Abstract
A rapid (less than 25 min) method for determination of total sulfur dioxide (SO2) in must or wine has been developed employing a Dionex 2010i ion chromatograph with anion exchange column and conductivity detector. A distillation step is avoided by diluting the filtered sample with 0.1 N NaOH:0.1% formaldehyde to an SO2 level of 5 to 25 mg/L and eluting with a carbonate/bicarbonate buffer (pH 9.6). Recovery from sulfite-spiked must :samples by ion chromatography was 94% to 118%. High performance liquid chromatography-ion chromatography (HPLC-IC) analysis measured 83% to 110% total SO2 compared to the official Modified Monier-Williams method, and the results were not significantly different (p < 0.01 ). With attention to sample dilution and detector attenuation, sulfate, tartrate, and malate can be determined simultaneously, making this a useful technique for following SO2 throughout winemaking, cellar treatment, and storage, as well as characterizing acid profiles.
- Received October 1985.
- Copyright 1987 by the American Society for Enology and Viticulture
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