Ascorbic Acid

BP/USP/EP/JP/CP

		ITEM		SPECIFICATION				RESULT
1.		Characteristics		White or almost white crystals or crystalline powder				White crystalline powder
2.		Identification		Positive reaction				Positive
3.		Melting point		About 190℃				191℃
4.		PH		2.1 to 2.6				2.42
5.		Clarity of solution		Clear				Clear
6.		Color of solution		Not more than BY7				Less than BY7
7.		Copper		Not more than 5ppm				Less than 5ppm
8.		Heavy metals		Not more than 10ppm				Less than 5ppm
9.		Mercury		Less than 0.1mg/kg				Conform
10.		Lead		Less than 3mg/kg				Conform
11.		Arsenic		Not more than 3ppm				Less than 3ppm
12.		Cadmium(Cd)		Less than 1mg/kg				Conform
13.		Oxalic acid		Not more than 0.2%				Less than 0.2%
14.		Iron		Not more than 2ppm				Less than 2ppm
15.		Loss on drying		Not more than 0.4%				Less than 0.1%
16.		Residue on ignition		Not more than 0.1%				Less than 0.1%
17.		Mesh		40-80mesh				Pass
18.		Specific rotation		+20.5°-+21.5°				+21.11°
19.		Organic volatile impurities		Pass				Pass
20.		Free of metal perticles		Containing or not containing				Not containing
21.		Assay		99.0%--100.5%				99.91%