|
Appearance
|
Gray powder
|
|
Assay
|
Min 99%
|
|
Substance insoluble in HCl
|
Max 0.1%
|
|
Substance soluble in water
|
Max 0.1%
|
|
Substance with alkaline reaction
|
Passes test
|
|
Chloride (Cl)
|
Max 0.002%
|
|
Phosphorus (as PO4)
|
Passes test
|
|
Sulphide (S)
|
Passes test
|
|
Heavy metal (as Pb)
|
Max 0.02%
|
|
Ammonium (NH4)
|
Passes test
|
|
Aluminium and zinc (Al, Zn)
|
Passes test
|
|
Arsenic (As)
|
Max 0.0005%
|
|
Chromium (Cr)
|
Passes test
|