Characters

White granular crystals or a white crystalline powder

White granular crystals or a white crystalline powder

Assay (Anhydrous basis)

99.0%-101.0%

99.92%

Alkalinity

 LESS THAN 0.2

0.1

Chloride

LESS THAN50 ppm

<50 ppm

Sulphate 

LESS THAN150 ppm

<150 ppm

Readily carbonisable substances

Meets E332

Meets E332

Oxalat

LESS THAN300 ppm

<300 ppm

Heavy metals

LESS THAN10 ppm

<10 ppm

Loss on drying

3.0%-6.0%

4.0%

Sodium

LESS THAN0.3%

<0.3%

Arsenic (As)

LESS THAN1ppm

<1ppm

Lead

LESS THAN1ppm

<1ppm

mercury

LESS THAN1ppm

1ppm