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Saturday, March 31, 2012

Potassium metabisulfite





  • Potassium metabisulfite, K2S2O5, also known as potassium pyrosulfite, is a white crystalline powder with a pungent sulfur odour. The main use for the chemical is as an antioxidant or chemical sterilant.
  • It is a disulfite and is chemically very similar to sodium metabisulfite, with which it is sometimes used interchangeably. 
  • Potassium metabisulfite is generally preferred out of the two as it does not contribute sodium to the diet.
  • Potassium metabisulfite has a monoclinic crystal structure which decomposes at 190 °C, yielding potassium oxide and sulfur dioxide.

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