\ 

## Chemicals That 

## Were 

## Assigned Threshold Planning Quantities Different From

## the Calculated 

## Index Value 

# The following 

## table 

## shows 

## thename 

## and CAS 

## number of 

## chemicals 

## chat were 

## assigned 

## different Threshold 

## Planning 

## Quantities (TPQs) from 

## their calculated index 

## value. 

## The reassignments 

## were made after a 

## chemical-by-chemical review of 

## theTFQs 

## by Agency 

## toxicologists, engineers 

## and 

## chemists.. As 

## the TPQs 

## are designed to 

## alert communities to 

## potential 

## hazards from the presence 

## of extremely 

## hazardous substances, it was 

## important to

## determine whether the 

## values 

## assignedware appropriate 

## for 

## all the 

## physical 

## and chemical 

## attributes of the 

## individual substances. The rationale 

## for reassignment 

## is given on the 

## table. The 

## table 

## deals 

## with ths 

## reassigned substances 

## in. alphabetical order.

# - P.3 7

## -

. 

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### . I



### . I

r, 'a



### Assigned TP9 

### Reassigned TPQ CAS 

### Number 

### Chemi

### cai (

## in pounds) ( 

### in pounds) Rationale 

## ror Reassignment


### 298

# -00-0 Parathion-methy I 

### 10 

### 1OO/lO,OOO Widely used pesticides are rtrlL of Tir-st 

### concern. This silbstance should l~;~vo ;r 

### s~r~+i lar 

### 'IPQ to Parathion and Aldicarb. 2587-90-8 Phosphorothiaic acid, 

### 1000 500 This 

### conapoirnd IS sim~ far to denlet011 ;II#~ rl~ot~id 

### 0,O-dimethyl-S- be 

### assigned the 

### same TPQ. (2-methylphi01 

### ethyl 

### ester 129-00-0 ~y

### rene I00 lOOO/lO,UOO The toxiclty 

### data llsed for the calculation 

### may indicate a higher 

### value ttran warranted. It 

### is a 

### common laboratory reagent. 

### 57-24-9 Strychnine 

### 10 

### lOO/lO,OOO This 

### should have a similar TPQ to strychnine 

### sulfate. Its use as a rat poison would 

### necessita 

### te reporting by 

### grocery and ha

### rdwa

### re stores iF it

### were assigned 

### a very low TPQ. 

### 77-81-6 

### Tabun 10 [his chemical is

### a warfare 

### agent and is rapidly and 

### irreversibly toxic. 

### 78-00-2 Tetrae

### thyllead 100 This compound is rapidly absorbed and 

### irreversibly 

### toxic. 

### 597-64-8 Tetraethyltin 100 This compound is

### very volatile 

### and 

### irreversiblytoxic. Itshould have 

### a similar 

### TPq 

### to tetraethy

### l lead. 

### 75-74-1 Tetramethyl 

### lead 100 This 

### compound is rapidly 

### absorbed and irreversibly 

### toxic. 

### 6633-73-9 T

### hal l

### ous carbona

### ce 100/1U,~OO 

### A generic 

### tDtH value for tha

### ll ium salts

### was 

### used to recalculate 

### the TPQ, previously calculated 

### from a 

### toxicity value. 

### 7791

# -12-0 TliaI

### lous 

### chloride lOO/lO,OOO A generic lDLH 

### value for thall 

### ium salts 

### was used to recalculate the 

### TPQ, previously 

### calculated Yrom a toxicity 

### value. 2757- 18-8 Thall

### ous ma

### lona

### te lOO/lO,OOO 

### A generic 

### lDLH value for thallium salts 

### was used 

### to recalculate 

### the TPQ, previously calculated 

### from a 

### toxicity value. 2001

### -95-8 Valinomycin lOOO/lO.OOO This 

### compound is

### an ant~biotic.



# -
P.

. ..--- 

### -. p P