Arsenic(III) selenide

  • Dirsenic triselenide
  • Arsenic sesquiselenide
Formula
As2Se3
Structure
Description
brown-black, odorless solid

Registry Numbers and Inventories.
CAS
1303-36-2
EC (EINECS/ELINCS)
215-119-5
RTECS
CG2285000
RTECS class
Other
UN (DOT)
1557
Merck
12,845
Beilstein/Gmelin
35183 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
As2Se3
Formula mass
386.72
Melting point, °C
382.35 - 383.35
Density
4.49 g/cm3
Solubility in water
Insoluble.
Thermal expansion
0.000027/K

Hazards and Protection.
Storage
Store in cool, dry place. Store in a tightly sealed container
Handling
Implement engineering and work practice controls to reduce and maintain concentration of exposure at low levels. Use good housekeeping and sanitation practices. Do not use tobacco or food in work area. Wash thoroughly before eating and smoking. Do not blow dust off clothing with compressed air.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
Stable at normal temperatures and pressures.
Decomposition
Fumes of arsenic and selenium.

Fire.
Fire fighting
Small Fires: Dry chemical, carbon dioxide or water spray. Large Fires: Water spray, fog or regular foam.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
Containers may explode when heated.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
4
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
10 µg/m3 PEL
Carcinogin
O, G-A1, I-1, N-1, CP65
Exposure effects
   Ingestion
DANGER-POISON. May cause systemic gastrointestinal and skin effects and acute arsenic poisoning. May cause chronic arsenic poisoning, gastrointestinal disturbances, liver damage and cancer/disease of the blood, kidneys and nervous system. May cause garlic odor to breath, pallor, nervousness, depression, headache, chills, fever, dyspnea, metal taste, laryngitis, bronchitis, and huskiness of the voice.
   Inhalation
DANGER-POISON. May cause irritation to the respiratory system, garlic odor of the breath, pallor, nervousness and depression. DANGER-POISON. May cause bronchitis, chronic arsenic poisoning, ulceration of the nasal septum, liver damage and cancer/disease of the blood, kidneys and nervous system.
   Skin
May cause irritation and skin abnormalities. May cause irritation, occasional ulceration, spotty pigmentation, dermatitis, skin cancer and keratoses (especially on soles and palms).
   Eyes
May cause irritation. May cause disturbances, such as blurred vision.

First aid
 
   Ingestion
If conscious, give 1-2 glasses of milk or water and induce vomiting, call a physician immediately. Never give anything by mouth to an unconscious person.
   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
1557
Response guide
Hazard class
6.1
Packing Group
I; II; III