Sodium Sulfite Anhydrous

Sodium Sulfite Anhydrous

Sodium sulfite anhydrous is a white granular material with the chemical formula Na2SO3.

General Use: Food and pharmaceutical, wastewater dechlorination agent, reducing agent, dietary supplement, color preservative and photographic applications.


  • - Dechlorination in municipal wastewater, pulp & paper, power, and textile water treatment plants
  • - Boiler water treatment
  • - Oxygen scavenger
  • - Preservative
  • - Pharmaceuticals
  • - Flue gas desulfurization
  • - Chemical manufacturing in the sulfonation process
  • - Preservative in photo developer solutions


Chemical Composition

Sodium Sulfite, wt % 99min
Sodium Sulfate, wt % 1max
Moisture, % 0.05max
Insolubles, % 0.03max
Sodium Chloride, ppm 50max
Iron (Fe), ppm 3max
Heavy Metals, (Pb) ppm 10max
Selenium, ppm 2max
Arsenic, ppm 1max
PH of 5% Solution (@ 25° C) 9.5-10.6
Ca/Mg NH40H Inso. % >0.50max
Alk. as Na2C03 % w/w 0.15max
  • - Ammonium Silver Nitrate Test *****Passes*****
  • - Molecular Weight 126.05
  • - Bulk Density 1.3 – 1.5 kg/dm3


Physical Properties

  • - White, free flowing crystalline
  • - Odorless powder
  • - Product conforms to the requirements of ANSI PH4 275:1980, ISO 418: 1994(E), BSS 3304 and Food Chemical Codex (FCC).


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