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SODIUM DISULFITE ICSC: 1461
Date of Peer Review: October 2002

Disodium disulfite
Disodium pyrosulfite
Sodium metabisulfite
CAS # 7681-57-4 Na2O5S2
RTECS # UX8225000 Molecular mass: 190.1
UN #
EC # 016-063-00-2
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Not combustible.

In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION


EXPOSURE
PREVENT DISPERSION OF DUST!

Inhalation Cough. Wheezing.
Local exhaust or breathing protection.
Fresh air, rest.
Skin
Protective gloves.
First rinse with plenty of water, then remove contaminated clothes and rinse again.
Eyes Redness. Pain.
Safety goggles.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion Abdominal pain. Diarrhoea. Nausea. Vomiting.
Do not eat, drink, or smoke during work.
Rinse mouth. Give plenty of water to drink. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Do NOT absorb in saw-dust or other combustible absorbents. Sweep spilled substance into containers; if appropriate, moisten first to prevent dusting. (Extra personal protection: P2 filter respirator for harmful particles.) Do NOT let this chemical enter the environment.
EU Classification
Symbol: Xn
R: 22-31-41
S: (2-)-26-39-46
UN Classification

EMERGENCY RESPONSE STORAGE

Separated from acids, and strong oxidants.
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 1999

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SODIUM DISULFITE ICSC: 1461
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
WHITE POWDER

CHEMICAL DANGERS:
The substance decomposes on heating producing sulfur oxides. The substance is a strong reducing agent and reacts with oxidants. Reacts violently with concentrated solution of sodium nitrite. The substance decomposes on contact with acids producing sulfur oxides.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 5 mg/m as TWA; A4; (ACGIH 2002).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation 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, the respiratory tract and is severely irritating to gastrointestinal tract. Inhalation of the substance may cause asthma-like reactions.

PHYSICAL PROPERTIES
Decomposes below melting point at 150C
Density: 1.4 g/cm^3
Solubility in water, g/100 ml: 54 (good)
Octanol/water partition coefficient as log Pow: -3.7
ENVIRONMENTAL DATA
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


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 1999