Arsenic trisulfide

  • Arsenic sulfide, yellow
  • Arsenic sesquisulfide
  • Arsenic (III) sulfide
Formula
As2S3
Description
Yellow or red powder or crystal.
Uses
Production of glass, particularly infrared-transmitting glass.

Registry Numbers and Inventories.
CAS
1303-33-9
EC (EINECS/ELINCS)
215-117-4
RTECS
CG2638000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen
UN (DOT)
1557
Merck
12,846
Beilstein/Gmelin
11100 (G)
RCRA
D004
EPA OPP
6901
Swiss Giftliste 1
G-1149
Canada DSL/NDSL
DSL
US TSCA
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
As2S3
Formula mass
246.02
Melting point, °C
300
Boiling point, °C
707
Odor Threshold Odor threshold Odorless
Density
4.25 g/cm3
Solubility in water
Reacts.
Thermal expansion
0.00003/K
Heat of fusion
30.05 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Poison room locked.
Handling
Wash thoroughly after handling. Wash hands before eating. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Use only in a chemical fume hood. Wash clothing before reuse.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate gloves to prevent skin exposure. Clothing: Wear appropriate clothing to prevent skin exposure.
Respirators
Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation. Do not get water inside containers.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Oxidizing agents.
Decomposition
Oxides of sulfur, arsenic fumes.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Containers may explode when heated. Extinguishing media: Do NOT get water inside containers. Do NOT use straight streams of water. For small fires, use dry chemical, carbon dioxide, or water spray. Cool containers with flooding quantities of water until well after fire is out. For large fires, use water spray, fog or regular foam.
Fire potential
May burn but does not ignite readily.
Hazards
Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.
Combustion products
Poisonous fumes of the compound may be formed in fires.
Health
3
 
Flammability
0
 
 
Reactivity
0
 

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
2
Exposure effects
Arsenic trioxide can cause cancer in humans. Other long term effects include: anemia, liver and kidney damage, Chronic exposure to arsenical dust may cause breath shortness, nausea, chest pains, and garlic odor.
   Ingestion
Harmful if swallowed. Causes gastrointestinal irritation with nausea, vomiting and diarrhea. Ingestion of large amounts may cause CNS depression. Ingestion of arsenical compounds may cause burning of the lips, throat constriction, swallowing difficulties, severe abdominal pain, severe nausea, projectile vomiting, and profuse diarrhea. May cause garlic smell on the breath and body. Ingestion of arsenic compounds can produce convulsions, coma, and possibly death within 24 hours.
   Inhalation
Causes respiratory tract irritation. Exposure produces central nervous system depression. Inhalation of arsenic compounds may lead to irritation of the respiratory tract and leading to possible nasal perforation. Long-term exposure to arsenic compounds may produce impairment of peripheral circulation.
   Skin
Causes skin irritation. Exposure to arsenic compounds may produce hyperpigmentation of the skin and hyperkeratoses of plantar and palmar surfacesas well as both primary irritation and sensitization types.
   Eyes
Causes eye irritation. May cause conjunctivitis.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1557
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
ART
 
Std. Transport #
4923222