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

Water(H₂O)%≦

7.0

7.0

8.0

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