Item	Standard
Appearance	White crystalline powder
Identification	Positive
Clarity of solution	Clear
Assay (%)	99.0~100.5
Loss on drying (%)	≤ 0.40
Residue on ignition (%)	≤ 0.10
Sulphate ash	≤ 0.10
Specific rotation	from +20.5 to +21.5
PH value (2% solution)	2.4 ~ 2.8
PH value (5% solution)	2.1 ~ 2.6
Heavy metals	≤3 ppm
Iron	≤2 ppm
Copper	≤2 ppm
Total plate count	≤1000 cfu/g
Arsenic	≤1 ppm
Mercury	≤1 ppm
Organic volatile impurities	Meets the requirements
Chloride (Cl) (%)	≤ 0.30
Melting point ( ℃)	about 190
Cadmium	≤1 ppm
Lead	≤2 ppm
Storage	in the shade
Packing	Bulk

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