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SELENIUM ICSC: 0072
Date of Peer Review: April 1993

(powder)
CAS # 7782-49-2 Se
RTECS # VS7700000 Atomic mass: 79.0
UN #
EC # 034-001-00-2
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire.
NO open flames. NO contact with oxidants.
Powder, AFFF, foam, carbon dioxide. NO water.
EXPLOSION Risk of fire and explosion on contact with oxidants.


EXPOSURE
PREVENT DISPERSION OF DUST! STRICT HYGIENE!

Inhalation Irritation of nose. Cough. Dizziness. Headache. Laboured breathing. Nausea. Sore throat. Vomiting. Weakness. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
Skin Redness. Skin burns. Pain. Discolouration.
Protective gloves. Protective clothing.
Rinse skin with plenty of water or shower. Refer for medical attention. Remove and isolate contaminated clothes.
Eyes Redness. Pain. Blurred vision.
Safety spectacles or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Metallic taste. Diarrhoea. Chills. Fever. (Further see Inhalation).
Do not eat, drink, or smoke during work.
Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Do NOT wash away into sewer. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place. Personal protection: P3 filter respirator for toxic particles.
Airtight. Do not transport with food and feedstuffs.
EU Classification
Symbol: T
R: 23/25-33-53
S: (1/2-)-20/21-28-45-61
UN Classification

EMERGENCY RESPONSE SAFE STORAGE

Fireproof. Separated from strong oxidants, strong acids, food and feedstuffs. Dry.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2004

SEE IMPORTANT INFORMATION ON BACK


SELENIUM ICSC: 0072
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
ODOURLESS SOLID IN VARIOUS FORMS. DARK RED-BROWN TO BLUISH-BLACK AMORPHOUS SOLID OR RED TRANSPARENT CRYSTALS OR METALLIC GREY TO BLACK CRYSTALS.

CHEMICAL DANGERS:
Upon heating, toxic fumes are formed. Reacts violently with oxidants strong acids. Reacts with water at 50C forming flammable/explosive gas (hydrogen - see ICSC0001) and selenious acids. Reacts with incandescence on gentle heating with phosphorous and metals such as nickel, zinc, sodium, potassium, platinum.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 0.2 mg/m as TWA; (ACGIH 2004).
MAK: (Inhalable fraction) 0.05 mg/m; Peak limitation category: II(4); Carcinogen category: 3B; Pregnancy risk group: C; (DFG 2004).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation, through the skin and by ingestion.

INHALATION RISK:
Evaporation at 20C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes and the respiratory tract. Inhalation of dust may cause lung oedema (see Notes). Inhalation of fume may cause symptoms of asphyxiation, chills and fever and bronchitis. The effects may be delayed.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis. The substance may have effects on the respiratory tract, gastrointestinal tract, and skin, resulting in nausea, vomiting, cough, yellowish skin discolouration, loss of nails, garlic breath and bad teeth.
PHYSICAL PROPERTIES
Boiling point: 685C
Melting point: 170-217C
Relative density (water = 1): 4.8
Solubility in water: none
Vapour pressure, Pa at 20C: 0.1
ENVIRONMENTAL DATA

NOTES
Do NOT take working clothes home.
Card has been partly updated in April 2005. See sections Occupational Exposure Limits, EU classification, Emergency Response.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2004
See Also:
        Selenium (EHC 58, 1986)
        Selenium (PIM 483)