| Agent Name |
Sodium thiosulfate |
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| CAS Number |
7772-98-7 |
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| Formula |
H2-O3-S2.2Na |
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| Major Category |
Other Classes |
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| Synonyms |
Hypo; Chlorine Control; Chlorine Cure; Declor-It; Disodium thiosulfate; Hypo (VAN); S-Hydril; Sodium hyposulfite; Sodium oxide sulfide (Na2S2O3); Sodium thiosulfate (Na2S2O3); Sodium thiosulfate anhydrous; Sodium thiosulphate (Na2S2O3); Sodothiol; Thiosulfuric acid (H2S2O3), disodium salt; Thiosulfuric acid, disodium salt; "Do not confuse synonym sodium hyposulfite with sodium hyposulfite, synonym for di-Na salt of dithionous acid." [ChemIDplus] |
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| Category |
Sulfur Compounds |
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| Description |
Anhydrous form is a hygroscopic, white solid; [CHEMINFO] |
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| Sources/Uses |
It is added in small quantities to ammonium thiosulfate, which is used as a photographic fixing salt. "The hydrated salt is used as an anti-chlorine in bleaching, in wastewater purification, for reduction of dichromate in chromed leather production, and as a solvent for silver chloride in the chloride roasting of silver-containing minerals." [Ullmann] Used in paper bleaching, photography (fixer), silver extraction, dyeing textiles (mordant), and leather manufacturing; Also used as an antidote for cyanide poisoning and in vet medicine for bloat and ringworm; [Merck Index] |
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| Comments |
Potential combustible dust hazard; Decomposes slowly in water with potential generation of toxic and flammable hydrogen sulfide and corrosive hydrogen sulfite and sulfuric acid; Very soluble in water; Extremely low vapor pressure; May violently decomposes at 223 deg C; [CHEMINFO] May be used in food up to 0.1%; |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: SODIUM THIOSULFATE
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