Agent Name

Sulfurous acid

CAS Number

7782-99-2

Formula

H2-O3-S

Major Category

Toxic Gases & Vapors

Synonyms

Sulphurous acid; Schweflige saure [German]; Sulfur dioxide solution; [ChemIDplus] UN1833

Category

Acids, Inorganic

Description

Clear colorless liquid with a suffocating odor of sulfur dioxide; [Merck Index]

Sources/Uses

Used as a dental bleach, reducing agent, and antiseptic; [Merck Index] Permitted for use as an inert ingredient in non-food pesticide products; [EPA]

Comments

Aqueous solution of approximately 6% sulfur dioxide; Gradually oxidized by air forming sulfuric acid; Corrosive; [Merck Index] A strong oxidizing agent; Causes burns; [CAMEO] Human ingestion of 0.5 mg/kg causes diarrhea, other gastrointestinal changes, and nausea or vomiting; [RTECS] Causes burns; Harmful by inhalation; [Alfa Aesar MSDS] See "Sulfur dioxide" and "Sulfuric acid."

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: