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Appearance
|
White crystalline powder
|
|
Assay (acidimetric)
|
Min 99.5%
|
|
pH (5% solution in water; 25°C)
|
4.1 - 4.5
|
|
Insoluble matter in water
|
Max 0.01%
|
|
Chloride (Cl)
|
Max 0.001%
|
|
Sulphate (SO4)
|
Max 0.003%
|
|
Total nitrogen (N)
|
Max 0.001%
|
|
Heavy metals (by ICP-OES)
|
Max 0.001%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Sodium (Na)
|
Max 0.005%
|
|
Loss on drying (at 105°C; 2 hrs)
|
Max 0.2%
|