Journal
ELECTROPHORESIS
Volume 27, Issue 23, Pages 4694-4702Publisher
WILEY
DOI: 10.1002/elps.200600210
Keywords
biological analyses; environmental analyses; MEKC; polynuclear aromatic hydrocarbons; stir bar sorptive extraction; water and sediment samples
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In this work, stir bar sorptive extraction and liquid desorption was combined with MEKC and diode-array detection (SBSE-LD-MEKC-DAD) for the determination of polynuclear aromatic hydrocarbons (PAHs) in aqueous medium, using biphenyl, fluorene, anthracene, phenanthrene, fluoranthene and pyrene as model compounds. MEKC-DAD conditions and parameters affecting SBSE-LD efficiency are fully discussed. Assays performed on aqueous samples spiked at trace levels, yielded recoveries ranging from 55.5 +/- 6.1% (pyrene) to 70.7 +/- 7.1% (anthracene), under optimized experimental conditions. The methodology proved to be nearly described by the octanol-water partition coefficients (K-PDMS/W approximate to K-O/W). The analytical performance showed good precision (< 12.0%), suitable detection limits (2-11 mu g/L) and convenient linear dynamic ranges (r(2)> 0.99) from 5 to 25 mu g/L for anthracene and 25 to 125 mu g/L for the remaining compounds. The application of the proposed methodology to environmental water, sediments and fish bile matrices demonstrated good selectivity and accuracy. SBSE-LD combined with MEKC-DAD was shown to be an easy, reliable and robustness methodology, as well as a good analytical alternative to monitor environmental priority pollutants.
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