Appearance

White crystals or almost white crystallinepowder

Assay

99.0-100.0%

Identofication

Positive

Clarity of solution

Clear

Color of solution

BY7 max.

Copper salt

<5ppm

Heavy metals

<10ppm

Iron

<2ppm

Mesh size

100% pass 80 mesh

Melting point

191 deg C-192deg C

Organic volatile impurities

Complying standard

Oxalic acid

0.2% max

PH

(in 2% solution) 2.2-2.5

Residue on ignition

0.1% max

Specific optical rotation

At 25deg C +20.5deg- 21.5deg