Abstract
The complexing, or binding, of potassium ions in dealcoholized wines was studied with a potassium electrode. Potassium concentrations are measured as considerably lower with the electrode than in flame photometry, but the two measurements converge when the wine is diluted or treated with charcoal. Those observations were interpreted as evidence of the binding of potassium by sulfate, tartrate and bitartrate ions, pigments, and other materials removed by charcoal. Control solutions containing potassium, sulfate, and tartrate at the same concentrations, pH, and ionic strength in dealcoholized wine show a percentage of bound potassium comparable to that in charcoal-treated dealcoholized wine.
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