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SODIUM SELENITEICSC: 0698
November 1998
CAS #: 10102-18-8Disodium selenite
Selenious acid, disodium salt
Disodium selenium trioxide
UN #: 2630
EINECS #: 233-267-9

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Combustible under specific conditions. Gives off irritating or toxic fumes (or gases) in a fire.    NO open flames.    Use water spray, foam, carbon dioxide, dry sand, special powder.   

 PREVENT DISPERSION OF DUST! STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR! 
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Abdominal cramps. Cough. Diarrhoea. Dizziness. Headache. Laboured breathing. Nausea. Sore throat. Vomiting.  Use local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. 
Skin Redness. Pain.  Protective gloves.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain.  Wear safety spectacles, face shield or eye protection in combination with breathing protection if powder.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal cramps. Vomiting.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). 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 sealable 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

 

Transportation
UN Classification
UN Hazard Class: 6.1; UN Pack Group: I 

STORAGE
Separated from strong acids and food and feedstuffs. Well closed. Store in an area without drain or sewer access. 
PACKAGING
Do not transport with food and feedstuffs. 
SODIUM SELENITE ICSC: 0698
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
HYGROSCOPIC SOLID IN VARIOUS FORMS. 

Physical dangers
 

Chemical dangers
Decomposes on contact with hot surfaces or flames. This produces toxic gases. The solution in water is a weak base. Reacts with strong acids. This generates toxic hazard. 

Formula: Na2SeO3
Molecular mass: 172.9
Decomposes at 320°C
Solubility in water, g/100ml at 20°C: 85  


EXPOSURE & HEALTH EFFECTS

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

Effects of short-term exposure
The substance is irritating to the eyes, skin and respiratory tract. The substance may cause effects on the liver, heart, nervous system and gastrointestinal tract. Medical observation is indicated. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. The substance may have effects on the central nervous system, bone and blood. See Notes. 


Occupational exposure limits
TLV: 0.2 mg/m3, ppm, as TWA.
MAK: (as Se, 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 toxic to aquatic organisms. Bioaccumulation of this chemical may occur along the food chain, for example in plants and fish. It is strongly advised not to let the chemical enter into the environment. 

NOTES
Do NOT take working clothes home.
Also consult ICSC 0072 (Selenium). 

ADDITIONAL INFORMATION
  EC Classification
Symbol: T+, N; R: 23-28-31-43-51/53; S: (1/2)-28-36/37-45-61 

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    See Also:
       Toxicological Abbreviations