|
Appearance
|
White powder
|
|
Assay (acidimetric)
|
99.5 - 100.5%
|
|
Appearance of solution
|
Passes test
|
|
Substance insoluble in alcohol
|
Passes test
|
|
pH (3.3% solution in water)
|
3.8 - 4.8
|
|
Sulphate (SO4)
|
Max 0.04%
|
|
Heavy metal (as Pb)
|
Max 0.0015%
|
|
Arsenic (As)
|
Max 0.001%
|
|
Organic impurities
|
Passes test
|
|
Loss on drying (5 hrs.over silica gel)
|
Max 0.5%
|