Potassium Metabisulfite

(redirected from Potassium metabisulphite)

potassium metabisulfite

[pə′tas·ē·əm ‚med·ə·bī′səl‚fīt]
(inorganic chemistry)
K2S2O5 White granules or powder, decomposing at 150-190°C; used as an antiseptic, for winemaking, food preservation, and process engraving, and as a source for sulfurous acid. Also known as potassium pyrosulfite.

Potassium Metabisulfite


K2S2O5, a salt of pyrosulfurous acid; density, 2.34 g/cm3. Decomposition occurs upon heating to 190°C. Solubility in water at 20°C, 30.9 percent. Potassium metabisulfite is used in the textile industry for dyeing and cotton printing. It is a component of certain photographic developers and solutions used in photographic fixing.

References in periodicals archive ?
Sulphur dioxide — sulphites (E 220-228: Sulphur dioxide, Sodium sulphite, Sodium hydrogen sulphite, Sodium metabisulphite, Potassium metabisulphite, Calcium sulphite, Calcium hydrogen sulphite, Potassium hydrogen sulphite) are allowed to be used as preservative and antioxidant in aromatized wine-based products.
Sugar, lemon juice (or citric acid) and potassium metabisulphite are then added to the pulp so that mixture contains 25pc TSS (total soluble solids) as determined by a refractometer.
Potassium metabisulphite (KMS) at a rate of 200 ppm added to avoid growth of wild yeast and Diammonium orthophosphate at a rate of 0.