API(active pharmaceutical ingredient)

Ascorbic Acid

Items	Specifications	Result
Characteristics	White or almost white, crystalline powder
Identification	Positive reaction	Positive
Melting Point	About 190℃	190℃
PH	2.1-2.6	2.48
Clarity of solution	Clear	Clear
Color of solution	≤BY₇	＜BY₇
Copper	≤5ppm	＜5ppm
Heavy metals	≤10ppm	＜10ppm
Mercury	＜0.1mg/kg	＜0.1mg/kg
Lead	＜3mg/kg	＜3mg/kg
Arsenic	≤3ppm	＜3ppm
Cadmium(Cd)	＜1mg/kg	＜1mg/kg
Oxalic Acid	≤0.2%	＜0.2%
Iron	≤2ppm	＜2ppm
Loss of drying	≤0.4%	＜0.4%
Sulphate ash (residue on ignition)	≤0.1%	＜0.1%
Specific optical rotation	+20.5°- +21.5°	+20.97°
Mesh	40-80 Mesh	Pass
Assay	99.0%-100.5%	99.90%