Arsenic acid, solid

  • Orthoarsenic acid
Formula
H3AsO4
Structure
Description
White crystals. There is a second UN number (1553) for Arsenic acid, liquid. It has the same guide.
Uses
Rodenticide, acaricide.

Registry Numbers and Inventories.
CAS
7778-39-4
EC (EINECS/ELINCS)
231-901-9
RTECS
CG0700000
RTECS class
Agricultural Chemical and Pesticide; Mutagen; Reproductive Effector
UN (DOT)
1554
Merck
12,833
Beilstein/Gmelin
2294 (G)
RCRA
P010
EPA OPP
6801
Swiss Giftliste 1
G-1144
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
AsH3O4
Formula mass
141.94
Melting point, °C
35.5
Boiling point, °C
160
Density
2.2 g/cm3 (20 C)
Solubility in water
16.7 g / 100 ml
pKa/pKb
3.09 (pKa)

Hazards and Protection.
Storage
Protect container against physical damage. Store in well ventilated area away from food or food products and combustible materials.
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 protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Neutralizing Agents for Acids and Caustics: Flush with water, rinse with sodium bicarbonate or lime solution.
Stability
No data.
Incompatibilities
Reacts with alkalis to generate some heat and precipitate arsenates.
Decomposition
Dangerous when heated to decomposition, emits toxic fumes of arsenic, including arsine.

Fire.
Fire fighting
SMALL FIRES: Dry chemical, carbon dioxide or water spray. LARGE FIRES: Dry chemical, carbon dioxide, alcohol-resistant foam or water spray. Move containers from fire area if you can do it without risk. Dike fire control water for later disposal; do not scatter the material. FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire.
Fire potential
Non-combustible
Hazards
Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Combustion products
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Health
3

Health.
Exposure limit(s)
TLV (as As): ppm; 0.01 mg/m3 A1 (ACGIH 1997). MAK: class III A1 (1997).
Carcinogin
O, G-A1, I-1, N-1, CP65
Poison_Class
1
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
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Wash well with soap and water.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
1554
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
ASA
 
Std. Transport #
4923105