ICSC 1461 - SODIUM DISULFITE

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SODIUM DISULFITE

ICSC: 1461
_{October 2002}

Disodium disulfite
Disodium pyrosulfite
Sodium metabisulfite

CAS No: 7681-57-4
RTECS No: UX8225000
EC No: 016-063-00-2

Na₂O₅S₂
Molecular mass: 190.1

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	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.	Xn Symbol R: 22-31-41 S: (2-)26-39-46

EMERGENCY RESPONSE	STORAGE
	Separated from acids, and strong oxidants.

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/m³ 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 20°C 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	ENVIRONMENTAL DATA
Decomposes below melting point at 150°C Density: 1.4 g/cm³ Solubility in water, g/100 ml: 54 (good) Octanol/water partition coefficient as log Pow: -3.7	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.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2002

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Updated by AS. Approved by EC. Last update: 21.03.2003