title: Determination of free and total sulfites in wine using an automatic flow injection analysis system with voltammetric detection.
abstract: An automated flow injection analysis (FIA) system, based on an initial analyte separation by gas-diffusion and subsequent determination by square-wave voltammetry (SWV) in a flow cell, was developed for the determination of total and free sulfur dioxide (SO(2)) in wine. The proposed method was compared with two iodometric methodologies (the Ripper method and a simplified method commonly used by the wine industry). The developed method displayed good repeatability (RSD lower than 6%) and linearity (between 10 and 250 mg l(-1)) as well as a suitable LOD (3 mg l(-1)) and LOQ (9 mg l(-1)). A major advantage of this system is that SO(2) is directly detected by flow SWV.
authors.affiliation: REQUIMTE-Departamento de Quimica, Faculdade de Ciencias, Universidade do Porto, 4169-007 Porto, Portugal. luis.goncalves@fc.up.pt
authors.forename: Luis Moreira
authors.initials: LM
authors.lastname: Goncalves
authors.forename: Joao
authors.initials: J
authors.lastname: Grosso Pacheco
authors.forename: Paulo
authors.initials: P
authors.lastname: Jorge Magalhaes
authors.forename: Jose
authors.initials: J
authors.lastname: Antonio Rodrigues
authors.forename: Aquiles
authors.initials: A
authors.lastname: Araujo Barros
mesh_terms: D001331:Automation; D004563:Electrochemistry / Q000379:methods*; D017022:Flow Injection Analysis / Q000295:instrumentation*; D057230:Limit of Detection; D013447:Sulfites / Q000032:analysis*; D014920:Wine / Q000032:analysis*
chemical_list: D013447:Sulfites