Potassium metabisulphite: locut. Potassium metabisulphite (E224, food preservative) is a salt of inorganic origin which contains sulfur, capable of dissociating in an acidic medium to generate sulfur dioxide. It also has several names:
potassium bisulfite,
potassium pyrosulfite,
potassium pentaoxodysulfate
Potassium Metabisulfite absorbs moisture from the air and oxidizes to sulfate. It then releases 52 to 55% of its weight in SO2. It is useful ...
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