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Title

A high-resolution historical sediment record of nutrients, trace elements and organochlorines (DDT and PCB) deposition in a drinking water reservoir (Lake Brêt, Switzerland) points at local and regional pollutant sources

Authors
Alencastro, Luiz Felippe de
Grandjean, Dominique
Published in Chemosphere. 2013, vol. 90, no. 9, p. 2444-2452
Abstract The 137Cs and 210Pb dating of a 61-cm long sediment core retrieved from a drinking water reservoir (Lake Brêt) located in Switzerland revealed a linear and relatively high sedimentation rate (~1 cm year-1) over the last decades. The continuous centimeter scale measurement of physical (porewater and granulometry), organic (Corg, P, N, HI and OI indexes) and mineral (Cmin and lithogenic trace elements) parameters therefore enables reconstructing the environmental history of the lake and anthropogenic pollutant input (trace metals, DDT and PCBs) at high resolution. A major change in the physical properties of the lowermost sediments occurred following the artificial rise of the dam in 1922. After ca. 1940, there was a longterm up-core increase in organic matter deposition attributed to enhance primary production and anoxic bottom water conditions due to excessive nutrient input from a watershed predominantly used for agriculture that also received domestic effluents of two wastewater-treatment plants.
Keywords SedimentsDrinking water reservoirTrace elementsOrganochlorinesOrganic matter
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Research group FORE9 Environmental microbiology
Citation
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THEVENON, Florian et al. A high-resolution historical sediment record of nutrients, trace elements and organochlorines (DDT and PCB) deposition in a drinking water reservoir (Lake Brêt, Switzerland) points at local and regional pollutant sources. In: Chemosphere, 2013, vol. 90, n° 9, p. 2444-2452. https://archive-ouverte.unige.ch/unige:26530

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Deposited on : 2013-03-04

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