Item

Industry grade

Food grade

Identification

in accordance with standard

in accordance with standard

Assay ,%

≥98.0

98.0 -102.0

Loss on dry ,%

≤0.50

≤0.30

Reduzate ,%

≤0.70

≤0.50

PH

6.2 7.8

6.2 7.8

Sulfate ,%

≤0.05

≤0.05

Chloride ,%

≤0.07

≤0.07

Pb ,μ g/g

≤2

≤1

Arsenic salt ,μ g/g

≤2

≤2

Heavy metals ,μ g/g

≤10

≤10

Appearance of solution (1.0g,10ml water)

colorless, almost clear