Potassium pyrosulfite

The sodium and potassium salts of S02 are simpler and more pleasant to use as they do not have the odor of the pure liquid or the 5% water solution. They are rapidly soluble in must where they react with a small portion of the natural acid present to liberate S02. There are two sodium salts of S02 available, Na2S03 (neutral sodium sulfite) and NaHS03 (sodium acid sulfite). The latter compound introduces less sodium into the wine and removes less acid from the wine for an equivalent amount of S02 liberated. Potassium acid sulfite and potassium pyrosulfite (potassium metabisulfite) are the two salts of potassium with S02 that are readily available, soluble in grape juice, and capable of yielding S02 upon reaction with the acid of the juice. Potassium salt is recommended when it is desired to keep the wine low in sodium ion content for diet reasons. The salts should be edible or food product grade, that is, free of heavy metals and other toxic impurities. They must be stored in tightly closed containers or they will react with the water vapor and... 

Potassium pentachloronitrido-osmate(VI), 6 206 Potassium permanganate, solution of, standardization of, for determination of average atomic weight of rare earth elements in oxalates, 2 60, 61 Potassium pyrosulfite, 2 166 and its f-hydrate, 2 165, 167 Potassium rare earth sulfates, 2 47 Potassium selenocyanate, 2 186 Potassium sulfites, KHSO , in solution, 2 167... 

S20 K2 Potassium pyrosulfite, 2 165, 166 %-hydrate, 2 165 S20sK2-4S03KH, 2 167 S203Na2 (and + 7H20) Sodium pyrosulfite, 2 162, 164, 165 S20 Ba-2H20 Barium dithionate, 2 170... 

Disulfurous acid dipotassium pyrosulfite dipotassium salt E224 kali disulfis potassium pyrosulfite. 

The unripe apples were homogenized in potassium pyrosulfite solution, and the mixture was allowed to stand for 1 day. The supernatant was centrifuged and filtered with a glass filter funnel. The filtrate was apphed to adsorption chromatography, and the ACT fraction was evaporated and lyophilized. Purified ACTs were a mixture of monomer (catechin and/or epicatechin) and oligomers from dimers to pentadecamers, as shown in Fig. 2. 

UN NA 2693 (DOT) INS224 E224 Synonyms Dipotassium disulfite Dipotassium pyrosulfite Disulfurous acid dipotassium salt KMS Potassium disulfite Potassium pyrosulfite Classification Inorganic salt Empirical K2O5S2 Formula K2S2O5... 

Potassium metabisulfite (potassium pyrosulfite) is used as an antifermenting agent in breweries and wineries, and to bleach straw. Sodium bisulfite (sodium acid sulfite) is mainly used in pharmaceutical products, as disinfectant or bleach, and in the dye industry. Sodium sulfite is used in photographic developers, for fixing prints, bleaching textile fibers, and as a preservative in the food industry. 

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