Speciation and mobility of heavy metals in sediment layers at the saguenay river (Quebec, Canada) after a major flooding event
During the 40s and 50s the Saguenay River and Fjord received various metallurgic, plastic, aluminium and pulp and paper industries wastes discharges resulting in the high contamination of water and sediments. This contamination limited the exploitation of fish and seafood for decades. In July 1996 during a 50 year event flood, a new layer of sediments composed of debris, gravel and fine materials was transported and deposited over the ancient, one meter contaminated layer of sediments. Given that the new layer is composed essentially of cleaner material, the zone is presenting important changes in the direction of a healthier environment. This project evaluated the capacity of the new layer to retain the contaminants left at the bottom layer. Particular interest is given to heavy metals (Pb, Zn, Cd, and Ni) and to their geochemical distribution among natural adsorbing materials such as clays, oxides, carbonates and organic matter. The study included mission on the Alcide Horth Research Ship, contamination profiles, geochemical distribution of heavy metals on the contaminated layer, transition layer and new layer as well as the evolution of retention and transfer.
heavy metals sediments speciation retention
Rosa Galvez Jacques Locat -Turcotte
Professor, Department of Civil Engineering. Laval University, Quebec, Canada Professor, Department of Geology, Laval University, Quebec, Canada, Research Isabelle Aube Assistant, Department of Civil Engineering, Laval University, Quebec, Canada
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
770-771
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）