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Langfang Tianke Biotechnology
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Sodium sulfite

Sodium sulfite

Molecular formula: Na2SO3
Molecular weight: 126.04
CAS NO: 7757-83-7
Properties: white powder with sulfur dioxide odor. It is gradually oxidized to sodium sulfate in the air. Soluble in water and slightly soluble in ethyl alcohol. Relative density is 2.663.
Uses: as analytical reagent, reducing agent, preservative and developing agent. It can be used in pharmaceutical industry.
Standard: maximum assay of impurities is in 百分比

Specification/item

Analytically pure-AR

Chemically pure-CP

High pure

Assay(Na2SO3)

≥97.0

≥95.0

≥96.0

Clarity test

Qualified

Qualified

 

Water insoluble matter

≤0.005

≤0.01

≤0.03

Acid sulphite (Na2SO3)

Qualified

Qualified

 

Free alkali (Na2CO3)

≤0.1

≤0.3

≤0.5

Chloride (Cl)

≤0.005

≤0.02

≤0.05

Thiosulfate (S2O3)

≤0.01

≤0.02

≤0.04

Iron (Fe)

≤0.0005

≤0.002

≤0.003

Heavy metal (Pb)

≤0.001

≤0.002

≤0.003

Arsenic (As)

≤0.0001

≤0.0005

≤0.001

Packing: woven bag lined with plastic bag, kraft paper bag, or fiber drum, net weight is 25kg.

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