Grade

U.S.P

F.C.C

Technical pure

Assay(on dry basis)%

99.0-100.5

99.0-100.5

98.0-100.5

PH of a 5% solution at 25℃

6.3-9.6

6.3-9.6

6.3-9.6

Arsenic(As)%≦

0.0003

0.0003

Arsenic(As)(H₂O)%≦

1.0

1.0

2.0

Chloride(Cl)%≦

0.05

0.05%

0.1

Fluoride(F)%≦

0.005

0.005

Sulfate(SO₄)%≦

0.06

0.1

0.1

Lead(Pb)%≦

0.001

Heavy metals%≦

0.0025

0.001

0.001

Nitrate(NO₃)

To pass test

Organic volatile impurities

To pass test