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Appearance
|
White to yellow powder or crystals
|
|
Assay (iodometric)
|
Min 98%
|
|
Insoluble matter
|
Max 0.005%
|
|
Chloride (Cl)
|
Max 0.005%
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Foreign heavy metals (as Pb)
|
Max 0.002%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Mercury (II) (as Hg)
|
Max 0.5%
|
|
Substance not reducible with formic acid (Residue on ignition as SO4)
|
Max 0.01%
|
|
Substance insoluble in dilute nitric acid
|
Passes test
|