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Biocidal substances in the Seine River: contribution from urban sources in the Paris megacity

Abstract : This work addresses river contamination by biocidal substances up- and downstream a megacity, with the aim of investigating the contribution of the urban discharges, and proposing effective and concerted mitigation solutions. To this end, ten campaigns were conducted in the two main rivers of the Paris conurbation. Eighteen previously prioritized biocides were all quantified at three sampling locations, and several were found at concentrations that may present a risk to the aquatic ecosystem (dichloroisothiazolinone, diuron, benzalkonium C12 and C14, with concentrations up to 42, 75, 1700, and 150 ng/L, respectively). The collected data enabled daily mass loads of biocides to be assessed (from <1 g/day to several tens of kg/day, the highest values being observed for benzalkonium C12 and C14) and put into perspective with previously characterized loads from the major urban sources. A shift in the distribution of biocide loads between up- and downstream the Paris conurbation was observed for several molecules (benzisothiazolinone, terbutryn, thiabendazole, the median load of which increased by a factor of 1.5 to 3), thus suggesting the contribution of urban discharges to the contamination of receiving waters by biocides. Analysing the long-term dynamics of biocides in the Seine River showed that even if the ban of several molecules as pesticides did have a noticeable impact on surface water contamination, a background pollution remained (3
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https://hal-enpc.archives-ouvertes.fr/hal-03772400
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Soumis le : jeudi 8 septembre 2022 - 11:37:52
Dernière modification le : jeudi 6 octobre 2022 - 08:01:52

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Claudia Paijens, Damien Tedoldi, Bertrand Frère, Romain Mailler, Vincent Rocher, et al.. Biocidal substances in the Seine River: contribution from urban sources in the Paris megacity. Environmental Science : Water Research and Technology, Royal Society of Chemistry, In press, ⟨10.1039/d2ew00253a⟩. ⟨hal-03772400⟩

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