NIOSH Pocket Guide to Chemical Hazards

Calcium arsenate (as As)

CAS 7778-44-1


RTECS CG0830000
Synonyms & Trade Names
Calcium salt (2:3) of arsenic acid, Cucumber dust, Tricalcium arsenate, Tricalcium ortho-arsenate [Note: Also see specific listing for Arsenic (inorganic compounds, as As).]
DOT ID & Guide
1573 151


NIOSH REL: Ca C 0.002 mg/m3 [15-minute] See Appendix A
OSHA PEL: [1910.1018] TWA 0.010 mg/m3
IDLH Ca [5 mg/m3 (as As)] See: 7778441 Conversion
Physical Description
Colorless to white, odorless solid. [insecticide/herbicide]
MW: 398.1
BP: Decomposes
MLT: ?
Sol(77°F): 0.01%
VP: 0 mmHg (approx)

Sp.Gr: 3.62
Fl.P: NA

Noncombustible Solid
Incompatibilities & Reactivities
None reported [Note: Produces toxic fumes of arsenic when heated to decomposition.]
Measurement Methods
NIOSH 7900; OSHA ID105
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated/Daily
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Lassitude (weakness, exhaustion); gastrointestinal disturbance; peripheral neuropathy; skin hyperpigmentation, palmar planter hyperkeratoses; dermatitis; [potential occupational carcinogen]; in animals: liver damage
Target Organs Eyes, respiratory system, liver, skin, central nervous system, lymphatic system

Cancer Site [lymphatic & lung cancer]
See also: INTRODUCTION   See ICSC CARD: 0765