生态环境学报Issue(5)：879-885,7.DOI:10.16258/j.cnki.1674-5906.2015.05.024
贵州万山汞矿周边土壤重金属污染特征及风险评价
Contaminant Characteristics and Risk Assessment of Heavy Metals in Soils from Wanshan Mercury Mine Area, Guizhou Province
摘要
Abstract
Mineral resources are abundant in Guizhou Province, China. With the development of anthropogenic activity for mine exploiting and smelting, the problem of heavy metal pollution was becoming more and more obvious. In order to investigate the adverse effects on environment quality, thirty soil samples were collected randomly from Wanshan mercury mine area after its shut down. Heavy metals (Cr, Ni, Cu, Cd, Pb, As and Hg) in all soil samples were determined by inductively coupled plasma mass spectrometry and atomic fluorescence spectrophotometer after pretreatment of wet digestion method. Pollution characteristics of heavy metals in soils were observed on the basis of background values of single factor pollution index method and comprehensive pollution index method. Potential ecological risk assessment was evaluated by using the geoaccumulation index (Igeo) and potential ecological risk index (RI). The results indicated that the soil samples around mercury mining area had been seriously contaminated by mercury. The average concentrations of Cr, Ni, Cu, Cd, Pb, As and Hg were 353.22, 33.58, 41.45, 0.87, 59.30, 14.34 and 14.15 mg·kg-1, respectively. According to Environmental Quality Standard for Soil, the concentration of Hg was highest, more than 135 times. According to the geoaccumulation index, the pollution degree of Cr was middle degree with Igeos of Cr for 1 and 2, and Hg ranged from high to light degree with Igeos of Hg for 4 and 10. The potential ecological risk index indicated that the heavy metals in the soils from Wanshan mercury mine area were at the moderate ecological hazard level. The rate of contribution for Hg was highest to potential ecological risk index. Principle component analysis (PCA) showed that Cr, Ni and Cu in soils of Wanshan mercury mine area were possibly from environmental background value;and the sources of Cd, Pb, As, and Hg were relate to anthropogenic factors, such as atmospheric deposition, exploitation and smelting of mercury mine and so on.关键词
汞矿区/土壤/重金属/污染特征/风险评价Key words
mercury mining area/soils/heavy metals/contaminant characteristics/risk assessment分类
资源环境引用本文复制引用
胡国成,黎华寿,张丽娟,齐剑英,杨剑,于云江,郑海,陈凤,陈棉彪,王程程..贵州万山汞矿周边土壤重金属污染特征及风险评价[J].生态环境学报,2015,(5):879-885,7.基金项目
2013年国家环保公益性行业科研专项项目 （）
