Appearance
|
White crystalline powder
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Assay (iodometric)
|
Min 99%
|
Foreign heavy metals, soluble mercury salts (as Pb)
|
Max 0.002%
|
Ammonium (NH4)
|
Max 0.01%
|
Substance not reducible with formic acid (Residue on ignition as SO4)
|
Max 0.1%
|
Loss on drying
|
Max 0.5%
|
Impurities with an acidic or alkaline reaction
|
Passes test
|