Appearance (Colour)
White
Appearance (Form)
Crystalline powder
Solubility (Turbidity) 10% aq. solution
Clear
Solubility (Colour) 10% aq. solution
Colourless
Assay (Redox Titration)
min. 99.5%
pH (5% aq. solution)
7.0 - 8.5
Chloride (CI)
max. 0.001%
Sulphate (SO4)
max. 0.01%
Iron (Fe)
max. 0.0005%
Heavy Metals (Pb)
max. 0.001%
Copper (Cu)
max. 0.0005%
Nitrogen compounds
max. 0.002%
Sodium (Na)
max. 0.02%
Insoluble matter
max. 0.01%
Ammonium (NH4)
max. 0.002%
Substances darkened by hot Sulfuric acid
Passes test
Neutrality
Passes test