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Sodium Sulfite Anhydrous


Property: white gravel or powder crystal,relative density is 1.561, less to dissolve in water and its water solution has alkaline reaction; it is hard to dissolve in ethanol. It is used to produce chloroform,solasulfone and Benzaldehyde in medical industry.
Molecular Formula : Na2SO3
Molecule Weight : 126.04
CAS NO .: 7757-83-7
Appearance : White Free Flowing Fine Crystal or Powder
Specification for Industry Grade and Food Grade :
Item
Quality Index
Industry Grade
Food Grade
Purity ( As Na2SO3)
96.0% min
98.0% min
Sodium sulphate ( SO4)
2.5% max
1.5% max
Chlorides ( As NaCL)
0.5% max
0.1% max
Arsenic ( As )
-
0.0002% max
Heavy metals ( As Pb )
-
0.0005% max
Iron (Fe)
0.005% max
0.002% max
Water insolubles
0.05% max
0.02% max
 
Specification For Photo Grade and Pharmaceutical Grade
Item
Quality Index
Photo Grade
Pharmaceutical Grade
Purity ( As Na2SO3)
98.0% min
98.0% min
Sodium sulphate ( SO4 )
1.5% max
1.5% max
Chlorides ( As CL-)
0.05% max
0.05% max
Arsenic ( As )
0.0002% max
2ppm max
Lead ( As Pb)
0.0005% max
2ppm max
Iron (Fe)
0.001% max
5ppm max
Selenium ( Se)
0.0001% max
1ppm max
Zinc ( Zn)
0.0001% max
 



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