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SELENIUMICSC: 0072
November 2009
CAS #: 7782-49-2
UN #: 3283 (n.o.s.)
EINECS #: 231-957-4

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.  Risk of fire and explosion on contact with oxidants.  NO open flames. NO contact with oxidizing agents.    Use foam, powder, carbon dioxide. NO water.   

 STRICT HYGIENE!  
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Sore throat. Cough. Nasal discharge. Loss of smell. Headache.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness.  Protective gloves.  Rinse and then wash skin with water and soap. 
Eyes Redness.  Wear safety spectacles or eye protection in combination with breathing protection.  Rinse with plenty of water (remove contact lenses if easily possible). 
Ingestion Garlic breath. Diarrhoea.  Do not eat, drink, or smoke during work.  Rinse mouth. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

excl mark;warncancer;health hazenviro;aqua
WARNING
May cause respiratory irritation
May cause damage to the nervous system and gastrointestinal tract
May cause damage to nervous system and gastrointestinal tract through prolonged or repeated exposure
Very toxic to aquatic life 

Transportation
UN Classification
 

STORAGE
Separated from strong oxidants, strong acids and food and feedstuffs. Dry. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing. 
PACKAGING
Airtight.
Do not transport with food and feedstuffs. 
SELENIUM ICSC: 0072
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
GREY SOLID IN VARIOUS FORMS. 

Physical dangers
No data. 

Chemical dangers
Upon heating, toxic fumes are formed. Reacts with oxidants and strong acids. Reacts , if in amorphous form, with water at 50°C. This produces flammable/explosive gas (hydrogen - see ICSC 0001) and selenious acids. 

Formula: Se
Atomic mass: 79.0
Boiling point: 685°C
Melting point: 217°C
Relative density (water = 1): 4.8
Solubility in water: none
Vapour pressure, Pa at 20°C: 0.1  


EXPOSURE & HEALTH EFFECTS

Routes of exposure
The substance can be absorbed into the body by inhalation and by ingestion. 

Effects of short-term exposure
The substance is irritating to the respiratory tract. The substance may cause effects on the gastrointestinal tract and nervous system. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly on spraying or when dispersed, especially if powdered. 

Effects of long-term or repeated exposure
The substance may have effects on the respiratory tract, gastrointestinal tract and skin. 


Occupational exposure limits
TLV: 0.2 mg/m3, ppm, as TWA.
MAK: (inhalable fraction): 0.02 mg/m3; peak limitation category: II(8); skin absorption (H); carcinogen category: 3B; pregnancy risk group: C 

ENVIRONMENT
The substance is very toxic to aquatic organisms. It is strongly advised not to let the chemical enter into the environment. 

NOTES
Do NOT take working clothes home. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: T; R: 23/25-33-53; S: (1/2)-20/21-28-45-61 

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    See Also:
       Toxicological Abbreviations
       Selenium (EHC 58, 1986)
       Selenium (PIM 483)