Colourless or White Crystals

Name of index

GB6782-2009

BP2009

FCC-4

USP32

Appearance

White or light yellow crystal or powder

White or light yellow crystal or powder

White or light yellow crystal or powder

White or light yellow crystal or powder

Content(KC6H5O7)≥%

99.0-100.5

99.0-101.0

99.0-100.5

99.0-100.5

Light transmittance≥%

95.0

pass test

-

-

Heavy metal(As Pb) %

-

0.001

-

0.001

Pb≤%

0.0002

-

0.0002

-

As ≤%

0.0001

-

-

-

Loss on drying%

10.0-13.0

11.0-13.0

10.0-13.0

10.0-13.0

CI ≤%

0.005

0.005

-

-

Sulphate Salt ≤%

0.01

0.015

-

Qxalate salt ≤%

0.01

0.03

-

Alkalinity

pass test

pass test

pass test

pass test

Readily Carbonisable Substances

1.0

pass test

-

Fe ≤%

0.0005

-

-

-

Calcium Salt ≤%

0.02

-

-

-

Water insoluble

pass test

-

-

-

Pyrogers

-

pass test

-

-