Names | |
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IUPAC name
Diammonium thiosulfate
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Other names
Ammonium thiosulphate, ATS
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Identifiers | |
3D model (
JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.029.074 |
PubChem
CID
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UNII | |
CompTox Dashboard (
EPA)
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Properties | |
[NH42S2O3 | |
Molar mass | 148.20 g·mol−1 |
Appearance | colorless or white, hygroscopic solid |
Density | 1.679 g/cm3 |
Melting point | decomposes at 100 °C |
173 g/100 mL (20 °C) | |
Solubility | slightly soluble in
acetone insoluble in alcohol |
Structure | |
monoclinic | |
Hazards | |
Lethal dose or concentration (LD, LC): | |
LD50 (
median dose)
|
2980 mg/kg (rat, oral) |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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Ammonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound with the formula [NH42S2O3. It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether. [1]
It is produced by treating ammonium sulfite with sulfur at temperatures between 85 and 110 °C: [2]
Ammonium thiosulfate is used in photographic fixer. It is a so-called rapid fixer, acting more quickly than sodium thiosulfate fixers. [3] Fixation involves these chemical reactions (illustrated for silver bromide): [4]
Ammonium thiosulfate is also used for leaching of gold and silver. It works with presence of copper as a catalyst here. This process is a nontoxic alternative gold cyanidation. [5] The advantage to ammonium thiosulfate is that the pyrolysis of its silver complexes leaves a residue solely of silver sulfide, in contrast to complexes derived from sodium thiosulfate. [2]
Ammonium thiosulfate can be used as a fertilizer. [6] As suggested by some research studies, it can also be used as an additive to coal- waste mixtures to reduce formation of dioxins and furans during combustion. [7]
LD50 (oral, rat) is 2890 mg/kg. [2]
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