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Trace Metal Contamination and Solid Phase Partitioning of Metals in National Roadside Sediments Within the Watershed of Hoidong Reservoir in Pusan City  

Lee Pyeong-Koo (Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resources)
Kang Min-Joo (Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resources)
Youm Seung-Jun (Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resources)
Lee In-Gyeong (Department of Earth and Environmental Sciences, Chungbuk National University)
Park Sung-Won (Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resources)
Lee Wook-Jong (Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of Soil and Groundwater Environment / v.11, no.5, 2006 , pp. 20-34 More about this Journal
Abstract
This study was undertaken to assess the anthropogenic impact on trace metal concentrations (Zn, Cu, Pb, Cr, Ni, and Cd) of roadside sediments (N = 70) from No.7 national road within the watershed of Hoidong Reservoir in Pusan City and to estimate the potential mobility of selected metals using sequential extraction. We generally found high concentrations of metals, especially Zn, Cu and Pb, affected by anthropogenic inputs. Compared to the trace metal concentrations of uncontaminated stream sediments, arithmetic mean concentrations of roadside sediments were about 7 times higher for Cu, 4 times higher for Zn, 3 times higher for Pb and Cr and, 2 times higher for Ni and As. Speciation data on the basis of sequential extraction indicate that most of the trace metals considered do not occur in significant quantities in the exchangeable fraction, except for Cd and Ni whose exchangeable fractions are appreciable (average 29.3 and 25.8%, respectively). Other metals such as Zn (51.4%) and Pb (45.2%) are preferentially bound to the reducible fraction, and therefore they can be potentially released by a pH decrease and/or redox change. Copper is mainly found in the organic fraction, while Cd is highest in the exchangeable fraction, and Cr and Ni in the residual fraction. Considering the proportion of metals bound to the exchangeable and carbonate fractions, the comparative mobility of metals probably decreases in the order of Cd>Ni>Pb>Zn>Cr>Cu. Although the total concentration data showed that Zn was typically present in potentially harmful concentration levels, the data on metal partitioning indicated that Cd, Ni and Pb pose the highest potential hazard for runoff water. As potential changes of redox state and pH may remobilize the metals bound to carbonates, amorphous oxides, and/or organic matter, and may release and flush them through drain networks into the watershed of Hoidong Reservoir, careful monitoring of environmental conditions appears to be very important.
Keywords
Hoidong Reservoir; Roadside sediments; Metals; Contamination; Partitioning;
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