|
Appearance
|
Light blue or blue-green or green powder or crystals
|
|
Assay
|
98.5 - 104.5%
|
|
pH (5% solution in water)
|
3.0 - 4.0
|
|
Chloride (Cl)
|
Max 0.01%
|
|
Heavy metal (as Pb)
|
Max 0.005%
|
|
Arsenic (As)
|
Max 0.0002%
|
|
Lead (Pb)
|
Max 0.001%
|
|
Iron (III) salts (as Fe)
|
Max 0.2%
|
|
Copper (Cu)
|
Max 0.005%
|
|
Manganese (Mn)
|
Max 0.1%
|
|
Mercury (Hg)
|
Max 0.0003%
|
|
Zinc (Zn)
|
Max 0.05%
|