Items

Standard

Appearance

White crystalline powder

Identification

Positive

Clarity of solution

Clear

Color of solution

£BY₇

Assay

99.0~100.0%

Loss on Drying

≤0.4%

Residue on  ignition

£0.1%

Sulphate Ash

£0.1%

Specific rotation

+20.5°~ +21.5°

pH(with 2% water solution）

2.4-2.8

PH(with 5% water solution）

2.1-2.6

Melting range

About 190℃

Heavy metals

£3ppm

Iron

£2ppm

Copper

£5ppm

Oxalic acid

£0.2%

Arsenic

£1ppm

Lead

£3ppm

Cadmium

£1ppm

Mercury

£1ppm

Organic volatile impurities

Meets the requirements

Related Substances

ImpurityC≤0.15%

ImpurityD≤0.15%

Any Other  Unspecific Impurities Impurity≤0.10%

Total  Impurity≤0.2%