Item

standard

characteristics

White or almost white crystalline powder

Identification

Positive reaction

Assay of Ascorbic Acid

99.0% ~101.0%

PH

2.2-2.5

copper

≤0.0005%

Colour of solution

≤0.03

Clarity of solution

≤BY

Oxalic acid

≤0.2%

Heavy metals (as Lead)

≤0.001%

iron

≤0.0002%

Residue on Ignition

≤ 0.1%

Bacterial toxin

＜0.02EU/mg

Melting point

190-192℃

Specific rotation

+20.5-+21.5°

MESH SIZE DISTRIBUTION

> 20 mesh < 5%;> 40 mesh 20%;> 60 mesh 60% ;> 80 mesh 10%; >100 mesh 5%