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SODIUM DISULFITEICSC: 1461
November 2002
CAS #: 7681-57-4Disodium disulfite
Disodium pyrosulfite
Sodium metabisulfite
EINECS #: 231-673-0

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible.        In case of fire in the surroundings, use appropriate extinguishing media.   

 PREVENT DISPERSION OF DUST!  
  SYMPTOMS ACUTE HAZARDS FIRST AID
Inhalation Cough. Wheezing.  Use local exhaust or breathing protection.  Fresh air, rest. 
Skin   Protective gloves.  First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. 
Eyes Redness. Pain.  Wear safety goggles.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Diarrhoea. Nausea. Vomiting.  Do not eat, drink, or smoke during work.  Rinse mouth. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Do NOT absorb in saw-dust or other combustible absorbents. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Personal protection: P2 filter respirator for harmful particles. Do NOT let this chemical enter the environment. 

According to UN GHS Criteria

 

Transportation
UN Classification
 

STORAGE
Separated from acids and strong oxidants. 
PACKAGING
 
SODIUM DISULFITE ICSC: 1461
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE POWDER. 

Physical dangers
 

Chemical dangers
Decomposes on heating. This produces sulfur oxides. The substance is a strong reducing agent. It reacts violently with oxidants. Reacts violently with concentrated solution of sodium nitrite. Decomposes on contact with acids. This produces sulfur oxides. 

Formula: Na2O5S2
Molecular mass: 190.1
Decomposes at 150°C
Density: 1.4 g/cm³
Solubility in water, g/100ml at ml°C: 54 (good)
Octanol/water partition coefficient as log Pow: -3.7  


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 severely irritating to the gastrointestinal tract. The substance is irritating to the eyes and respiratory tract. Inhalation may cause asthma-like reactions. 

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

Effects of long-term or repeated exposure
 


Occupational exposure limits
TLV: 5 mg/m3, ppm, as TWA; A4 (not classifiable as a human carcinogen) 

ENVIRONMENT
The substance is harmful to aquatic organisms. 

NOTES
Rinse contaminated clothes (fire hazard) with plenty of water.
Anyone who has shown symptoms of asthma due to this substance should avoid all further contact.
The symptoms of asthma often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation are therefore essential. 

ADDITIONAL INFORMATION
  EC Classification
Symbol: Xn; R: 22-31-41; S: (2)-26-39-46 

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    See Also:
       Toxicological Abbreviations