title: A self-polishing platinum ring voltammetric sensor and its application to complex media.
abstract: A self-polishing voltammetric sensor was recently developed and has been applied to samples of urea, milk and sewage water. The polishing device continuously grinds a platinum ring electrode, offering a reproducible and clean electrode surface. Principal component analysis (PCA) and partial least squares (PLS) techniques were applied to interpret the data and to build prediction models. In an evaluation of samples with different urea concentrations, the grinding step allows for repeatable measurements, similar to those after electrochemical cleaning. Furthermore, for the determination of sewage water concentrations in drinking water and for the evaluation of different fat contents in milk samples, the polishing eliminates sensor drift produced by electrode fouling. The results show that the application of a self-polishing unit offers a promising tool for electrochemical studies of difficult analytes and complex media.
authors.affiliation: Departament de Química Analítica, Universitat de Barcelona, Martí i Franquès, 1-11, E-8028 Barcelona, Spain.
authors.forename: Santiago
authors.initials: S
authors.lastname: Cavanillas
authors.affiliation: Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden. Electronic address: frw@ifm.liu.se.
authors.forename: Fredrik
authors.initials: F
authors.lastname: Winquist
authors.affiliation: Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden.
authors.forename: Mats
authors.initials: M
authors.lastname: Eriksson
keywords: Drinking water; Electronic tongue; Milk; Sewage water; Urea; Voltammetric sensor