Agent Name

Sodium sulfite

CAS Number

7757-83-7

Formula

H2-O3-S.2Na

Major Category

Other Classes

Synonyms

Anhydrous sodium sulfite; Disodium sulfite; Disodium sulfite (Na2SO3); Exsiccated sodium sulfite; Natrii sulphis; Natrium sulfurosum; Natriumsulfid [German]; Natriumsulfit [German]; S-WAT; Sodium sulfite; Sodium sulfite (Na2SO3); Sodium sulfite anhydrous; Sodium sulfite, exsiccated; Sodium sulphite; Sulftech; Sulfurous acid, disodium salt; Sulfurous acid, sodium salt (1:2); [ChemIDplus]

Category

Sulfites

Description

White odorless powder; [CAMEO]

Sources/Uses

Used in developing photographs, bleaching textiles, manufacturing dyes, silvering glass, and preserving meat; Also used as an antiseptic, disinfectant, and water treatment chemical for industrial boilers and oil wells; [HSDB] Used in photography (preservative); [www.ci.tucson.az.us/arthazards/medium.html]

Comments

A case of occupational asthma, confirmed by specific inhalation challenge, was reported in a worker whose job was to sprinkle dry metabisulfite on potatoes. [Malo JL, Cartier A, Desjardins A. Occupational asthma caused by dry metabisulphite. Thorax 1995 May;50(5); 585-6.] Similar cases have been reported in the wine, laundry, and lobster fishing industries. [Madsen J, Sherson D, Kjoller H, Hansen I, Rasmussen K. Occupational asthma caused by sodium disulphite in Norwegian lobster fishing. Occup Environ Med 2004;61:873-874] Sulfites are not classifiable as to carcinogenicity to humans. [IARC] See "SULFITES."

Reference Link

Occupational asthma caused by dry metabisulphite

Exposure Assessment
Lethal Concentration

LC50 (rat) > 5,500 mg/m3/4h

Reference Link

Sulfite contact allergy.

Adverse Effects
Asthma

Yes

IARC Carcinogen

Not Classifiable

Links to Other NLM Databases
Health Studies

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Toxicity Information

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Chemical Information

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: