CAS number : 7783-18-8
Molecular weight :148.21
Molecular formula/chemical symbol :(NH4)2S2O3
Description :
Apearances: White monoclinic system crystals. Easy to moisture. Easily soluble in water, 100 ℃ when to solubility 103.3g/100ml water. 60% aqueous solution of pH 6.5 to 7.0. Insoluble in alcohol, ether, slightly soluble in acetone. Heated to 150 ° C and is formed by decomposition of ammonium sulfite, sulfur, ammonia, hydrogen sulfide and water. The air is very unstable and stable in ammonia.
USES :
The photographic industry is used as a
photographic fixing agent, compared with the sodium salt more soluble silver
halide milk film, having a washing time is short and the silver recovery and
easy, but also as the main component of the silver plating bath, detergents of
the metal surface, aluminum, magnesium and casting the protective agent. As a
fungicide in the pharmaceutical, analytical reagent.
Report :
|
TEST ITEMS |
TEST RESULT |
|
|
(CP) |
|
|
50-60% |
|
Ammonium sulfite |
≤1.0% |
|
Alkalinity |
≤0.4% |
|
Heavy metal |
≤0.002% |
|
Fe |
≤0.001% |
|
Sulfide |
≤0.0002% |
|
Residue on ignition |
≤0.2% |
