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GEOGRAPHICAL RESEARCH >

2014 , Vol. 33 >Issue 7: 1383 - 1392

DOI: https://doi.org/10.11821/dlyj201407017

Distribution and pollution of soil heavy metals in hilly upland around Pingdingshan coal mining area

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  • 1. College of Tourism and Environment, Shaanxi Normal University, Xi'an 710119, China;
    2. College of Resources and Environmental Science, Pingdingshan University, Pingdingshan 467000, Henan, China;
    3. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China

Received date: 2013-11-16

  Revised date: 2014-04-05

  Online published: 2014-07-10

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Abstract

An attempt was made to investigate the influence of mining activities upon the hilly upland soil around Pingdingshan coal mining area. Topsoil samples were collected from this area. Subsequently, the contents of five heavy metals, including Cu, Zn, Cr, Ni and Pb, were determined by means of the standard analysis methods of soil chemical composition. We analyzed their distribution characteristics at different altitudes and at different distances off the wind direct from the mining area, and evaluated the conditions of soil heavy metal pollution by adopting geo-accumulation index. The results are shown as follows. 1) The accumulations of heavy metals mentioned above were different from each other at different extents in the hilly upland soil around Pingdingshan coal mining area, in which Ni was the most significant, followed by Cr, Cu and Pb in turn. 2) The higher concentrations of five heavy metals at different altitudes were found in the mining zone, near slope bottom and slope top respectively. On the other hand, the highest concentrations were found within a distance of 50 m off the wind direct from the mining area, and contents of five heavy metals decreased as the distance increase. 3) Contents of Cu, Cr and Pb increase with the slope reduction, while the lowest contents of Zn and Ni were found in soils of slope from 5° to 15°. However, land use patterns showed no effects on the distributions of heavy metals in the upland soil around Pingdingshan coal mining area. Moreover, the contents of five heavy metals between forest land, grassland and arable land were not significantly different. 4) Cu, Zn, Cr, Ni and Pb pollutions were all found in the mining zone, and Cu, Ni and Pb pollutions were also found on the slopes below the mining zone, yet soils in slopes above the mining zone were only lightly polluted by Ni. Cu and Ni were the main pollution elements in downwind direction, with light to intermediate pollutions at different distances. Cr and Pb showed light pollutions within a distance of 50 m off the wind. Otherwise, Zn still kept clean in downwind direction. 5) Ni, Cu and Pb contaminations in the hilly upland soil around Pingdingshan coal mining area were caused mainly by human activities. In contrast, Zn and Cr were chiefly from natural sources.

Key words： upland soil; heavy metal; soil pollution; hilly; Pingdingshan coal mining area

Cite this article

CHU Chunjie, ZHOU Jinfeng . Distribution and pollution of soil heavy metals in hilly upland around Pingdingshan coal mining area[J]. GEOGRAPHICAL RESEARCH, 2014 , 33(7) : 1383 -1392 . DOI: 10.11821/dlyj201407017

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