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Appearance White or almost white crystal or crystalline powder Identification Positive Melting point 191 ℃ ~ 192℃ pH (5%, w/v) 2.2 ~ 2.5 pH (2%,w/v) 2.4 ~ 2.8 Specific optical rotation +20.5° ~ +21.5° Clarity of solution Clear Heavy metals =<0.0003% Assay (as C 6H 8O6, %) 99.0 ~ 100.5 Copper =<3 mg/kg Iron =<2 mg/kg Mercury =<1 mg/kg Arsenic =<2 mg/kg Lead =<2 mg/kg Oxalic acid =<0.2% Loss on drying =<0.1% Sulphated ash =< 0.1% Residual solvents (as methanol) =< 500 mg/kg Total plate count (cfu/g) =< 1000 Yeasts & molds (cfu/g) =< 100 Escherichia. Coli/g Absence Salmonella/ 25g Absence Staphylococcus aureus/ 25g Absence