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Etude de l’écodynamique des polluants organiques persistants et des micropolluants halogénés d’intérêt émergent dans les milieux aquatiques

Abstract : PCBs (polychlorinated biphenyls), PBDEs (polybrominated biphenyl ethers) and OCPs (organochlorine pesticides) are anthropogenic compounds classified as POPs (Persistent Organic Pollutants), their use was restricted or prohibited. These compounds are ubiquitous, persistent and bioaccumulative and they are still present in the environment; this is the reason why it is important to continue the study of the fate and impact in the environment. Due to their usage restriction, other compounds are now used to replace them, such as alternative flame retardants (RFAs). These brominated and chlorinated compounds have physicochemical properties comparable to those of POPs and can thus be potentially hazardous to the environment. In addition, RFAs are expected to occur at lower concentrations than PCBs and PBDEs, whether in the biotic and abiotic compartments. Thus, one of the challenges of the present work was to develop a multiresidue method, based on gas chromatography coupled with a time-of-flight mass spectrometer, allowing for the simultaneous analysis of 17 RFAs at levels below ng.g-1. The levels and patterns of POP and RFA contamination were reported in the biotic and abiotic compartments of selected hydrosystems. The biomagnification potential of these compounds was also studied by determining trophic magnification factors (TMF) in the Gironde estuary and in the Rhône basin. In the Gironde estuary, it was shown that some RFA biomagnify as much or more than some historical POPs. Furthermore, in the Rhône basin, the use of TMF for predictive purpose, for BDE-47 or ΣPBDEs-WFD for example, was discussed and found possible.
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Submitted on : Friday, February 2, 2018 - 1:07:05 AM
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Mathilde Lauzent. Etude de l’écodynamique des polluants organiques persistants et des micropolluants halogénés d’intérêt émergent dans les milieux aquatiques. Chimie analytique. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0733⟩. ⟨tel-01699067⟩

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