Calcium arsenite

  • Calcium meta-arsenite
  • Monocalcium arsenite
Formula
CaHAsO3
Structure
Description
A white granular powder.
Uses
As insecticide, germicide, molluscicide.

Registry Numbers and Inventories.
CAS
52740-16-6
EC (EINECS/ELINCS)
258-147-3
RTECS
CH9492050
RTECS class
Tumorigen
UN (DOT)
1574
Beilstein/Gmelin
379932 (G)
RCRA
D004
Austrailia AICS
Listed

Properties.
Formula
As2HO4.Ca
Formula mass
254.93
Odor Threshold Odor threshold Odorless
Density
3.031 g/cm3 (20 C)
Solubility in water
slightly soluble

Hazards and Protection.
Storage
On board ships material may be stowed on deck or under deck though under deck is preferred. Keep containers tightly closed in a well ventilated area away from food products. Keep away from heat and water.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
At concentration above the NIOSH rel, or where there is no rel, at any detectable concn. Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive pressure-mode. 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 breathing apparatus operated in pressure-demand or other positive-pressure mode.
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers.
Stability
Not
Incompatibilities
When water soln of arsenicals are in contact with active metals such as arsenic, iron, aluminum, zinc, highly toxic fumes of arsenic including arsine are released. Avoid contact with strong oxidizers, bromide azide

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use alcohol foam, dry chemical or carbon dioxide. Keep run-off water out of sewers and water sources.
Fire potential
Non-Combustible
Hazards
Containers may explode when heated. Runoff may pollute waterways.
Combustion products
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Health.
Exposure limit(s)
IDHL: NIOSH considers calcium arsenite to be a potential occupational carcinogen.
Carcinogin
O, G-A1, I-1, N-1, CP65
Exposure effects
Abnormally low blood pressure and rapid heart rate are common early signs. Fever and rapid breathing may occur. Elevated blood pressure has been associated with chronic environmental arsenic exposure. Altered mental status, seizures, toxic delirium, encephalopathy, and delayed peripheral neuropathy are complications of acute arsenic poisoning. Inorganic arsenic crosses the placenta and may result in spontaneous abortion or stillbirth with either acute or chronic poisoning.
   Ingestion
Acute toxicity results in early symptoms of abdominal pain, severe vomiting and diarrhea, as well as dryness of the oral and nasal cavities.
   Inhalation
Respiratory tract irritation may occur. Cardiogenic or noncardiogenic pulmonary edema and respiratory failure may develop in severe poisonings.
   Skin
Skin findings may include hyperpigmentation, keratoses, and epidermoid carcinomas. Mee's lines of the nails are common. Trivalent arsenic compounds are corrosive to the skin. Arsenic trioxide and pentoxide are sensitizers.
   Eyes
As(III) is corrosive to the eyes, mouth, and mucous membranes. Perforation of the nasal septum can occur.

First aid
 
   Ingestion
Gastric decontamination - aggressive decontamination with gastric lavage is recommended. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Take victim to clean area.
   Skin
Flush thoroughly with water.
   Eyes
Flush with water.

Transport.
UN number
1574
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
CAS
 
Std. Transport #
4923450