Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/98197
Title: In-line preconcentration capillary zone electrophoresis for the analysis of haloacetic acids in water
Author: Bernad Marcos, Josep Oriol
Damascelli, Anna
Núñez Burcio, Oscar
Galcerán Huguet, M. Teresa
Keywords: Acetats
Aigua potable
Electroforesi capil·lar
Contaminants
Acetates
Drinking water
Capillary electrophoresis
Pollutants
Issue Date: 17-Aug-2011
Publisher: Wiley-VCH
Abstract: Two in-line enrichment procedures (large volume sample stacking (LVSS) and field amplified sample injection (FASI)) have been evaluated for the capillary zone electrophoresis (CZE) analysis of haloacetic acids (HAAs) in drinking water. For LVSS, separation on normal polarity by using 20 mM acetic acid-ammonium acetate (pH 5.5) containing 20% acetonitrile as BGE was required. For FASI, the optimum conditions were 25 s hydrodynamic injection (3.5 kPa) of a water plug followed by 25 s electrokinetic injection (-10 kV) of the sample, and 200 mM formic acid-ammonium formate buffer at pH 3.0 as BGE. For both FASI and LVSS methods, linear calibration curves (r2>0.992), limit of detection (LOD) on standards prepared in Milli-Q water (49.1-200 µg/L for LVSS and 4.2-48 µg/L for FASI), and both run-to-run and day-to-day precisions (RSD values up to 15.8% for concentration) were established. Due to the higher sensitive enhancement (up to 310-fold) achieved with FASI-CZE this method was selected for the analysis of HAAs in drinking water. However, for an optimal FASI application sample salinity was removed by solid phase extraction (SPE) using Oasis WAX cartridges. With SPE-FASI-CZE, method detection limits in the range 0.05-0.8 µg/L were obtained, with recoveries, in general, higher than 90% (around 65% for monochloroacetic and monobromoacetic acids). The applicability of the SPE-FASI-CZE method was evaluated by analyzing a drinking tap water from Barcelona where seven HAAs were found at concentration levels between 3-13 µg/L.
Note: Versió postprint del document publicat a: http://dx.doi.org/10.1002/elps.201000676
It is part of: Electrophoresis, 2011, vol. 32, num. 16, p. 2123-2130
Related resource: http://dx.doi.org/10.1002/elps.201000676
URI: http://hdl.handle.net/2445/98197
ISSN: 0173-0835
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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