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Potassium metabisulfite

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Description
Application
Properties

Other names

  • Potassium pyrosulfite
  • Potassium metabisulfite
  • Dipotassium disulfite
  • Dipotassium disulphite

Product description

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.

Origin

  • China
  • Germany
  • Food industry: used as food additive-e224 preservative, antioxidant, bleach
  • Potassium metabisulfite is a common wine or must additive, in which it forms sulfur dioxide gas (SO2). This both prevents most wild microorganisms from growing, and it acts as a potent antioxidant, protecting both the color and delicate flavors of wine.
  • Potassium metabisulfite is sometimes used in the brewing industry to inhibit the growth of wild bacteria and fungi. This is called 'stabilizing'. It is also used to neutralize chloramine that has been added to tap water at the source as a disinfectant.
  • In the purification of drinking water
  • Confectionery industry: for the processing of dried fruits
  • Potassium metabisulfite is sometimes added to lemon juice as a preservative.
  • Potassium metabisulfite is used in the textile industry for dyeing and cotton printing.
  • Potassium metabisulfite is sometimes used to precipitate gold from solution in aqua regia (as an alternative to sodium sulfite).
  • It is a component of certain photographic developers and solutions used in photographic fixing.
  • It is used as a bleaching agent in the production of Coconut cream.
  • It is used in some pickles as a preservative.
  • It is used in tint etching iron-based metal samples for microstructural analysis
Colour White
Appearance Crystalline powder
Odor Pungent (sulfur dioxide)
Solubility In water 450 g/l (20 °C)

Insoluble in ethanol

Assay Not less than 97,2%
Industry sectors
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