Fractionation of heavy metals in sediment cores from the Ell-Ren River,Taiwan |
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| Affiliation: | 1. Irstea, UR HHLY, Hydrology-Hydraulics, 5 rue de la Doua, CS 70077, F-69626 Villeurbanne, France;2. Irstea, UR MALY, Freshwater Systems Ecology and Pollution, 5 rue de la Doua, CS 70077, F-69626 Villeurbanne, France;1. Key Laboratory for Basic Pharmacology of Ministry of Health, Zunyi Medical College, China;2. Medical Research Center, Zunyi Medical College, Zunyi, China;3. Northwest Plateau Institute of Biology of Chinese Academy of Sciences, Xining, China;1. Department of Civil Engineering, Inje University, 197 Inje-ro, Gimhae, Gyeongnam 621-749, South Korea;2. Department of Environmental Science and Engineering, Inje University, 197 Inje-ro, Gimhae, Gyeongnam 621-749, South Korea;3. Division of Civil Engineering, University of Dundee, Perth Road, Dundee DD5 3LE, UK;1. College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China;2. North China Electric Power Research Institute Co Ltd., Beijing, 100045, China;1. Department of Irrigation & Hydraulics, Faculty of Engineering, Cairo University, Giza, Egypt;2. School of Engineering, University of Guelph, Guelph, Ontario NIG 2 W1, Canada;1. Civil Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran;2. Dept. of Chemical and Environmental Engineering, University of Arizona, P.O. Box 210011, Tucson, AZ, USA;3. National University of Singapore, NUS Environmental Research Institute (NERI), 5 A Engineering Drive 1, T-Lab Building, #02-01, Singapore 117411, Singapore;4. Department of Veterinary Biomedical Sciences and Toxicological Center, University of Saskatchewan, Saskatoon, Saskatchewan, Canada |
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| Abstract: | Fractionation of heavy metals (Cr, Cu, Co, Zn, Ni, and Pb) in sediment cores taken from three heavily polluted locations of the Ell-Ren River in southern Taiwan was studied. After the three sediment cores were separated into several depth sections, sequential extraction procedure was used to determine the variations in heavy metal binding fractions (exchangeable, bound to carbonates, bound to Mn oxides, bound to Fe oxides, and bound to organic matter) with different sediment depth, and followed by multivariate analyses. It turns out that a deeper sediment depth tended to result in smaller amounts of total extractable heavy metals (TEHMs), indicating that heavy metal pollution of the river has been intensifying these years. The decreasing order of TEHMs was: Zn > Cu > Pb > Cr > Ni > Co. The TEHMs Zn and Cu detected from different depth of the three sediment cores were mainly originated from “bound to carbonates” and “bound to organic matter” fractions, respectively. Also, the percentages of the heavy metals contained in each of the five binding fractons only slightly varied with sediment depth. From multivariate analyses, all the heavy metals except Co behaved similarly and might be discharged from the same pollution sources. |
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