Abstract
In this contribution, bar adsorptive micro-extraction using polystyrene–divinylbenzene sorbent phase and in situ derivatization with pentafluorophenyl hydrazine, followed by liquid desorption and high-performance liquid chromatography-diode array detection (BAμE(PS-DVB)PFPH in situ-LD/HPLC-DAD), was developed for the determination of six short-chain carbonyl compounds (formaldehyde, acetaldehyde, propanal, acetone, butanone, and 2-hexenal) in drinking water matrices. PFPH presented very good specificity as an in situ derivatization agent for short-chain ketones and aldehydes in aqueous media, allowing the formation of adducts with remarkable sensitivity, selectivity and the absence of photodegradation. Assays performed on 30-mL water samples spiked at the 25.0 μg L−1 levels, under optimized experimental conditions, yielded recoveries ranging from 47.4 ± 3.8% to 85.2 ± 3.8%, in which the PS-DVB proved to be a convenient sorbent phase. The analytical performance showed good accuracy, suitable precision (RSD < 13.0%), detection limits in between 47 and 132 ng L−1 and remarkable linear dynamic ranges (r 2 > 0.9907) from 1.0 to 80.0 μg L−1. By using the standard addition methodology, the application of the present method to drinking water samples treated with different disinfectants, namely, chloride, ozone and both, allowed very good performances to monitor these priority compounds at the trace level. The proposed methodology proved to be a feasible alternative for polar compound analysis, showing to be easy to implement, reliable, sensitive and requiring a low sample volume to monitor short-chain aldehydes and ketones in drinking water matrices.
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Acknowledgment
N.R. Neng (SFRH/BD/38660/2007) thanks Fundação para a Ciência e a Tecnologia (FCT) for the PhD grant.
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Neng, N.R., Nogueira, J.M.F. Determination of short-chain carbonyl compounds in drinking water matrices by bar adsorptive micro-extraction (BAμE) with in situ derivatization. Anal Bioanal Chem 398, 3155–3163 (2010). https://doi.org/10.1007/s00216-010-4256-9
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DOI: https://doi.org/10.1007/s00216-010-4256-9