|
Appearance
|
White crystalline powder
|
|
Assay (complexometric; on dried basis)
|
Min 98.5%
|
|
Heavy metal (as Pb)
|
Max 0.002%
|
|
Loss on drying (400 to 500°C)
|
22.0 - 28.0%
|
|
Chloride (Cl)
|
Max 0.04%
|
|
Arsenic (As)
|
Max 0.0005%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Acidity or alkalinity
|
Passes test
|