Impacts of dam draining on the mobility of heavy metals and arsenic in water and basin bottom sediments of three studied dams in Germany

The Science of the Total Environment
Jens HahnGabriela Laufenberg

Abstract

The draining of a dam is a relatively rare event, however, it can have severe consequences for a watercourse connected to that reservoir. In order to understand the effects of the draining on the mobility of pollutants stored in the bottom sediments, the concentrations of heavy metals and arsenic were measured in pore water, river water, and sediments sampled from three emptied reservoirs in Germany. Two of these sites were analyzed immediately after the draining, while the third reservoir was studied one and a half years after the complete discharge of the stored water. Heavy metal and arsenic concentrations within the sediments varied among the studied dams as a result of different geological characteristics and the degree of anthropogenic impacts. Based on the analysis of pore water samples, the concentrations of heavy metals and arsenic were not significantly altered shortly after the draining. However, increased concentrations of As, Fe, Cd, Ni, and Zn were measured in pore water samples after a longer duration of sediment exposure, which altered the redox conditions and sediment properties. The changes in Cu, Cr, Mn, and Pb concentrations in pore water samples were less pronounced. As a result of the pore water drainage i...Continue Reading

Citations

Dec 20, 2018·International Journal of Environmental Research and Public Health·Bin LiangJinke Liu
Mar 25, 2020·Environmental Science and Pollution Research International·Bo YanLi-Li Li
Feb 18, 2021·Environmental Science and Pollution Research International·Sen GuoGuanglei Zhao
May 29, 2021·Scientific Reports·V I PoletaevaM V Pastukhov
Sep 9, 2021·Environmental Science and Pollution Research International·Kangkang HeJingan Chen

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