Abstract
A methodology for the extraction and quantification of 16 polycyclic aromatic hydrocarbons (PAHs) based on microwave-assisted extraction coupled with headspace solid-phase microextraction followed by gas chromatography/mass spectroscopy was validated for needles and bark of two pine species (Pinus pinaster Ait. and Pinus pinea L.). The limits of detection were below 0.92 ng g−1 (dry weight) for needles and below 0.43 ng g−1 (dw) for bark. Recovery assays were performed with two sample masses spiked at three levels and the overall mean values were between 70 and 110 % for P. pinaster and 75 and 129 % for P. pinea. In the first species, the increase in sample mass lowered the recoveries slightly for most PAHs, whereas for the second, the recoveries were higher for the needles. Naturally contaminated samples from 4 sites were analysed, with higher levels for urban sites (1,320 and 942 ng g−1 (dw) vs. 272 and 111 ng g−1 (dw) for needles and 696 and 488 ng g−1 (dw) vs. 270 and 103 ng g−1 (dw) for bark) than for rural ones and also for P. pinaster samples over P. pinea. It is also shown that gas-phase PAHs are predominant in the needles (over 65 % of the total PAHs) and that the incidence for particulate material in bark, reaching 40 % as opposed to a maximum below 20 % for the needles. The method has proved to be fit and improved some of the existing approaches, on the assessment of particulate PAHs and bark levels.
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Acknowledgements
The authors wish to thank Fundação para a Ciência e a Tecnologia (Portugal) for the post-doctoral grant SFRH/BPD/67088/2009 and the project PTDC/AGR-CFL/102597/2008.
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Ratola, N., Herbert, P. & Alves, A. Microwave-assisted headspace solid-phase microextraction to quantify polycyclic aromatic hydrocarbons in pine trees. Anal Bioanal Chem 403, 1761–1769 (2012). https://doi.org/10.1007/s00216-012-5962-2
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DOI: https://doi.org/10.1007/s00216-012-5962-2