|
Appearance
|
White crystalline powder
|
|
Assay (alkalimetric)
|
99.0-101.0%
|
|
pH (5% solution in water; 25°C)
|
4.1 to 4.7
|
|
Insoluble matter in water
|
Max 0.05%
|
|
Nitrogen compounds (as N)
|
Max 0.002%
|
|
Chloride (Cl)
|
Max 0.002%
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Arsenic (As)
|
Max 0.0001%
|
|
Calcium (Ca)
|
Max 0.01%
|
|
Copper (Cu)
|
Max 0.001%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Magnesium (Mg)
|
Max 0.01%
|
|
Nickel (Ni)
|
Max 0.001%
|
|
Lead (Pb)
|
Max 0.002%
|