Parameter     Product

Index

Unit

Reagent A.C.S

U.S.P.

Technical

Pure Grade

Assay C4H6O4ZnDry Basis

99.0-102.0

98.0-102.0

99.0-102.0

PH of 5% Solution at 25

6.0 7.0

6.0 7.0

6.0 7.0

Insoluble Matter

≤%

0.005

0.005

0.05

Chloride (Cl)

≤%

0.0005

0.005

0.01

Sulfate (SO4)

≤%

0.005

0.01

0.01

Calcium (Ca)

≤%

0.005

Magnesium (Mg)

≤%

0.005

Potassium (K)

≤%

0.01

Iron (Fe)

≤%

0.0005

0.0005

Lead (as Pb)

≤%

0.002

0.002

0.005

Organic Volatile Impurities

Balance

Balance

Arsenic (As)

≤ppm

0.5

3

3