Chemical Analysis of sodium metabisulfite

Component

Industrial Grade

Food Grade

Dying Grade

High Purity Grade

Appearance

White or yellowish crystalline powder

Content (Na2S2O5）

96.5%min

97.0%min

96.5%min

98%min

Water soluble matter

0.05%max

0.03%max

0.05%max

0.02%max

Iron content (Fe)

0.005%max

0.003%max

0.005%max

0.002%max

Arsenic (As)

0.0001%max

0.0001%max

0.0001%max

0.0001%max

Pb

0.0005%max

0.0002%max

-

0.0003%max

TEST ITEMS

magnesium sulfate

MgSO4 · 7H2O

MgSO4 · H2O

MgSO4

MAIN CONTENT

≥99.0%

≥99.0%

≥98.0%

MAGNESIUM SULPHATE(MgSO4)

≥48.59%

≥86.00%

≥98.00%

MAGNESIUM OXIDE(MgO)

≥16.24%

≥28.69%

≥32.66%

MAGNESIUM(Mg)

≥9.80%

≥17.21%

≥19.6%

FERRON(Fe)

≤0.0015%

≤0.0015%

≤0.0015%

CHLORIDE(Cl)

≤0.014%

≤0.014%

≤0.014%

HEAVY METAL(Pb)

≤0.0006%

≤0.0008%

≤0.0008%

ARSENIC(As)

≤0.0002%

≤0.0002%

≤0.0002%