ITEM	STANDARD
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?

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