Appearance: white or almost white crystalline powder
PH: 1.5- 2.5
Residue on ignition: ≤0.1%
Loss on dry : ≤0.5%
Heavy metals: ≤0.002%
Related substance: Impurity A≤0.2%
The first Isomer of impurity B≤0.3%
Impurity C≤1.0%
Single unknown impurities≤0.1%
Total impurity≤1.5%:
Assay: 97.0% - 101.5% (calculated on dry basis)
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