Arsenic

  • Gray arsenic
Formula
As
Structure
Description
A silver-grey brittle, crystalline, metallic-looking substance odorless.
Uses
Alloying constituent.

Registry Numbers and Inventories.
CAS
7440-38-2
EC (EINECS/ELINCS)
231-148-6
EC Index Number
033-001-00-X
EC Class
Toxic
RTECS
CG0525000
RTECS class
Tumorigen; Drug; Mutagen; Reproductive Effector; Human Data
UN (DOT)
1558
Merck
12,832
Beilstein/Gmelin
16247 (G)
RCRA
D004
Swiss Giftliste 1
G-1999
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
As
Formula mass
74.92
Melting point, °C
817
Vapor pressure, mmHg
3.1 (400 C)
Vapor density (air=1)
5.7
Critical temperature
1400
Critical pressure
220
Density
5.727 g/cm3 (20 C)
Solubility in water
Insoluble
Refractive index
3.54
Thermal expansion
1.44E-5/K (20 C)
Heat of fusion
27.7 kJ/mol

Hazards and Protection.
Storage
Protect container against physical damage. Store in well ventilated area away from food or food products and combustible materials.
Handling
Use of approved respirators is required for applications where adequate ventilation cannot be provided. Activi- ties which generate dust or fume should be avoided. When melted, the temperature should be kept as low as possible.
Protection
Wear appropriate protective gloves, clothing and goggles.
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. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Water spill: Use natural barriers or oil spill control booms to limit spill travel. Use natural deep water pockets, excavated lagoons, or sand bag barriers to trap material at bottom. Remove trapped material with suction hoses.
Stability
Slight - as dust. Reactive only under extreme conditions.
Incompatibilities
Reacts incandescently with bromine trifluoride, even at 10C Reacts readily in the cold with arsenic React vigorously with fluorine at ordinary temperatures.
Decomposition
When arsenic is heated in air it will burn and form a white smoke consisting of arsenic trioxide (as2o3).

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 foam, dry chemical, or carbon dioxide.
Fire potential
Moderate in form of dust when exposed to heat or flame or by chemical reaction with powerful oxidizing agents.
Hazards
Containers may explode when heated.
Combustion products
Contain highly toxic arsenic trioxide and other forms of arsenic.
Health
3
 
Flammability
2
 

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
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
1558
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
ARX
 
Std. Transport #
4923207