Abstract
The Water Framework Directive (WFD) includes some polybrominated diphenyl ethers (PBDEs) in the list of priority substances that must be measured in surface waters at very low concentrations. The typical approaches applied to the determination of PBDEs in environmental samples might not meet the demanding requirements of the WFD. In this work, the instrumental capabilities of the mass-spectrometry (MS) techniques most frequently used in the determination of PBDEs, namely gas chromatography–negative-chemical-ionisation MS (GC–NCI MS) and GC–electrospray-ionisation tandem MS (EI MS–MS), are evaluated in comparison with highly sensitive GC–inductively-coupled-plasma MS (ICP-MS) for the reliable determination of PBDEs according to the WFD. Three analytical methods based on the liquid–liquid extraction of water samples and measurement of the extracts by GC–NCI MS, GC–EI MS–MS, or GC–ICP-MS are described. The priority PBDEs were quantified in different types of water sample by means of isotope-dilution mass spectrometry (IDMS) using 81Br-labelled or 13C-labelled PBDEs spikes, depending on the selected ionisation source. The three proposed methods met the requirements of the European legislation in terms of LOQs and expanded uncertainties. The determination method using 81Br-labelled PBDEs and GC–ICP-MS had the highest sensitivity and the lowest instrumental limits of detection and expanded uncertainties.
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Acknowledgments
The research leading to these results has received funding from the European Union on the basis of Decision No 912/2009/EC within the context of an EMRP Research Grant, which was part of the EURAMET JRP ENV08 -Traceable measurements for monitoring critical pollutants under the European Water Framework Directive (WFD-2000/60/EC). The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.
The authors would also like to acknowledge Peter Planitz and Bernhard Rothweiler from Agilent Technologies (Waldbronn, Germany) for the help and the permission to use the GC–MS–MS at the Agilent application lab.
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All authors certify that there is no actual or potential conflict of interest in relation to this article.
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Gonzalez-Gago, A., Pröfrock, D. & Prange, A. Comparison of GC–NCI MS, GC–ICP-MS, and GC–EI MS–MS for the determination of PBDEs in water samples according to the Water Framework Directive. Anal Bioanal Chem 407, 8009–8018 (2015). https://doi.org/10.1007/s00216-015-8973-y
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DOI: https://doi.org/10.1007/s00216-015-8973-y