TY - JOUR A1 - Koch, Matthias A1 - Köppen, Robert A1 - Siegel, David A1 - Witt, Angelika A1 - Nehls, Irene T1 - Determination of total sulfite in wine by ion chromatography after in-sample oxidation N2 - Sulfur dioxide (SO2) or sulfites are the most common preservatives used in winemaking. The level of total SO2 is subject to regulation. Currently, the regulatory determination of total SO2 (including sulfites) is done by the optimized Monier–Williams (OMW) method, which includes time-consuming distillation and titration steps. This paper describes the development and application of an alternative, rapid, straightforward, and reliable method for the determination of total sulfite in wine. In this method, a simple oxidation step using alkaline hydrogen peroxide (H2O2) solution is followed by ion chromatographic (IC) analysis of sulfate coupled with conductometric detection. Thirteen wines were analyzed in order to compare the in-sample oxidation method with the OMW-procedure. A t-test revealed satisfying compliance regarding sample preparation, i.e., alkaline H2O2 treatment and acidic distillation (OMW method). Comparable results were also obtained between IC analysis and acid/base titration. Our results indicate that the novel method (limit of quantification: 4 mg SO2 L-1) is well suited for the cost-efficient monitoring of regulatory limits. KW - Sulfur dioxide KW - Wine analysis KW - Hydrogen peroxide oxidation KW - IC KW - Optimized Monier-Williams method PY - 2010 U6 - https://doi.org/10.1021/jf102086x SN - 0021-8561 SN - 1520-5118 VL - 58 IS - 17 SP - 9463 EP - 9467 PB - American Chemical Society CY - Columbus, Ohio AN - OPUS4-21912 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -