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Abstract During August 1~15, 2011, 51 surface water samples were collected from the northern slope of Tianshan Mountains. Contents of ten heavy metals, i.e., Pb, Ni, Cd, Co, Hg, As, Cu, Mn, Zn and Cr were tested in the laboratory by using ICP-MS. The statistical methods, such as correlation analysis, principal component analysis and cluster analysis were then employed to identify the sources of these heavy metals. contents of 10 heavy metals ranged from 0 to 91.876 μg/L. The order of heavy metals in the same samples was: Ni>As>Cu>Zn>Co>Mn>Hg>Cd>Pb. The correlation analysis shows a closer correlation between Cu, Mn, Hg, Zn, Ni and other elements. The principal component analysis shows that heavy metals in the samples can be divided into the first principal component of Cu, Ni, Cr, Cd, As, Co and Cr, which comes from the natural weathering erosion of the bed parent rock and granular minerals at the bottom and bank of the river and stream; the second principal component includes Mn, Hg, Zn, Pb, indicating a source from factories and traffics; and the third principal component of Hg, Pb and Cr, which comes from industrial and agriculture pollution. These heavy metals can be classified into four clusters, i.e., cluster one (Co, Ni, Cr), cluster two (Cd, Cu), cluster three (Pb, Zn, Mn) and cluster four (Hg).
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Received: 03 February 2012
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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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