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Calcium arsenate (as As)																				Related Pages
										May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
**CAS number:** 7778-44-1
**NIOSH REL:** 0.002 mg/m3 15-minute CEILING; NIOSH considers calcium arsenate to be a potential occupational carcinogen as defined by the OSHA carcinogen policy [29 CFR 1990].
**Current OSHA PEL:** 0.010 mg/m3 TWA
**1989 OSHA PEL:** Same as current PEL
**1993-1994 ACGIH TLV:** 0.01 mg/m3 TWA, A1
**Description of Substance:** Colorless to white, odorless solid.
**LEL:** Noncombustible Solid
**Original (SCP) IDLH:** 100 mg As/m3
**Basis for original (SCP) IDLH:** Because no data on acute inhalation toxicity are available for calcium arsenate, the chosen IDLH is based on an analogy with arsenic and compounds (as As) which has an IDLH of 100 mg As/m3.
**Short-term exposure guidelines:** None developed
**ACUTE TOXICITY DATA**
**Lethal dose data:**

**Species**
    **Reference**
    **Route**
    **LD50** **(mg/kg)**
    **LDLo** **(mg/kg)**
    **Adjusted LD**
    **Derived value**Rat RatMouseRabbitDog
    Back et al. 1972 Lehman 1951MacEwen and Vernot 1972Muehlberger 1930Perkow 1971/1976
    oral oraloraloraloral
    812 207945038
    ----- --------------------
    2,103 mg As/m352 mg As/m32,056 mg As/m3132 mg As/m398 mg As/m3
    210 mg As/m35.2 mg As/m3206 mg As/m313 mg As/m39.8 mg As/m3**Human data:** None relevant for use in determining the revised IDLH.
 
 **Revised IDLH:** 5 mg As/m3**Basis for revised IDLH:** No inhalation toxicity data are available on which to base an IDLH for calcium arsenate. Therefore, the revised IDLH for calcium arsenate is 5 mg As/m3 based on acute oral toxicity data in animals [Lehman 1951] and to be consistent with the revised IDLH for other inorganic arsenic compounds which have a revised IDLH of 5 mg As/m3. [Note: NIOSH recommends as part of its carcinogen policy that the "most protective" respirators be worn for calcium arsenate at concentrations above 0.002 mg As/m3. OSHA currently requires in 29 CFR 1919.1018 that workers be provided with and required to wear and use the "most protective" respirators in concentrations exceeding 20 mg As/m3 (i.e., 2,000 × the PEL).]
**REFERENCES:**
1. Back KC, Thomas AA, MacEwen JD [1972]. Reclassification of materials listed as transportation health hazards. Wright-Patterson Air Force Base, OH: 6570th Aerospace Medical Research Laboratory, Report No. TSA-20-72-3, pp. A-30 to A-31.
2. Lehman AJ [1951]. Chemicals in foods: a report to the Association of Food and Drug Officials on current developments. Part II. Pesticides. Q Bulletin Assoc Food Drug Off U.S. *15*(4):122-125.
3. MacEwen JD, Vernot EH [1972]. Toxic Hazards Research Unit annual technical report: 1972. Wright-Patterson Air Force Base, OH: Aerospace Medical Research Laboratory, Report AMRL-TR-72-62.
4. Muehlberger CW [1930]. Toxicity studies of fluorine insecticides. J Pharmacol Exp Ther *39*:246-248.
5. Perkow W [1971/1976]. Wirksubstanzen der Pflanzenschytz and Schadlingsbekampfungsmittel. Berlin, Germany: Verlag Paul Parey (in German).

			
							
								Page last reviewed:  December 4, 2014						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Publications & Products
Immediately Dangerous To Life or Health (IDLH) Values
Table of IDLH Values
Criteria for Determining IDLH Values
Historical Documentation
Original (SCP) Values
Abbreviations for IDLH Documentation
Abbreviations for Journal Titles Follow NIOSH Facebook
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