Heavy rainfall provokes anticoagulant rodenticides' release from baited sewer systems and outdoor surfaces into receiving streams.

Autor: Regnery J; Department of Biochemistry, Ecotoxicology, Federal Institute of Hydrology, 56068 Koblenz, Germany. Electronic address: Regnery@bafg.de., Schulz RS; Department of Biochemistry, Ecotoxicology, Federal Institute of Hydrology, 56068 Koblenz, Germany., Parrhysius P; Department of Biochemistry, Ecotoxicology, Federal Institute of Hydrology, 56068 Koblenz, Germany., Bachtin J; Department of Biochemistry, Ecotoxicology, Federal Institute of Hydrology, 56068 Koblenz, Germany., Brinke M; Department of Biochemistry, Ecotoxicology, Federal Institute of Hydrology, 56068 Koblenz, Germany., Schäfer S; Department of Biochemistry, Ecotoxicology, Federal Institute of Hydrology, 56068 Koblenz, Germany., Reifferscheid G; Department of Biochemistry, Ecotoxicology, Federal Institute of Hydrology, 56068 Koblenz, Germany., Friesen A; Section IV 1.2 Biocides, German Environment Agency, 06813 Dessau-Rosslau, Germany.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2020 Oct 20; Vol. 740, pp. 139905. Date of Electronic Publication: 2020 Jun 10.
DOI: 10.1016/j.scitotenv.2020.139905
Abstrakt: Prevalent findings of anticoagulant rodenticide (AR) residues in liver tissue of freshwater fish recently emphasized the existence of aquatic exposure pathways. Thus, a comprehensive wastewater treatment plant and surface water monitoring campaign was conducted at two urban catchments in Germany in 2018 and 2019 to investigate potential emission sources of ARs into the aquatic environment. Over several months, the occurrence and fate of all eight ARs authorized in the European Union as well as two pharmaceutical anticoagulants was monitored in a variety of aqueous, solid, and biological environmental matrices during and after widespread sewer baiting with AR-containing bait. As a result, sewer baiting in combined sewer systems, besides outdoor rodent control at the surface, was identified as a substantial contributor of these biocidal active ingredients in the aquatic environment. In conjunction with heavy or prolonged precipitation during bait application in combined sewer systems, a direct link between sewer baiting and AR residues in wastewater treatment plant influent, effluent, and the liver of freshwater fish was established. Moreover, study results confirmed insufficient removal of anticoagulants during conventional wastewater treatment and thus indirect exposure of aquatic organisms in receiving streams via tertiary treated effluents and combined sewer overflows. Nevertheless, further research is required to determine the ecological implications and risks for aquatic organisms as well as fish-eating predators from chronic AR exposure at environmentally relevant concentrations.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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