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Abstract Based on the concentration of As, Cu, Cd, Cr, Co, Hg, Ni, Pb, V and Zn in sediment samples taken from 138 stations in Eastern Bohai Sea and Northern Yellow Sea, the distribution characteristics and controlling factors of heavy metals in marine sediment were studied. The average concentration of As, Cu, Cd, Cr, Co, Hg, Ni, Pb, V and Zn were 9.87, 20.1, 0.15, 58.9, 11.6, 0.02, 26.7, 23.0, 74.0 and 65.5 μg/g, respectively. Contents of Cu, V, Cr, Co, Ni and Zn showed a significantly positive correlation between organic carbon contents and the amount of fine-grained sediments (<63 μm) and its distribution in surface sediments was controlled obviously by the contents of organic matters and sediment grain sizes while As and Hg distribution was not significantly affected by the contents of organic matters and particle sizes of sediment. Enrichment factors (EF) were calculated to determine whether the observed concentration was higher than background levels. Three groups of elements: (1) Cr, Co, Ni, Pb, V and Zn were at background concentrations; (2) Cu was slightly enriched; and (3) As, Cd and Hg were moderately enriched. According to the Q-type cluster analysis, characteristics of the sediment in the study area could be divided into three different zones of heavy metal distribution. Class Ⅰ featured high Hg enriched sediment; As of Class II region was higher degree of enrichment; Class III region was higher for all heavy metal elements, especially Cu, Zn and Cd.
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Received: 22 January 2014
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CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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