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SELENIUM
(powder)
ICSC: 0072
Peer-Review Status: 24.11.2009 Validated
 
CAS #: 7782-49-2 RTECS #: VS7700000
UN #: 2658 ()
EC #: 034-001-00-2
EINECS #: 231-957-4
    Formula: Se
Atomic mass: 79.0

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames. NO contact with oxidants.  Use foam, powder, carbon dioxide. NO water. 
EXPLOSION Risk of fire and explosion on contact with oxidants.     
 
EXPOSURE   STRICT HYGIENE!   
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
PACKAGING & 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.  Airtight.
Do not transport with food and feedstuffs. 
EC Classification
Symbol: T; R: 23/25-33-53; S: (1/2)-20/21-28-45-61 
UN Classification
 
GHS Classification
Signal: 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 
excl mark;warncancer;health hazenviro;aqua

EMERGENCY RESPONSE SAFE 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. 

IMPORTANT DATA
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. 

Occupational exposure limits
TLV: 0.2mg/m³ as TWA; (ACGIH 2009).
MAK (inhalable fraction): 0.05 mg/m³; Carcinogen category: 3B; Peak limitation category: II(4); Pregnancy risk group: C; (DFG 2009). 

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

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

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. 

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


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
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  
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
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


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