|
Appearance
|
White crystalline powder
|
|
Assay (on anhydrous basis)
|
98 - 100%
|
|
pH (10% solution in water)
|
7.0 - 9.0
|
|
Fluorine
|
Max 0.001%
|
|
Arsenic (As)
|
Max 0.0003%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Insoluble matter in water
|
Max 0.3%
|
|
Iron (Fe)
|
Max 0.005%
|
|
Lead (Pb)
|
Max 0.0005%
|
|
Magnesium (Mg)
|
To pass the test
|
|
Moisture content
|
Max 4%
|