Item

Photo Grade-I

Photo Grade-II

Technical Grade

 Main content (dry basis)

≥99.5%

≥99.5%

≥99.0%

Water

≤0.3%

≤0.3%

≤0.5%

Chloride

≤0.2%

≤0.2%

≤0.5%

Bromate

≤0.001%

≤0.003%

≤0.005%

Iodide

≤0.001%

≤0.005%

≤0.005%

Sulfate

≤0.005%

≤0.005%

≤0.01%

PH（5%）

6.0—7.5

5.5—7.5

5.5—7.5

lead

≤0.2ppm

≤4ppm

-

Iron

≤0.5ppm

≤4ppm

-

Copper

≤0.5ppm

≤1.0ppm

-

Bismuth

≤0.2ppm

≤0.5ppm

—

Clarity test

Qualified

Qualified

—

NH4

≤15.0ppm

—

—

Package

Lined with plastic bags or cardboard drum, 25kg / bag, barrel