Collect. Czech. Chem. Commun. 2010, 75, 721-730
Published online 2010-07-08 09:46:15

Use of a membraneless extraction module for the voltammetric determination of total sulfites in wine

Luís Moreira Gonçalves*, Miriam Franco da Anunciação, Inês Maria Valente, João Grosso Pacheco, José António Rodrigues and Aquiles Araújo Barros

Requimte, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre No. 687, 4169-007 Porto, Portugal


A recently developed membraneless extraction module (MLEM) for sample preparation aiming the analysis of volatile and semi-volatile compounds is applied in the voltammetric analysis of total sulfites in wine. Square-wave voltammetry (SWV) is very advantageous in this case because sulfur dioxide (SO2) is instrumentally directly detected. The developed method shows good repeatability (RSD lower than 5%) and linearity (between 20 to 220 mg l–1) as well as suitable limits of detection (6 mg l–1) and quantification (19 mg l–1). The proposed method was also compared with the reference methodology (an iodimetry, the Ripper method) showing no significant differences in the obtained results.

Keywords: Square-wave voltammetry (SWV); Membraneless extraction module (MLEM); Wine; Sulfur dioxide (SO2); Sulfites; Electroanalysis.

References: 41 live references.