Declining Dioxin Concentrations in the Rhone River Basin, France, Attest to the Effectiveness of Emissions Controls

Peter C. Van Metre 1 Marc Babut 2 Brice Mourier 3 Barbara J. Mahler 1 Gwenaëlle Roux 3 Marc Desmet 4
1 US Geological Survey [Austin]
2 UR MALY - Milieux aquatiques, écologie et pollutions
3 LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés
4 GéhCO EA6293 - GéoHydrosystèmes COntinentaux
Abstract : Emission-control policies have been implemented in Europe and North America since the 1990s for polychlorodibenzodioxins (PCDDs) and furans (PCDFs). To assess the e␣ect of these policies on temporal trends and spatial patterns for these compounds in a large European river system, sediment cores were collected in seven depositional areas along the Rhone River in France, dated, and analyzed for PCDDs and PCDFs. Results show concentrations increase in the downstream direction and have decreased temporally at all sites during the last two decades, with an average decrease of 83% from 1992 to 2010. The time for a 50% decrease in concentrations (t1/2) averaged 6.9 ± 2.6 and 9.1 ± 2.9 years for the sum of measured PCDDs and PCDFs, respectively. Congener patterns are similar among cores and indicate dominance of regional atmospheric deposition and possibly weathered local sources. Local sources are clearly indicated at the most downstream site, where concentrations of the most toxic dioxin, TCDD, are about 2 orders of magnitude higher than at the other six sites. The relatively steep downward trends attest to the e␣ects of the dioxin emissions reduction policy in Europe and suggest that risks posed to aquatic life in the Rhone River basin from dioxins and furans have been greatly reduced.
Type de document :
Article dans une revue
Environmental Science & Technology, American Chemical Society, 2015, 49, pp.12723-12730. 〈10.1021/acs.est.5b03416〉
Liste complète des métadonnées
https://hal-sde.archives-ouvertes.fr/hal-01328503
Contributeur : Nathalie Lyvet <>
Soumis le : mercredi 8 juin 2016 - 10:30:40
Dernière modification le : jeudi 19 avril 2018 - 14:28:02

Identifiants

Collections

ENTPE | IRSTEA | INRA | BIOENVIS | UNIV-LYON1

Citation

Peter C. Van Metre, Marc Babut, Brice Mourier, Barbara J. Mahler, Gwenaëlle Roux, et al.. Declining Dioxin Concentrations in the Rhone River Basin, France, Attest to the Effectiveness of Emissions Controls. Environmental Science & Technology, American Chemical Society, 2015, 49, pp.12723-12730. 〈10.1021/acs.est.5b03416〉. 〈hal-01328503〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

110

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD