title: Miniaturised centrifugal solid phase extraction platforms for in-field sampling, pre-concentration and spectrometric detection of organic pollutants in aqueous samples.
abstract: Great variations in pollutant concentrations are observed in the environment and pre-concentration is often required to detect trace contaminants in water samples. This paper presents a novel solid phase-extraction device integrated onto a centrifugal microfluidic platform for rapid on-site pre-concentration and screening of organic contaminants in aqueous samples. In-column fluorescence and absorbance measurements are obtained directly from an analyte trapped on the top of a solid phase extraction microcolumn. Results are presented for the representative fluorophore fluorescein and the polycyclic aromatic hydrocarbon anthracene. An absolute detection limit of 20 ng was obtained for anthracene using a simple light emitting diode for fluorescence excitation. One of the main advantages of this device is that only a simple motor is needed to induce liquid flow, making simultaneous on-site extraction and measurement of multiple samples easy while minimizing sample losses and contamination.
authors.affiliation: Department of Chemistry, McGill University, 801 Sherbrooke St W., Montreal, Qc, Canada.
authors.forename: Josiane P
authors.initials: JP
authors.lastname: Lafleur
authors.forename: Andrien A
authors.initials: AA
authors.lastname: Rackov
authors.forename: Scott
authors.initials: S
authors.lastname: McAuley
authors.forename: Eric D
authors.initials: ED
authors.lastname: Salin