|
Appearance
|
White crystalline powder
|
|
Assay (as NH4Cl; on anhydrous basis)
|
Min 99.5%
|
|
pH (5% solution in water; 25°C)
|
4.5 - 5.5
|
|
Insoluble matter (10% in water)
|
Max 0.005%
|
|
Residue on ignition
|
Max 0.01%
|
|
Calcium (Ca)
|
Max 0.001%
|
|
Magnesium (Mg)
|
Max 0.0005 %
|
|
Heavy metals (by ICP-OES)
|
Max 0.0005%
|
|
Iron (Fe)
|
Max 0.0002%
|
|
Phosphate (PO4)
|
Max 0.0002%
|
|
Sulphate (SO4)
|
Max 0.001%
|
|
Sodium (Na)
|
Max 0.005%
|
|
Potassium (K)
|
Max 0.005%
|
|
Copper (Cu)
|
Max 0.0002%
|
|
Lead (Pb)
|
Max 0.0002%
|