Agent Name

Ammonium thiosulfate

CAS Number

7783-18-8

Formula

O3-S2.2H4-N

Major Category

Nitrogen Compounds

Synonyms

Ammo hypo; Ammonium hyposulfite; Ammonium thiosulfate ((NH4)2S2O3); Diammonium thiosulfate; Thio-Sul; Thiosulfuric acid (H2S2O3), diammonium salt; Thiosulfuric acid, diammonium salt; [ChemIDplus]

Category

Ammonium Compounds

Description

Colorless or white solid with an odor of ammonia; Hygroscopic; [HSDB] White crystalline powder; [MSDSonline]

Sources/Uses

Used to clean "white" metal and zinc-base die-cast metals and as a reducing agent and brightener in silver plating baths; Also used in photography, lubricants (for metal cold-working), fungicides, hair-waving preparations, fog screens, and in desiccants and defoliants (crop-bearing plants such as cotton, soybean, alfalfa, rice, and peppers); [HSDB]

Comments

A skin, eye, and respiratory tract irritant; Emergency treatment: "Sodium thiosulfate"; Ingestion of 12 grams of sodium thiosulfate is nontoxic except for violent laxative effect; [HSDB] Lethal dose effects include convulsions and acute tubular necrosis; [RTECS] An irritant; [MSDSonline] See "Sodium thiosulfate."

Reference Link

EPA Pesticide Chemical Search

Exposure Assessment
Lethal Concentration

LC (rat) > 2,260 mg/m3/4h

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: