Characters

White or almost white,crystalline powder or

colourless crystals

ldentification

corresponds

Melting point

189℃~193℃

PH(5%,W)

2.1~2.6

PH(2%,W)

2.4~2.8

specific optical

rotation

+20.5°~+21.5°

Appearance of

solution

Solution s is clear and not more intensely

coloured than reference solution BY7

Heavy metals

10 ppm

Assay

99.0%~100.5%

Copper

5ppm

lron

2ppm

Mercury

1ppm

Arsenic

3ppm

Lead

2ppm

oxalic acid

(impurity E)

0.2%

Loss on drying

0.4%

Sulphated ash

0.1%

lmpurity c

0.15%

lmpurity D

0.15%

Unspecified

impurities

≤0.10%

Total

0.2%

Methanol

3000ppm

TAMC

103 cfu/g

TYMC

102 cfu/g

E.coli

Absence