Test item

Specification

Reagent grade

Pharmaceutical grade

Appearance

Conform

Conform

Assay /%

≥99.0

≥98.0

Clarify degrees test

Conform

Conform

Water insoluble/%

≤0.003

≤0.005

Chloride (Cl)/%

≤0.001

≤0.002

Sulfate (SO4)/%

≤0.002

≤0.01

Ferric (Fe) /%

≤0.0002

≤0.001

Arsenic  (As) /%

≤0.00002

≤0.00005

Lead (Pb)/%

≤0.002

≤0.01

Vulcanization ammonium not sediment /%

≤0.1

≤0.2