Potassium Metabisulfite

Also found in: Wikipedia.

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 ?
At this point, Brahm adds potassium metabisulfite, looking to have 70-80 ppm.
To aid in your label reading, there are six names used for sulfites: sulfur dioxide, sodium sulfite, sodium bisulfite, potassium bisulfite, sodium metabisulfite, and potassium metabisulfite.
SO2 addition (Liquid SO2 solution and Potassium metabisulfite addition, Molecular SO2 table, SO2 reduction);
Effects of ethanol, potassium metabisulfite, formaldehyde and hydrogen peroxide on gastric carcinogenesis in rats after initiation with N-methyl-N'-nitro-N-nitrosoguanidine.
To season a new barrel, rinse and fill it with a solution of potassium metabisulfite and water, until you're ready to fill it with wine.
If you're sulfite-sensitive, avoid foods that contain sulfur dioxide, sodium sulfite, sodium or potassium bisulfite, or sodium or potassium metabisulfite.
There are six sulfites found in foods; sulfur dioxide, potassium bisulfite, sodium bisulfite, sodium sulfite, potassium metabisulfite, and sodium metabisulfite.
They are a group of sulfur-based chemicals appearing as sulfur dioxide, sodium sulfite, sodium and potassium bisulfite, and sodium and potassium metabisulfite.
Six chemicals can be used: sulfur dioxide, sodium sulfite, sodium bisulfite, potassium bisulfite, sodium metabisulfite and potassium metabisulfite.
At completion of MLF, wines were moved to cold storage and treated with potassium metabisulfite with a dosage rate based on wine pH.