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.
黔西煤矿区土壤重金属污染水平及其形态
- Title:
- Soil Heavy Metal Pollution Degrees and Metal Chemical Forms Around the Coal Mining Area in Western Guizhou
- Keywords:
- coal mining area; heavy metals; potential ecological risk; index of geo-accumulation; modified grey clustering
- 分类号:
- X53
- 摘要:
- 为研究黔西煤矿区周边土壤重金属污染情况及其潜在生态环境危害，分别在黔西煤矿区及非矿区进行了土壤样品采集，分析了研究区土壤重金属（Hg，Cd，As，Pb，Cr，Zn，Ni）污染水平，并采用了改进的Tessier法对重金属形态进行分析，应用地累积指数法及改性灰色聚类法进行了重金属风险评价。结果显示：煤矿区Hg，Cd，As，Cr，Zn及Ni平均值含量分别是贵州省背景值的3.37，1.11，1.50，1.63，1.23，1.73倍；非煤矿区As和Hg平均值含量分别是贵州省背景值的2.37，1.83倍。煤矿区受Hg及Cd污染较严重，而非煤矿区Hg和As污染也较为严重。研究区除3号样点外，其他样点均受到不同程度的污染；Hg，Cd及As为研究区污染贡献最大的3个因素，这与地累积指数法评价结果一致。研究区Cr，Cu及Zn以残渣态为主，稳定性较高，对环境影响最低；Cd及Pb非残渣态比例较高，对环境潜在危害较大，应当高度重视研究区Cd及Pb污染。
- 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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备注/Memo
收稿日期:2017-12-19;改回日期:2018-02-12。
基金项目:贵州省林业厅项目（黔林科合[2016]09）；贵州省科技厅联合基金（LH[2016]7203）；国家111项目（D17016）
作者简介:吴先亮(1995-),男(侗族),贵州黎平人,在读硕士研究生,研究方向为环境分析化学。E-mail:wuxianliang1995@163.com
通讯作者:黄先飞(1983-),男,贵州遵义人,助理研究员,博士,主要从事环境科学研究。E-mail:hxfswjs@gznu.edu.cn