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langfang tianke biotechnology
professional production base of general chemical reagent and pharmaceutical accessories
hotline: 86-15076659665
products
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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 %

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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langfang tianke biotechnology co., ltd.
add: sanghang industrial park, dacheng county,
hebei, china
tel: 86-15076659665 manager ma
fax: 86-316-5569332 
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