Determination of polychlorinated biphenyls in ambient air by gas chromatography coupled to triple quadrupole tandem mass spectrometry |
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Authors: | Rosa Martínez Ocaña Angela Mena Granero Francisco Javier Egea Gonzalez Antonia Garrido Frenich José Luis Martínez Vidal Patricia Plaza Bolaños |
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Institution: | (1) Department of Analytical Chemistry, University of Almería, 04071 Almería, Spain |
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Abstract: | A multiresidue method for determining 22 polychlorinated biphenyls (PCBs) in air has been developed and validated by gas chromatography
(GC) coupled to tandem mass spectrometry (MS/MS) using a triple quadrupole analyzer (QqQ). The method was validated in terms
of both steps of sampling and analysis. The sampling method, which is based on active sampling using polyurethane foam (PUF)
as adsorbent, was validated by generating standard atmospheres. The retention capacity of this sampling sorbent allows up
to 5 m3 of air to be sampled without any breakthrough for most compounds. Two solvent extraction methods were compared: sonication
and Soxhlet extraction with a mixture of n-hexane:diethyl ether (95:5 v/v). Both extraction methods yielded similar results, but the first one required less solvent
and time. The method exhibited good accuracy (80.3–99.8%), precision (2.2–15.2%) and lower limits that allowed quantification
and confirmation at levels as low as 0.008 ng/m3. Finally, the method was applied to the analysis of PCBs in the air in areas near to a municipal solid-waste landfill and
directly above the refuse in the landfill, where it indicatedd the presence of some of the target compounds.
Figure General chemical structure of polychlorinated biphenyls |
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Keywords: | Polychlorinated biphenyls Air analysis Gas chromatography Tandem mass spectrometry Triple quadrupole |
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