Specifications

Appearance (Colour)	White
Appearance (Form)	Crystalline compound
Solubility (Turbidity) 10% aq. solution	Clear
Solubility (Colour) 10% aq. solution	Colourless
Assay	min. 99.5%
pH (5% aq. solution)	6.0-8.5
Loss on drying	max. 1%
Chloride (CI)	max. 0.01%
Iron (Fe)	max. 0.0005%
Heavy Metals (Pb)	max. 0.0005%
Sulphate & sulphite (SO4)	max. 0.03%
Sulphide (S)	max. 0.0001%
Copper (Cu)	max. 0.0005%
Potassium (K)	max. 0.001%
Nitrogen Compounds (N)	max. 0.002%

Application

Sodium thiosulphate and ammonium sulfate in gold extraction

Treatment of cyanide poisoning

It is used to dechlorinate tap water including lowering chlorine levels for use in aquariums, swimming pools, and spa

In water treatment plants to treat settled backwash water prior to release into rivers

To neutralize the color-removing effects of bleach Sodium thiosulphate is used

Used in photographic processing

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