity study

GLP compliant?: Not indicated

Year study performed: 1978

- 1982

Test species: Wistar

- W74 rats; Animals were 6 weeks old at test initiation

Number of animals/sex/dose: Gavage study

- 20; Diet study

– 50, plus 5/sex/group for interim sacrifices after 1 and 2 years

Route of administration: Oral (gavage or diet)

Vehicle: Gavage study

– Arachis oil; Diet study

- Feed

Exposure duration: Gavage study

– 2 years; Diet study

- Lifetime

Doses/concentrations tested: Gavage study

– 0 (untreated control), 0 (vehicle control), 4 or 12 mg/kg

- bw/day; Diet study

– 0 (control), 80 or 240 ppm

Statistical methods used:

DETDA in the feed:
“Dead” and “moribund sacrificed” are treated as equivalent for the calculation of survival rates, i.e. “moribund sacrificed” is not regarded as censorable data. The rat e s are calculated according
to KAPLAN

- MEIER are therefore relative frequencies. The outcome of the three dose groups per gender ar e compared to each other by means of generalized SAVAGE test.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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156 The number of animals with the histopathological tumor diagnoses are ordered according to topographical details and then portrayed separately according to gender. The animals are also arranged according to the number of locations with a positive tumor finding and according to the dignity of the findings.

Data is assembled for tumors that appear in a minimum of four animals of one gender within at least one treatment group as well as for benign , malignant and (positively identified) tumors.
The cumulative number s of animals with a particular tumor are tabulated at weekly intervals.

The possibility of a relationship between the tumor findings and the dosage is tested on the basis
of recommendat ions by PETO et al . The data as such still do not permit a causal relationship between a diagnosed tumor and the death of an animal to be distinguished from a coincidental one, however.

This information would be required for the calculation of the “death by tumor” rates (death rate method) or the tumor prevalence rates. In place of this, the hypothesis is tested

– formally in the sense of the “prevalence method”

– that the probability of positive tumor findings in animals
which die or are sacrificed in a moribund state within the same time span is the same for all 3 dose groups for each gender. This is set against the one

- sided alternative that this probability increases with increasing dosage of diethyltolamine. Weighting factors applied to the testing of these hypotheses are 0, 1 and 2 (increasing with dose).

Such tests are not carried out because the relevant paired comparisons (e.g. against controls) are not available for a given multiple niveau and it is not the objective of the study to determine the
dose above which a clear

- cut carcinogenic effect is seen. The results of both trend tests (one per gender and in each case not significant) also fail to provide a basis for going beyond a purely descriptive analysis of the individual tumor diagnoses.

The evaluation of the data is carried out by means of an ad hoc programme (cumulative number of animals with tumors seen against a time scale), the routine methods of the programme packages SAS (enumerating the tumor diagnoses) and BMDP (survival rates) a nd a programmed developed previously in the Department of Biometrics, EP

- FE (Prevalence rates by Dr. Dycka).

Administration of DETDA by gavage: “Dead” and “moribund sacrified” are treated as equivalent for the calculation of survival rates,
i.e. “moribund sacrified” is not regarded as censorable data. The rat e s are calculated according
to KAPLAN

- MEIER are therefore relative frequencies. The outcome of the three dose groups per gender are compared to each other by means of generalized SAVAGE test.

The nu mber of animals with the histopathological tumor diagnoses are ordered according to topographical details and then portrayed separately according to gender. The animals are also arranged according to the number of locations with a positive tumor finding a nd according to the dignity of the findings.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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157 Data is assembled for tumors that appear in a minimum of four animals of one gender within at least one treatment group as well as for benign, malignant and (positively identified) tumors.
The cumulative numbe r s of animals with a particular tumor are tabulated at weekly intervals.

The possibility of a relationship between the tumor findings and the dosage is tested on the basis of recommendations by PETO et al . The data as such still do not permit a causal re lationship between a diagnosed tumor and the death of an animal to be distinguished from a coincidental one, however.

This information would be required for the calculation of the “death by tumor” rates (death rate method) or the tumor prevalence rates. Moreover, there are no known methods that are relevant to the particular problems associated with this type of study and which are able to present linear contrasts in the manner of analysis of variance. It is, however, necessary to consider whether

untrea ted and oil

- treated controls can be combined for the assessment and compared to the two groups receiving substance. This in turn determines whether tests for inhomogeneity or trend
should be made.

The test is therefore carried out in two stages: firstly, the hypothesis is tested

– formally in the sense of the “prevalence method”

– that the probability of positive tumor findings in animals, which die or are sacrificed in a moribund state within the same time span, is the same in both control groups or, as the alternative hypothesis, that it is different. On the basis of the results of this test, the two control groups are combined and used to test the hypothesis described above
and the one

- sided alternative hypothesis, and the probability of tumor occurren ces increases with dose. Weighting factors applied to the testing of these hypotheses are 0, 1 and 2 (increasing with dose).

The generalized evaluation by the prevalence method leads to only 2 time interval classes in the
female animals when the time co urse is taken into consideration. Since only one animal dies in the first time interval the analysis is ended at this point.

The evaluation of the data is carried out by means of the routine methods of the programme packages SAS (description of the tumor findings) and BMDP (survival rates) and a programme developed previously in the Department of Biometrics, EP

- FE (Prevalence rates by Dr. Dycka).

Test method/conditions remarks: Preliminary acute and 90

- day studies were conducted. The acute toxicity of D ETDA was determined using Batch 74 (determination of the LD 50 ). The substance was mixed with arachis oil and administered by gavage on a single occasion to groups of 10 female Sprague

- Dawley rats aged about 8 months (breeder: Mus

- Rattus AG). The administration volume was 5 ml/kg. The observation period lasted three weeks. All the animals were autopsied. The LD50 was calculated by means of probit analysis.

The 90

- day study was based on four groups of 10 Wistar rats (5/sex) aged about 8 months. In this preliminary study the DETDA (Batch 74) was mixed in with the powdered feed. In concentrations of 0, 100, 300 and 900 mg/kg feed (ppm). The effect of the DETDA was assessed on the basis of the rats’ appearance and behavior, their body weights and their feed consumption and on the results of the autopsies performed at the end of the study.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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158 Carcinogenicity study: In one experimental group, the DETDA was mixed in with the powdered feed in initial concentrations of 0, 80 and 240 ppm; in a second group the DETDA was administered by gavage in initial doses of 0, 4, and 12 mg/kg body weight five times a week. In the feeding study 50 male and 50 female rats were used for each group (with additional 5 rats/sex/group for interim sacrifices after 1 and 2 yea rs), while in the group with administration by gavage each group comprised 20 male and 20 female rats. The experiments were performed as lifetime studies, i.e. all the rats died a natural death or were sacrificed in a clearly moribund
state. In the feedi ng treatment the DETDA was given until the end of the study; in the gavage administration the substance was given for 2 years (5 days/week) and the rats then continued to be observed until they died naturally.

The high dose in both dietary and gavage admi nistration was clearly toxic, especially in male rats. Consequently, the low and high dietary doses were halved from study 456 onward. The gavage doses were also reduced by 50% from day 127 until day 256 when the doses were halved again. The final doses administered via gavage were 1 or 3 mg/kg 5 days per week.

RESULTS

Endpoint value(s): No evidence of carcinogenicity.

Results remarks: After a single oral administration in arachis oil to female Sprague

- Dawley rats DETDA produced non

- specific symptoms of intoxication, manifested by general inertia with the animals assuming the prone position and lacrimating. No pathological findings were obtained at the autopsies other than bloodiness of the lungs. The LD 50 (confidence interval p ≤ 0.05) was 598 (568

- 653) mg/kg body weight.

As in the acute toxicity study, the intoxication symptoms in the 90

- day study proved to be uncharacteristic. A striking feature was the poor general condition of the rats receiving the highest concentration of DETDA (900 ppm in the feed). This applied to the male rats in particular. At the lower concentrations (300 and 100 ppm in the feed) no appreciable differences from the controls were found in either appearance or behavior. At the highest concentration (900 ppm) the animals suffered a distinct loss of weight, a phenomenon that again applied most particularly to the males. At the lower concentrations (300 and 100 ppm) no appreciable differences from the control animals were found in this respect. During the 13

- week study only one male rat receiving the highest concentration (900 ppm) died, this incident occurring in the
12 th week, without abnormal findings.

The food consumption calculated per kg body weight differed clearly from that of the control groups only in th e group on the highest concentration of DETDA in the feed (900 ppm), an increase being found towards the end of the study both in the males and in the females compared with the controls and the animals receiving the lower concentrations.

The autopsies o f the animals in the highest concentration group (900 ppm) performed at the end of the study did not yield any particular findings.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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159 Results for carcinogenicity study: Although clearly toxic, the nature of toxicity was not determined either by clinical obs ervation or on histopathology. Rats treated with the test article via the diet or gavage demonstrated reduced body weights, poor general condition, increased food and water consumption, and shorter survival times. Males at the upper doses were more

sever ely affected than females.

No evidence of carcinogenicity was found. When results by the two methods of administration were considered together, a dose

- dependent increase in the number of uterine tumors were counterbalanced by a more marked reduction i n testicular tumors. Tumors of mammary gland
were not dose

- dependently increased. Tumors in the adrenal gland were reduced at the high dose. Two malignant kidney tumors were found in the low dose group, two in the high dose group and two in the controls . Three benign kidney tumors were found at the high dose.

CONCLUSIONS

The report concluded that no evidence of carcinogenicity was found despite the fact that the test
animals were treated with the maximum tolerated to toxic doses.

STUDY RELIABILITY

[2] Reliable with restrictions. Test method/guideline and GLP compliance was not specified

REFERENCE

Steinhoff, D. 1984. Draft Report. Diethyltolamine Carcinogenicity Study with Oral Administration to Rats. Research Report. Performing Laboratory: Bayer AG Institute of Toxicology. Sponsor: Bayer AG, Germany.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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160 Study 3: Lifetime subcutaneous carcinogenicity ( Steinhoff, 1972)

Title: Carcinogenicity Study with the Isomer Compound Diethyltolamine Technical Experimental Product DD 1443 Batch 1 in Subcutaneous Doses to Rats

TEST SUBSTANCE

Identity: Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Synonym: Diethyltolenediamine (DETDA)

Remarks: R eferred to as Diethyltolamine Technical Experimental Product DD 1443 batch 1;
Conte nt of 72.8% 3,5

- diethyltoluene

- 2,4

- diamine and 26.2% 3,5

- diethyltoluene

- 2,6

- diamine (the remainder consists of unknown compounds)

METHOD

Method/guideline followed: Not indicated

Test type: Lifetime subcutaneous carcinogenicity study

GLP compliant?: Not indicated

Year study performed: Not indicated

Test species: Wistar rats (Winkelmann W 64 and GfVz

- Hannover)

Number of animals/sex/dose: Test animals: 10 females, 20/sex; Control animals: 10 females,
25/sex

Route of administration: Subcutaneous injection

Vehicle: Physiological saline

Exposure duration: 510 days

Doses/concentrations tested: 1.6 and 3.15 g/kg

- bw

Statistical methods used: None specified

Test method/conditions remarks: The LD 50 was determined after single subcut aneous doses to female specifically bred Winkelmann Wistar rats (W 64), weighing approximately 140 g. These were undiluted injections of the preparation. The LD 50 determined was 368 (338

- 400) mg/kg (p = 0.05). The surviving rats showed a continuous dege neration of general condition during the
four

- week observation period.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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161 In the main study, one group of Wistar rats (20 males and 20 females of Winkelmann strain) was injected subcutaneously over a time period of 510 days with up to a total of 1.6 g DETDA/kg bw. A second group of rats served as the controls (25 males and 25 f emales), and were injected with physiological saline. A third group of 10 female Wistar rats of GfVz

- Hannover strain

, which appeared less susceptible to DETDA toxicity was injected with approximately double the amount or a total of 3.15 g DETDA/kg bw. An imals were not subjected to a scheduled sacrifice. Rather, they were allowed to survive over their natural lifespan. The dose used in the study was
based on the LD 50 . The LD 50 via subcutaneously injection was determined to be 368 mg/kg, and
doses lower than this were selected for the carcinogenicity study.

RESULTS

Endpoint value(s): No evidence of carcinogenicity.

Results remarks: The average survival time of the 20 male Winkelmann rats treated with Diethyltolamine to a total dosage of 1.6 g/kg was 49 0 ± 349 experimental days. Of these 20 male rats, 4 died with one malignant tumor each. These included a spindle

- cell sarcoma of the larynx, a subcutaneous fibrosarcoma of the neck, a fibrosarcoma of the salivary gland, and a
subcutaneous fibrosarcoma in the cheek. Benign tumors developed: a cystic papilloma and two
subcutaneous fibromas.

The average survival time of the 20 female Winkelmann treated rats with Diethyltolamine 541 ± 262 experimental days. Of these 20 female rats, 2 died with one malignan t tumor each. One developed a uterine adenosarcinoma; the other developed a keratinized flat epithelial carcinoma of the breast. The benign tumors included 9 fibroadenomas of the breast, 10 uterine polyps, and 1 uterine myoma.

The 25 male rats in the control group had an average survival time of 834 ± 229 days. Four of them died with one malignant tumor each. These four tumors were: a skin carcinoma, a subcutaneous sarcoma of the head, an adenocarcinoma of the lung, and a polymorphous

- cells
carcinoma of the brain. Besides these, a benign tumor of the thymus developed.

The average survival time of the 25 female rats of the control group was 888 ± 177 days. Nine of these rats died of malignant tumors, three of which were double tumors. These include d: a large

- celled carcinoma of the lung, a carcinomatous deteriorated fibrolipoma of the breast, two adenocarcinomas of the breast, an ovarian carcinoma, a sarcoma of the thymus, three uterine adenocarcinomas, one case of myelogenous leukemia, a keratinize d flat epithelial carcinoma of the ear, and an adenocarcinoma of the thyroid gland. In addition, 14 benign tumors were observed, namely fibroadenomas of the breast.

The following results were observed with the 10 GfVz

- Hannover female Wistar rats used: th e average survival time was 568 ± 357 days. One of these rats died with two fibrosarcomas in the breast area. Besides these, 6 benign tumors developed

– 4 fibroadenomas of the breast, one uterine polyp, and a lipoma on the thorax.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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162 When the last of the 1 0 experimental rats of this group had died, 6 of 10 rats in the corresponding control group had died. Until this time, there had only been 5 benign tumors observed in the control group: 3 fibroadenomas of the breast and 2 uterine polyps.

CONCLUSIONS

The isomer compound Diethyltolamine technical Experimental Product DD 1443 batch 1 showed a clear toxicity after single subcutaneous doses to the rats (LD50 368 mg/kg), which showed itself primarily in a continuous degeneration of general condition. Conseque ntly, no high doses could be given in the Carcinogenesis Study (total dosage: 1.6 g/kg). In spite of this only moderately high total dosage, the survival time in the experimental group was clearly decreased in comparison to the control group (an average o f 516 days compared to 861 days).

All together, in the experimental group treated with technical isomer compound Diethyltolamine, among 40 rats (20 males, 20 females), there occurred 6 malignant tumors (15%), and 23 benign tumors (57%). In the control gr oup treated with physiological NaCl solution, 16 malignant (32%) and 15 benign tumors (30%) were observed among the 50 rats (25 males, 25 females).

The additional 10 female GfVZ Wistar rats proved to be somewhat more resistant to Diethyltolamine. As a re sult, they received a total dosage of the preparation injection which was approximately double (3.15 g/kg).

The survival time of these rats was also clearly reduced when compared to the corresponding rats treated with physiological NaCl solution. When the last experimental rat died, 4 of the animals in the control group were still living. Until this time, 2 malignant and 6 benign tumors had occurred in the experimental group: only 5 benign tumors had developed in the control group.

All together, then, among the 50 rats treated with technical Diethyltolamine, there developed 8 malignant tumors (16%) and 29 benign tumors (58%); among the 60 rats treated with physiological NaCl solution, 16 malignant tumors (27%) and 20 benign tumors (33%) were
observed.

There is, then, no indication from this study that technical isomer compound Diethyltolamine Experimental Product DD 1443 batch 1 has a carcinogenic effect after subcutaneous doses to rats. This conclusion is also reinforced by the fact that the malignan t tumors which occurred in the experimental group showed quite varied localization, as was the case in the control group. The benign tumors in the experimental group were primarily of the same type frequently occurring in the untreated rat breeds used.

T he high percentage of malignant and benign tumors in the control group can be explained by: 1) The special tendency of the breeds used toward tumor formation, and 2) the long survival times. It is also true that these animals were exposed to overall envir onmental conditions, and that, as is the case with man, cancer is primarily a disease of old age. The number of malignant tumors in the rats treated with Diethyltolamine

– almost half the number of the control group

– can be explained by the clearly reduc ed survival time.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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163 STUDY RELIABILITY

[2] Reliable with restrictions. Several details were missing from the study including test method/guideline followed, GLP compliance and statistical methods used.

REFERENCE

Steinhoff, D. 1972. Final Report on the Carcinogenesis Study with the Isomer Compound Diethyltolamine Technical Experimental Product DD 1443 Batch 1 in Subcutaneous Doses to Rats. Report No. 3709. Performing Laboratory: Bayer AG Toxicological Institute. Sponsor: Bayer AG, Germany.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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164 D

- 3. Skin Irritation

Study 1: Dermal irritation study in rabbits ( Heenehan et al.
, 1977 )

Title: Primary Dermal Irritation Study in Rabbits

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: C lear, light colored liquid; t he typical composition of the commercial product is 75

- 81% 3,5

- diethyltoluene

- 2,4

- diamine, 18

- 20% 3,5

- diethyltoluene

- 2,6

- diamine, 0.5

- 3% dialkylated

m

- phenylenediamines and < 0.08% water.

METHOD

Method/guideline followed: Not indicated

Test type: Primary Dermal Irritation

-- Rabbit

GLP compliant?: Not indicated

Year study performed: 1977

Test species: New Zealand White albino rabbits

Number of animals/sex/dose: 6 , sex not indicated

Route of administration: Dermal

Vehicle: None

Doses/concentrations tested: 0.5 mL

Statistical methods used: None

Test method/conditions remarks: The clipped skin of six New Zealand White albino rabbi ts was treated with 0.5 ml of DETDA at two sites: one abraded and one intact. Application sites
were covered with an impervious bandage. After 24 hrs, the bandage was removed. Observations
for dermal irritation or systemic toxicity were recorded at 24 and 72 hours after application.

RESULTS

Endpoint value(s): Slightly irritating. The primary dermal irritation index based on erythema,
edema and eschar formation was 1.7.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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165 Results remarks: None specified

CONCLUSIONS

The test substance was slightly irritating to rabbit skin.

STUDY RELIABILITY

[ 3] Not reliable. Important study details missing from the study summary included purity a nd composition of the test substance , test method/guidel ine followed, observed effects and interpretation of irritation scores.

REFERENCE

Heenehan

, P

. , Braun, W

. , and Rinehart

, W. 1977. Primary D ermal I rritation S tudy in R abbits. Compound: D iethylated T oluenediamine. Project No. 445 1

- 77. Performing Laboratory:
Bio/ dynamics Inc. Submitted by the Ethyl Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR
#335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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166 D

- 4. Eye Irritation

Study 1: Eye irritation study in rabbits ( Heenehan et al., 1977 )

Title: Rabbit Eye Irritation Study

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: C lear, light colored liquid; t he typical composition of the commercial product is 75

- 81% 3,5

- diethyltoluene

- 2,4

- diamine, 18

- 20% 3,5

- diethyltoluene

- 2,6

- diamine, 0.5

- 3% dialkylated

m

- phenylenediamines and < 0.08% water.

METHOD

Method/guideline followed: Not indicated

Test type: Primary Eye Irritation

-- Rabbit

GLP compliant?: Not indicated

Year study performed: 19 77

Test species: New Zealand White rabbits

Number of animals/sex/dose: 6 , sex not indicated

Route of administration: Ocular

Vehicle: None

Doses/concentrations tested: 0.1 mL

Statistical methods used: None specified

Test method/conditions remarks: One eye of each of six New Zealand White rabbits was
treated with 0.1 m L DETDA

. Observations were recorded for 14 days.

RESULTS

Corneal opacity and ulceration were noted in all treated eyes. Iritis was noted in 3 of 6 eyes, persisting in one eye through Day 2. All six eyes scored positively for conjunctival redness. One eye was free of all signs of irritation on Day 3, three eyes on Day 4 and 2 eyes on Day 10.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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167 Endpoint value(s): Irritating. A mean Draize Score of 27 was determined.

Results remarks: None specified

CONCLUSIONS

The test substance was irritating to rabbit eyes.

STUDY RELIABILITY

[ 3] Not reliable. Important study details missing from the study summary included purity a nd

c omposition of the test substance, test method/guideline followed and interpretation of irritation

scores.

REFERENCES

Heenehan

, P

. , Braun, W

. , and Rinehart

, W. 1977. Rabbit E ye Irritation S tudy. Compound:
D iethylated T oluenediamine. Project No. 4450

- 77. Perfromeing Laboratory: Bio/ dynamics Inc. Submitted by the Ethyl Corporation , Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531 , MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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168 D

- 5. Skin Sensitization

Study 1: Dermal sensitization study in guinea pigs ( Gabriel, 1979 )

Title: Guinea P ig C ontact D ermal I rritation /S ensitization

TEST SUBSTANCE

Identity: Benzenediamine, ar, ar

- diethyl

- ar

- methyl

- , CAS No. 68479

- 98

- 1; Synonym: Diethyltoluenediamine (DETDA); Purity not specified

Remarks: C lear, light colored liquid; t he typical composition of the commercial product is 75

- 81% 3,5

- diethyltoluene

- 2,4

- diamine, 18

- 20% 3,5

- diethyltoluene

- 2,6

- diamine, 0.5

- 3% dialkylated

m

- phenylenediamines and < 0.08% water.

METHOD

Method/guideline followed: Not indicated

Test type: Dermal Sensitization

– Guinea Pigs

GLP compliant? : Not indicated

Species/strain: Guinea Pigs, strain not indicated

Sex (male/female/both): Not indicated

Number of animals/sex/dose: 6 , sex not indicated

Dose/concentration: Six guinea pigs were treated with DETDA via intradermal injections administered every other day for a total of 10 injections. Ten sensitizing injections followed on the back and upper flanks. The first sensitizing injection consisted of 0.05 mL while the remaining 9 injections consisted of 0.1 mL each. Two weeks after the 10 th injection, a challenge injection of 0.05 mL was administered. Sites were scored at 24 and 48 hrs after the last injection. An additional 4 guinea pigs were treated as described above with the positive control, 0.1% dinitrochlorobenzene in ethylene dichlor ide.

Test condition: Not indicated

RESULTS

Endpoint value(s): Not sensitizing

.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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169 CONCLUSIONS

The test article was determined to be a primary skin irritant, but not a sensitizing agent in guinea pigs

.

STUDY RELIABILITY

[ 3] Not reliable. Important study details missing from the study summary included purity a nd

c omposition of the test substance, test method/guideline followed and findings/observations.

REFERENCES

Gabriel

, K. 1979. Guinea P ig C ontact D ermal I rritation /S ensitization. Pe rforming Laboratory: Biosearch, Inc

. Submitted by the Ethy l Corporation, Baton Rouge, LA. As cited in Albemarle Corporation. 2011. Letter to EPA DCO dated May 4, 2011. OPPT

- 2007

- 0531, MR #335194.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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- 1

17 0 D

- 6. Toxicokinetic Studies

Study 1: Toxicokinetic study in Fischer 344 rats ( Hainje and El

- hawari, 1982)

Title: Absorption, distribution, elimination, and bioretention of 14 C

- labeled diethyltoluenediamine following repeated oral dosing in rats

TEST SUBSTANCE

Identity: > 99% Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Referred to as Diethyl Toluene Diamine (DETDA)

Remarks: Technical grade (80:20 mixture of the 2,4

- and 2,

- 6 diamino isomers); Lot
XP213997A

METHOD

Method/guideline followed: Not indicat ed

Test type: Oral toxicokinetic study

GLP compliant?: Yes

Year study performed: 1981

- 1982

Test species: Fischer 344 rats (At the initiation of the studies, rats were 64

- 73 days old; the males weighed 158 to 228 g and the females weighed 102 to 154 g.)

Number of animals/sex/dose: 6

Route of administration: Oral

Vehicle: 0.05 N HCl

Exposure duration: 10 days

Doses/concentrations tested: 50 mg/kg

- bw

- bw

Statistical methods used: The means ± standard errors were calculated for each test group with a programmable (Monroe) calculator. The significance of the data was determined by the two

tailed Student's t test. Significant differences were indicated when p < 0.05.

Test method/co nditions remarks: The absorption, distribution elimination, and bioretention of technical grade diethyltoluenediamine (a mixture of the 2,4

- and 2,6

- diamino isomers) were examined in Fischer 344 rats treated with 10 daily doses (50 mg/kg

- bw) of the 14 C

- lab eled compound ( 14 C

- DETDA). Control rats received nine daily doses of the vehicle (0.05 N HCl)Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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171 followed by the tenth dose of 14 C

- DETDA. Levels of radioactivity in blood, urine, and feces were measured, and tissue levels were determined at 24 and 96 hr fol lowing the last dose.

14 C

- DETDA was administered to 6 rats by gavage at a dose level of 50 mg/kg (=  1/10 of the
LD 50 ) as specified by the sponsor. A limited preliminary study was also performed in two rats treated with a 10 mg/kg dose of 14 C

- DETDA. The dosing solutions were prepared by dissolving the appropriate amounts of the nonlabeled and 14 C

- labeled DETDA in a volume of 5 ml/kg of
0.05 N hydrochloric acid. Fresh dosing solutions were prepared for the pre liminary and
definitive studies in order to avoid any possible decomposition. Aliquots of each solution were
counted to determine the amounts of radioactivity. The dosing solutions used in this study
contained between 173 and 213 μCi of the labeled compound per 5 ml of the vehicle. When not in us e, the dose was stared frozen under argon, The stability of the dosing solution was checked periodically by radio

- gas chromatography.

Preliminary studies: The preliminary studies were performed with eight rats (four males and four females). Three males an d three females were treated with single oral doses of 50 mg/kg 14 C

DETDA. Blood levels were examined during a 24

- hr period in one male and one female rat. Another male and female rat were used to assess respiratory elimination of radioac tivity during a
48

- hr period. The remaining male and female rats were used to assess urinary and fecal excretion of radioactivity during a 96

- hr period. In addition, one male and one female rat were treated
with a lower (10 mg/kg) dose of 14 C

- DETDA and we re used to assess urinary and fecal excretion of radioactivity during a 96

- hr period. At sacrifice, tissues of all rats were examined for residual radioactivity ( see definitive studies).

For blood level determinations in the preliminary studies, samples w ere collected by tail bleeding at 0.25, 0.5, 1, 2, 4, 6, 8, 12 and 24 hr following dosing. During the experiment the rats were housed in individual stainless steel metabolism cages. Urine was collected at 4, 8, 12 and 24 hr, and feces were sampled at 12 and 24 hr, and then the rats were sacrificed.

Respiratory elimination of 14

- CO 2 or other volatile materials was assessed during 0

- 12, 12

- 24,
and 24

- 48 hr intervals following dosing. The rats were housed individually in Delmar

- Roth type glass metabolism cages. The CO 2 trapping solution was 5 M ethanolamine in 2

- methoxyethanol.
For collection of other volatile products, methanol: water (50:50) was used. Urine and feces were sampled during the same intervals, and the animals were sacrificed at 48 hr.

Urinary and fecal excretion were assessed during a 96

- hr period in one male and o ne female rat treated with a 50 mg/kg dose, and one male and female treated with a 10 mg/kg dose of 14 C

DETDA. The rats were placed in stainless steel metabolism cages and urine was sampled 4, 8, 12, 24, 48, 72 and 96 hr; feces were collected at 12, 24, 4 8, 72 and 96 hr following dosing, and
then the rats were sacrificed.

Definitive studies: A total of 24 rats (12 males and 12 fe males) were divided into two groups of
12 rats (6 males and 6 females) each. The rats in each group received either 10 daily do ses of

14 C

- DETDA or 9 daily doses of the vehicle followed by a tenth dose of 14 C

- DETDA. D aily dosing was performed between 8 and 9 a.m. After the last dose, the rats were placed in individual stainless steel metabolism cages. Three males and three females from each group were used forFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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172 blood level determinations. Blood samples were collected by tail bleeding at 0.5, 1, 2, 4, 8, 12,
and 24 hr. To assess total recovery, urine and feces were also collected. The rats were sacrificed

at 24 hr for tissue sampling (see b elow).

The remaining three rats/sex/group were used for assessment of urinary and fecal excretion of radioactivity. Urine was collected at 4, 8, 12, 24, 48, 72, and 96 hr. Feces were sampled at 12, 24, 48, 72, and 96 hr following the last d ose. After each collection the cages were rinsed and the cage washings sampled for radioactivity. The animals were sacrificed at 96 hr for analysis of radioactivity in tissues (see below).

The rats were sacrificed by withdrawal of blood from the abdominal aorta under light ether
anesthesia and the following tissues and organs were removed, weighed, and analyzed for radioactivity: liver, kidneys, lungs, heart, spleen, pancreas, brain, thyroids, adrenals, gonads, bone marrow, urinary bladder, skele tal muscle, retroperitoneal fat, skin and GI tract plus

contents.

Portions of blood were centrifuged; plasma and red blood cells (RBCs) were separated for radioactivity determinations. Prior to sampling, the RBCs were resuspended in 0.9% NaCl and
recentri fuged. The urinary bladder contents were removed and the bladders were washed thoroughly with 10% ethanol before analysis.

Sample Preparation and Analysis: Aliquots (50 to 250 μ) of whale blood, plasma, and RBCs were analyzed for total radioactivity. Volu mes of urine and cage rinse were measured and samples (250 μl) were analyzed. The trapping solutions for expired radioactivity were also measured, and samples (2 ml) were analyzed. Feces, GI tract, and tissues larger than 0.25 g were weighed and homogenize d in five volumes of ethanol:water (10:90). Samples (60 to 120 mg) of other organs and tissues were weighed and assayed for 14 C

- DETDA content. Blood components, tissues, and fecal samples were combusted in a Packard Tricarb Sample Oxi dizer (Model C306).
Pe rmafluor V® in combination with Carbo

- Sorb® (Packard Instrument Company) was used as the scintillation cocktail. Urine and cage rinses were counted directly in Phase Counting Solution (PCS, Amersham).

Measurement of Radioactivity: Vials were cooled for a minimum of 24 hr before counting in a liquid scintillation counter (Packard Tricarb Model 3255). Correction for background was carried out automatically on the counter. Background determinations were obtained from the average of
natural counts of several t issue homogenates from nontreated animals. The counting efficiency was determined using the automatic external standard (AES) method. An AES versus efficiency curve was prepared by processing a quench curve set through the counter under the conditions
used throughout the experiment. Assays not within ± 10% of the mean of the duplicates were reassayed in duplicate except when the sample was no longer available o r when radioactivity counts were low and nonsignificant, i.e., less than two times the background , 30 cpm (counts per minute).

Data Processing and Analysis: 14 C

- DETDA contents in blood and tissues were presented in terms of microgram equivalents per milliliter (blood) or gram (tissues), and percentage of the dose administered to each animal. Microgram equivalents per milliliter of blood, or gram ofFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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173 tissue were also presented in graphic form. Cumula tive excretion in urine and feces was calculated and presented in tables as well as in graphic form. The means ± standard errors were calculated for each test group with a programmable (Monroe) calculator. The significance of the data was determined by th e two

- tailed Student's t test. Significant differences were indicated when p < 0.05.

The percent of administered dose recovered in blood, muscle, and skin was calculated based on 7, 40, and 26%, respectively, of body weight. Percent recovery in plasma an d RBCs was
calculated based on 54 and 46%, respectively, of the total blood volume of each rat.

RESULTS

Preliminary Study: A single oral dose of 14 C

- DETDA was slowly absorbed and distributed to various organs and tissues. The compound and/or its metabolites were eliminated in urine and to a lesser extent in feces; excretion in expired air was negligible. Residual radioactivity in tissues was highes t in thyroids, followed by liver, kidneys, and adrenals. Male rats demonstrated higher
levels of 14 C

- in thyroids and liver than females.

Definitive Study: Following the last dose, rats treated with 10 doses of 14 C

- DETDA displayed significantly (up to 5

- fold) higher levels of radioactivity in blood than rats treated with one dose. The females demonstrated higher 14 C

- DETDA levels in blood than their male counterparts. No significant differences in urinary excretion of radioactivity was apparent between rat s of either treatment group. However, fecal excretion of was greater in rats treated with 10 doses as compared to those receiving 1 dose of 14 C

- DETDA . Female rats of both treatment groups eliminated higher amounts of 14 C

- DETDA in urine than their male coun terparts.

At 24 and 96 hr after the last doses, the concentration of ra6ioactivity in tissues was highest in thyroids, followed by liver, kidneys, and adrenals. 14 C

- DETDA levels in skin were higher than in fat or muscle. Rats treated with 10 doses displa yed significantly higher levels of 14 C

- DETDA in most tissues examined than those treated with one dose; the levels were up to 5

- fold higher at 24 hr and up to 6

- fold higher at 96 hr. At 24 hr, females of both treatment groups showed considerably lower amou nts of 14 C

- DETDA in liver but higher amounts in blood, RBCs, brain, spleen, and pancreas. At 96 hr, liver and thyroids of the females contained lower 14 C

- DETDA levels but differences in contents of other tissues were less apparent. Generally, disappearance of radioactivity from blood and tissues occurred at a faster rate in rats treated with 1 dose as compared to those receiving 10 doses of 14 C

- DETDA.

In rats tr eated with 10 doses of 14 C

- DETDA , recoveries of radioactivity at 24 hr in blood, muscle, skin, and tissues were 2

- to 3

- fold higher than in rats receiving one dose. Recoveries in the GI tracts did not differ significantly in the two treatment groups. At 36 hr, however, recoveries in the GI tracts as well as in blood, muscle, skin, and tissues were considerably (3

- to
6

- fold) higher in the rats treated with 10 doses.

Results remarks: Since control rats (i.e., nontreated with DETDA) were not included in the

s tudies, no at tempt was made t o statistically analyze the changes in bodyweight and organ weight parameters.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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174 CONCLUSIONS

The results of these studies indicate that 14 C

- labeled diethyl

- toluenediamine ( 14 C

- DETDA) administered orally to rats was slowly absorbed and distributed to various organs and tissues. The compound and/or its metabolites were eliminated in urine and to a lesser extent in feces; excretion in the expired air was negligible. Radioactivi ty recovered in tissues at 24 and 96 hr after dosing was highest in the thyroids, followed by liver, kidneys, and adrenals. Levels of radioactivity in blood and tissues of female rats were generally higher than in males; 14 C levels in liver and thyroids w ere higher in the males.

Treatment of Fischer 344 rats with 10 daily oral doses of the 14 C

- labeled compound resulted in significantly higher blood levels of 14 C compared to those of rats receiving one dose (vehicle

pretreated controls). Although the rate s of urinary excretion were similar in both treatment groups and the rates of fecal excretion were higher in the rats pretreated with 14 C

- DETDA, the amounts of radioactivity retained in blood and tissue of the latter group were considerably higher
than tho se of the vehicle

- pretreated controls. If the retained radioactivity, however, is expressed as percentages of the total (10) administered doses, the amounts recovered in blood and tissue
were lower than in the vehicle

- pretreated controls.

The data obtain ed from these studies did not indicate an impairment of the excretory functions in rats pretreated with 14 C

- DETDA. Therefore, the retention of radioactivity in blood and tissues of rats receiving the 10 daily doses of the labeled compound suggests that th e 14 C level (probably from metabolites) binds to certain blood and tissue components. Definitive explanations of these findings require further assessment of the biotransformation and disposition of DETDA at several dose levels and its possible interactio n with blood and tissue macromolecules.

STUDY RELIABILITY

[2] Reliable with restrictions. The test method/guideline followed was not specified

.

REFERENCE

Hainje, M. and El

- hawari, A. 1982. Absorption, Distribution, Elimination, and Bioretention of

14 C

- Labeled Diethyltoluenediamine Following Repeated Oral Dosing to Rats. MRI Project No.
7348

- B. Performing Laboratory: Midwest Research Institute, Kansas City, MO. Sponsor: Ethyl Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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175 Study 2: Toxicokinetic study in Sprague Dawley rats ( Babin et al., 1996)

Title: The uptake and distribution of diethyltoluenediamine in the male Sprague Dawley rat

TEST SUBSTANCE

Identity: Tritiated Benzenediamine, ar,ar

- diethyl

- ar

- methyl, CAS No. 68479

- 98

- 1; Referred to as Diethyl Toluene Diamine (DETDA); Ethacure

Remarks: Ethacure is a mixture of compounds composed mostly of 2 major isomers, 2,4

- DETDA (75

- 81%) and 2,6

- DETDA (18

- 20%). The test solution was tritiated 2,6

- DETDA or 2,4

- DETDA diluted with non

- tritiated Ethacure (84μmol/ml) in water to provide a labeled mixture with a specific activity of 0.295

- 0.48 μCi/μmol.

METHOD

Method/guideline followed: Not indicated

Test type: Oral toxicokinetic study

GLP compliant?: Not indicated

Year study performed: 1996 (final report date)

Test species: Sprague Dawley rats (10

- 12 weeks, 159

- 296 g)

Number of animals/sex/dose: Preliminary study: 1 control male, 3 treated males; Tissue distribution study: 10 groups of 4 males; Elimination study: 10 males

Route of administration: Oral (gavage)

Vehicle: Tritiated 2,4

- and 2,6

- DETDA were diluted with non

- tritiated Ethacure (84μmol/ml) in

water

Exposure duration: Single dose

Doses/concentrations tested: 179 μ mol/kg

- bw

Statistical methods used: None specified

Test method/conditions remarks: Using synthesized acetylated DETDA standards, a preliminary rat study was performed to determine the extent of acetylation occurring wi th DETDA during metabolism.



### In the preliminary study, one group of 4 young adult (10

- 12 weeks) male Sprague Dawley rats (1 control and 3 treatment, 172

- 186 g) were administered a single dose of vehicle or theFinal HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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176 

### commercial DETDA product in water at 179 μmo l/kg bw. Urine was collected via metabolism cages (0

- 4, 4

- 8, 8

- 16 and 16

- 32 hrs). Urine samples were prepared for analysis using the solid phase extraction protocol.

Distribution Study: Ten groups (5 per isomer) of 4 young adult male Sprague Dawley ra ts each were administered a single dose of tritiated 2,4

- or 2,6

- DETDA diluted with non

tritiated Ethacure in water (to provide a labeled mixture with a specific activity of 0.46 μCi/μmol) at179 μmol/kg bw) via gavage. Urine, feces, blood and tissues were collected at 1, 4, 8, 24 and 48 hours post

- dosing in individual metabolism cages. A day 6 tissue distribution time point was incorporated in the 6 day excretion stud y described below. Rats
were anesthetized with isoflurane at each time point . Blood was collected via cardiac puncture at each time point. The following tissues were removed from each rat at the time of
death: fat (epididymal fat pad), skin (ventral midline), skeletal muscle (right quadriceps), thymus, lung (right caudal lobe), heart (apex), spleen (caudal end), pancreas, bladder, kidney (right caudal area), liver (right caudal lobe), stomach (greater curvature), proximal duodenum, caecum (apex), colon (proximal ascending), thyroid, and brain (right frontal lobe).

Excretion Stu dy: Ten (5 per isomer) young adult male Sprague Dawley rats were administered a single dose of tritiated 2,4

- or 2,6

- DETDA diluted with non

- tritiated Ethacure in water (to provide a labeled mixture with a specific activity of 0.48 μCi/μmol) at 179 μmol/kg bw) via gavage. Urine and feces were collected from individual metabolism cages at 24 hour intervals over 6 days post

- dosing. On day 6 rats were sacrificed and blood was collected via cardiac puncture. Contents from the stomach, small intestine, caecum , and large intestine were added to the day 6 time points. The following tissues were removed
from each rat at the time of death for a day 6 distribution study: fat (epididymal fat pad), skin (ventral midline), skeletal muscle (right quadriceps), thymus, lung (right caudal lobe), heart (apex), spleen (caudal end), pancreas, bladder, kidney (right caudal area), liver (right caudal lobe), stomach (greater curvature), proximal duodenum, caecum (apex), colon (proximal ascending) and brain (right frontal lobe).

Covalent Binding Study: Three young adult male Sprague Dawley rats were administered a single dose of tritiated 2,4

- or 2,6

- DETDA diluted with labeled Ethacure (to attain a specific activity of 8.42 μCi/μmol) at 179 μmol/kg bw via gavage. Rats were sac rificed 24 hours after dosing at which time the livers were harvested, weighed and prepared for DNA extraction, nucleic acid and protein precipitation.

RESULTS

In the preliminary study, o nly 2 of the 3 rats administered Ethacure were quantitatively eva luated because of the questionable dosage administered to one of the rats. In the first rat, 4.0% of the administered dose was recovered in the urine as both 2,4

- and 2,6

- DETDA (parent compound) by 32 hours. In the second rat, 4.4% of the administered do se was recovered as both 2,4

- and 2,6

- DETDA. None of the expected acetylated DETDA metabolites were detected in the urine above 500 ng/ml (limit of quantitation) in any of the 3 rats treated.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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177 The data showed very high levels of label occurred in the gastrointestinal system and bladder during the first 8 hours reflecting compound that was either unabsorbed, distributed or excreted. The metabolic and excretory organs, liver and kidney, also showe d moderate levels. Label in the thyroid and pancreas was much higher than expected, for non

- excretory organs, with thyroid levels exceeding; even that of liver tissue. The concentration of radioactivity in all tissues except the stomach, duodenum, caecum, colon, bladder and thyroid was greatest at 4 hours. With the exception of the stomach, duodenum, caecum, colon, bladder and thyroid, tissues exhibited a classic biphasic model d distribution and excretion with the onset of the slow phase occurring
after th e 4 hour time point. Thyroid levels, at 24 and 48 hours, were the highest of all tissues examined at that time point. As can be gleaned from the 24 and 48 hour time frames, DETDA was rapidly cleared from all tissues. Day 6 residual levels of label were fai rly uniform in all tissues examined. Distribution levels for day 6 thyroid were unavailable, but the 48 hour time point values suggested that the thyroid levels at day 6 were probably elevated relative to other
tissues.

The data revealed the highest level s of label occurred in the gastrointestinal system during the first 8 hours reflecting both absorbed and possibly unabsorbed 2,6

- DETPA. Relatively high
levels of radioactivity was present in the bladder for the first 8 hours presumably reflecting both
dist ributed and excreted compound. The metabolic and excretory organs, liver and kidney, contained moderate levels of label in relatively equal amounts. Label in the thyroid and pancreas was much higher than expected, for nonexcretory organs, with thyroid leve ls exceeding even that
of Fiver tissue. The concentration of radioactivity in all tissues except the stomach, caecum, colon, thyroid, pancreas and spleen was greatest at 4 hours. With the exception of the stomach, thyroid, pancreas and spleen, tissues exhi bited a classic biphasic model of distribution and excretion with the onset of the slow phase occurring after the 4 hour time point. As can be seen from the 24 and 48 hour time frames, DETDA was rapidly cleared from all tissues. Day 6
residual levels of la bel was uniform in all tissues except the thyroid gland which was almost 4 fold higher than any other tissue.

These distribution profiles of labeled DETDA indicates the compound has both water and fat soluble properties. There appears to be little differe nce in the pattern of distribution between the 2,4

- DETDA and the 2,6

- DETDA isomers with the possible exception of the thyroid gland.

Differences in the excretion profile between the 2,4

- and 2,6

- DETDA isomers seem to signify
variations in the biotransform ation of each compound. The greater urinary excretion of 2,6

- DETDA (58%) compared to 2,4

- DETDA (44%) suggests a more excretable, water soluble metabolite may have been produced. This could be accomplished by greater phase II conjugation reactions (glucuro nidation, sulfation, glutathione) on the 2,6

- isomer compared to the 2,4

- isomer. Restricted enzymatic access due to the flanking of the 4

- position amino group by benzylic ethyl groups on the 2,4

- isomer could effect these results.

Analysis of the data from the 24

- hour time point urine samples revealed that 1 8.2% of labeled material was contained in the organic fraction. Acid hydrolysis demonstrated that 37.6% of the
labeled material was in the form of acid

- labile conjugates. The remaining 44.2% of the lab eled material was composed of the non acid

- labile water soluble fraction.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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178 Relative to Ethacure (80.8% 2,4

- DETDA, 19.2% 2,6

- DETDA), 1 6 pmol of 2,4

- DETDA/μmol of DNA and 5 pmol of 2,6

- DETDA/μmol of DNA was found covalently bound. For the 2,4

- DETDA isomer, 55% of the label was bound to the protein fraction equating to 108 nmol 2,4

- DETDA per gram of liver protein. With the 2,6

- DETDA isomer, 38% of the label was bound to the protein fraction equating to 31 nmol 2,6

- DETDA per gram of liver protein. These resul ts suggest that compared to TDA, both 2,4

- and 2,6

- DETDA are less likely to be involved in covalent binding to DNA.

Results remarks: None specified

CONCLUSIONS

DETDA is absorbed after oral administration, and eliminated in the urine and feces. The presence of conjugated metabolites in urine was indicated; however, alkylated metabolites were not detected in urine. Roughly equivalent concentrations, on a μmol/g basis, were detected in the thyroid, pancreas and liver.

STUDY RELIABILITY

[2] Reliable with restrictions. Details missing from the study included test substance purity, method/guideline followed and GLP compliance.

REFERENCE

Babin, M.C., Swenson, D.H., Short, C.R., and Barker, S.A. 1996. The Uptake and Distribution of Diethyltoluenedia mine in the Male Sprague Dawley Rat. LSU School of Veterinary Medicine. Baton Rouge, LA. Sponsor: Albemarle Corporation, Baton Rouge, LA.Final HPV2 Chemical Data Adequacy Review (May 2012 Update) CAS No. 68479

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179 E

. DATA ADEQUACY SUMMARY TABLE

Endpoint Study Information
Available Acceptable Data Gap

Aquatic Effects Acute Toxicity to Fish No

– Yes Acute Toxicity to Daphnia No

– Yes Toxicity to Aquatic Plants (Algae) Yes Yes No
Health Effects Acute Toxicity Yes Yes No Repeated

- Dose Toxicity Yes Yes No
Gene Mutation Yes Yes No
Chromosomal Aberrations Yes Yes No

Reproductive Toxicity No

– Yes Developmental Toxicity No

– Yes