Item

AR

CP

Special Grade

Assay[(NH4)2SO4]/%≥

99.0

99.0

99.0

pH Value(50g/L solution, 25oC)

4.8-6.0

4.8-6.0

4.8-6.0

Clarity Test

Qualified

Qualified

Qualified

Water Insolubles/%≤

0.002

0.01

0.01

Residue on Ignition(Sulphates)/%≤

0.01

0.05

0.01

Chlorides(Cl)/%≤

0.0005

0.001

Nitrate(NO3)/%≤

0.001

0.005

Phosphate(PO4)/%≤

0.0005

0.002

As/%≤

0.00002

0.0002

0.0002

Fe/%≤

0.0002

0.0005

0.0002

Ca/%≤

0.005

Heavy Metal(Pb)/%≤

0.0005

0.002

0.002