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

Peter C. van Metre; Marc Babut; Brice Mourier; Barbara J. Mahler; Gwenaëlle Roux; Marc Desmet

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.

Document type :

Journal articles

Domain :

Environmental Sciences / Biodiversity and Ecology

Complete list of metadatas

https://hal-sde.archives-ouvertes.fr/hal-01328503
Contributor : Nathalie Lyvet <>
Submitted on : Wednesday, June 8, 2016 - 10:30:40 AM
Last modification on : Monday, September 2, 2019 - 2:46:13 PM

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

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

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