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Accepted version

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2014-08-22

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/99019

Solid-phase extraction and field-amplified sample injection-capillary zone electrophoresis for the analysis of benzophenone UV-filters in environmental water samples

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http://dx.doi.org/10.1007/s00216-014-8086-z

Abstract

A field amplified sample injection-capillary zone electrophoresis (FASI-CZE) method for the analysis of benzophenone (BP) UV-filters in environmental water samples was developed, allowing the separation of all compounds in less than 8 minutes. A 9- to 25-fold sensitive enhancement was obtained with FASI-CZE, achieving limits of detection down to 21-59 µg/L for most of the analyzed BPs, with acceptable run-to-run and day-to-day precisions (relative standard deviations lower than 17%). In order to remove water sample salinity and to enhance FASI sensitivity, an off-line solid-phase extraction (SPE) procedure using a Strata X polymeric reversed-phase sorbent was proposed, obtaining recoveries up to 72-90% for most of benzophenones. With the combination of off-line SPE and FASI-CZE, limits of detection in the range 0.06-0.6 µg/L in a river water matrix, representing a 2400- to 6500-fold enhancement, were obtained. Method performance was evaluated by quantifying a blank river water sample spiked at 1 µg/L. For a 95% confidence level, no statistical differences were observed between found concentrations and spiked concentrations (probability at the confidence level, p value, of 0.60), showing that the proposed off-line SPE-FASI-CZE method is suitable for the analysis of benzophenone UV-filters in environmental water samples at low µg/L levels. The method was successfully applied to the analysis of BPs in river water samples collected before and after industrialized and urban areas, and in some drinking water samples.

Subject

Anàlisi de l'aigua, Electroforesi capil·lar

Subject (English)

Water analysis, Capillary electrophoresis

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Articles publicats en revistes (Enginyeria Química i Química Analítica)

Citation

PURRÀ, Miquel, et al. Solid-phase extraction and field-amplified sample injection-capillary zone electrophoresis for the analysis of benzophenone UV-filters in environmental water samples. Analytical and Bioanalytical Chemistry. 2014. Vol. 406, num. 25, pags. 6189-6202. ISSN 1618-2642. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/99019

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