Abstract (EN):
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 (SO(2)) 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.
Idioma:
Inglês
Tipo (Avaliação Docente):
Científica
Contacto:
luis.goncalves@fc.up.pt; miriamfranco@netcabo.pt; inesmariavalente@sapo.pt; joao.pacheco@fc.up.pt; jarodrig@fc.up.pt; ajbarros@fc.up.pt
Nº de páginas:
10