title: Hyphenation of gas-diffusion separation and ion chromatography. Part 1: determination of free sulfite in wines.
abstract: The hyphenation of gas-diffusion separation and ion chromatography (IC) is described as a convenient, reliable, robust, and economic method for in-line sample pre-treatment. The high selectivity associated with this method permits direct analysis of samples containing microparticulates, colloidal matter, and/or high molecular weight compounds. The determination of sulfite serves as a first example of its application. The method is based on the diffusional separation of SO2 following in-line oxidation with hydrogen peroxide to sulfate and final determination of the sulfate formed using IC. The influence of operational parameters has been thoroughly investigated and gas-diffusion cells of different geometries compared with respect to the gas-transfer rates obtained. Application to the analysis of wines demonstrates the utility of the method.
authors.affiliation: Department of Analytical Chemistry, Stockholm University, Sweden.
authors.forename: S
authors.initials: S
authors.lastname: Fäldt
authors.forename: B
authors.initials: B
authors.lastname: Karlberg
authors.forename: W
authors.initials: W
authors.lastname: Frenzel
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry; D012985:Software Design; D013447:Sulfites / Q000032:analysis; D013458:Sulfur Dioxide / Q000737:chemistry; D014920:Wine / Q000032:analysis
chemical_list: D013447:Sulfites; D013458:Sulfur Dioxide; D006861:Hydrogen Peroxide