|
Appearance
|
White crystalline powder
|
|
Assay
|
Min 99.9%
|
|
Substnace precipitated by NH4OH
|
Max 0.01%
|
|
Arsenic (As)
|
Max 0.0001%
|
|
Chloride (Cl)
|
Max 0.001%
|
|
Heavy metal (as Pb)
|
Max 0.0005%
|
|
Insoluble matter (10% in water)
|
Max 0.01%
|
|
Iron (Fe)
|
Max 0.0005%
|
|
Loss on drying (at 150°C)
|
13 - 15%
|
|
Nitrogen compounds (as N)
|
Max 0.001%
|
|
Phosphate (PO4)
|
Max 0.0005%
|
|
Potassium (K)
|
Max 0.005%
|
|
Silica (SiO2)
|
Max 0.005%
|
|
Sulphur compounds (as SO4)
|
Max 0.004%
|
|
Calcium (Ca)
|
Max 0.03%
|
|
Magnesium (Mg)
|
Max 0.005%
|