Potassium arsenite

  • Potassium arsonate
Formula
K3AsO3
Structure
Description
A white powder.
Uses
Substance is used in production of mirrors to reduce the silver salt to metallic silver, herbicide, insecticide, rodenticide.

Registry Numbers and Inventories.
CAS
10124-50-2
EC (EINECS/ELINCS)
233-337-9
RTECS
CG3800000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Drug; Mutagen; Human Data
UN (DOT)
1678
Beilstein/Gmelin
140749 (G)
RCRA
D004
EPA OPP
13605
Swiss Giftliste 1
G-7422
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
AsK3O3
Formula mass
240.22
Decomposition point, °C
300
Vapor density (air=1)
8.76
Odor Threshold Odor threshold Odorless
Solubility in water
Soluble, hydrolyses
Refractive index
1.54

Hazards and Protection.
Storage
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
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Add calcium hypochlorite (Ca(ClO)2). Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Add ferric chloride (FeCl3). Adjust pH to neutral (pH=7). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Not stable; arsenites of alkali metals are slowly converted in solution to arsenates by atmospheric oxygen.
Incompatibilities
Reacts as bases to neutralize acids.

Fire.
Fire fighting
Keep unnecessary people away; stay upwind; keep out of low areas. Wear full protective clothing and self-contained breathing apparatus.Extinguish with dry chemical, carbon dioxide, water spray or foam.
Fire potential
Nonflammable.
Hazards
Unstable. Avoid aeration.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV (as As): ppm; 0.2 mg/m3 (ACGIH 1991-1992).
Carcinogin
O, G-A1, I-1, N-1, CP65
Poison_Class
1
Exposure effects
Patients may rapidly become hypotensive. Rapid heart rate may develop secondary to pain, hypovolemia, cardiac effects of arsenic or anxiety. Toxic delirium and encephalopathy are possible complications. Peripheral neuropathy is common. Seizures may occur. Arsenic is likely fetotoxic in humans but is NOT likely to be a significant risk to human reproduction at permissible occupational exposure limits. <br>Arsenic can cross the placenta. Arsenic is excreted in the breast milk in both experimental animals and humans. <br>Fertility does not seem to be affected in either males or females. Systemic toxicity was present before any effects were noted on the testes.
   Ingestion
Early symptoms within hours following arsenic ingestion include abdominal pain, vomiting, profuse bloody or watery (rice-water-like) diarrhea, pain in the extremities and muscles, weakness, and flushing of the skin.
   Inhalation
Acute respiratory failure was seen in a patient with severe arsenic poisoning. Pulmonary edema may occur and be life-threatening. Adult respiratory distress syndrome (ards) has been reported.
   Skin
Common skin findings may include flushing, diaphoresis, palmar hyperkeratosis, peripheral edema, hyperpigmentation, brawny desquamation, and exfoliative dermatitis. Transverse white striae of the nails may be seen. Shingles (herpes zoster) may also be a complication.
   Eyes
Blurred vision and a unilateral widely dilated pupil have been observed. Inflammation of the eye, photophobia, dimness of vision, diplopia, and tearing may occur. A garlic-like odor may be detected on the breath.

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
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. Alkalinization of the urine may prevent deposition of red cell breakdown products from hemolysis in renal tubular cells. Urine alkalinization administer 88 to 132 meq/l sodium bicarbonate and 20 to 40 meq kcl (as needed) in dextrose 5% in water to produce a urine ph of at least 7.5 And a urine output fo 1 to 3 ml/kg/hr.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. No cases of systemic arsenic poisoning following only eye exposure have been reported. If significant eye irritation is present, prolonged initial flushing and initial ophthalmologic consultation are advisable.

Transport.
UN number
1678
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
POA
 
Std. Transport #
4923278