|
Appearance
|
A white crystalline powder
|
|
Assay (acidimetric)
|
99 - 103%
|
|
pH (5% solution in water)
|
9.2 - 9.5
|
|
Carbonate, bicarbonate
|
Passes test
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Heavy metal (as Pb)
|
Max 0.002%
|
|
Ammonium (NH4)
|
Max 0.001%
|
|
Arsenic (As)
|
Max 0.0005%
|
|
Calcium (Ca)
|
Max 0.01%
|