# NIOSH Pocket Guide to Chemical Hazards
Calcium arsenate (as As) | CAS 7778-44-1
Ca3(AsO4)2 | 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
Exposure Limits | 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)] | 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) | IP: NA |  | Sp.Gr: 3.62
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid
Incompatibilities & Reactivities None reported [Note: Produces toxic fumes of arsenic when heated to decomposition.]
Measurement Methods NIOSH 7900; OSHA ID105
Personal Protection & Sanitation 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
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 Escape: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/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