|
Appearance
|
Black coloured fine powder
|
|
Assay (complexometric)
|
Min 99%
|
|
Substance insoluble in dilute HCl
|
Max 0.02%
|
|
Chloride (Cl)
|
Max 0.005%
|
|
Total sulphur (as SO4)
|
Max 0.01%
|
|
Total nitrogen (N)
|
Max 0.002%
|
|
Iron (Fe)
|
Max 0.05%
|
|
Carbon (C)
|
Max 0.01%
|
|
Calcium (Ca)
|
Max 0.01%
|
|
Potassium (K)
|
Max 0.02%
|
|
Sodium (Na)
|
Max 0.05%
|