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[1]WU Xianliang,HUANG Xianfei,LI Chaochan,et al.Soil Heavy Metal Pollution Degrees and Metal Chemical Forms Around the Coal Mining Area in Western Guizhou[J].Research of Soil and Water Conservation,2018,25(06):335-341.

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Soil Heavy Metal Pollution Degrees and Metal Chemical Forms Around the Coal Mining Area in Western Guizhou

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 06 Page number: 335-341 Column: Public date: 2018-10-26

Title:: Soil Heavy Metal Pollution Degrees and Metal Chemical Forms Around the Coal Mining Area in Western Guizhou

Author(s):: WU Xianliang¹, HUANG Xianfei¹, LI Chaochan¹, HU Jiwei¹, TANG Fenghua¹, ZHANG Zedong²; 1. Guizhou Provincial Key Laboratory Information System of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, Guiyang 550001, China;
2. Institute of China Karst, Guizhou Normal University, Guiyang 550001, China

Keywords:: coal mining area; heavy metals; potential ecological risk; index of geo-accumulation; modified grey clustering

CLC:: X53

DOI:: -

Abstract:: In order to investigate the soil heavy metal pollution and evaluate the potential ecological risk of the coal mining area in Qianxi, soil samples were collected in mining areas and non-mining area, respectively. Concentrations of heavy metals (Hg, Cd, As, Pb, Cr, Zn and Ni) in soil samples were determined. Meanwhile, the chemical forms of heavy metals were analyzed using Tessier’s sequential extraction procedure. The heavy metal risk in the study area was evaluated by the method of geo-accumulation index and the modified grey clustering. The result revealed that the average contents of Hg, Cd, As, Cr, Zn and Ni in coal mining areas were 3.37, 1.11, 1.50, 1.63, 1.23 and 1.73 times of the background values of Guizhou Province, respectively. The average contents of As and Hg in non-coal mining area were 2.37 and 1.83 times of the background values of Guizhou Province, respectively. The result from geo-accumulation index showed that the pollution of Hg and Cd was serious in the coal mining area, and Hg and As pollution was serious in non-mining areas. The results of the modified grey clustering showed that the other soils were polluted to different degrees except for the soil sample No. 3. Hg, Cd and As were primary contributors to the pollution in the study area, which is consistent with result from the method of geo-accumulation index. Cr, Cu and Zn mainly existed as residual fraction with high stability and low risk in the environment. In addition, Cd and Pb had the high environmental risk due to their high release ability. Great attention should be paid to Cd and Pb pollution.

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