生态环境学报Issue(3)：522-528,7.DOI:10.16258/j.cnki.1674-5906.2015.03.024
一个未开采的铅锌矿周边土壤重金属含量及生态安全评价
Heavy Metals Pollution and Eco-security Evaluation in the Surrounding Soil of An Untapped Lead-zinc Mining
摘要
Abstract
In order to comprehand the content and potential ecological risk of haavy metals in the surrounding soil of Jianbidong lead-zinc mining in Fengshun Guangdong, adopting the methods of field sampling and laboratory analysis test, regarding four different surface soil areas as analyzing case studies, the heavy metal contents (Pb、Zn、Cu、Cd、Cr、As) of the surrounding surface soil from the lead-zinc mining were determined.The analyzing methodologies include single factor evaluation, Nemerow comprehensive index method, evaluation of Hakanson potential ecological risk assessment and health risk assessment so that to assess the level and potential ecological risk of heavy metals from the soil. The result shows that: under the undeveloped situation of this lead-zinc mining, the soil around the mining area has occourred somewhat pollution of heavy metals, and most of the soil samples with Pb(average of 106.77 mg·kg-1), Cd(average of 0.27 mg·kg-1), Zn(average 55.75 mg·kg-1) from the four research areas were over the background value of Guangdong Province;The polluted index shows Pb(maximum value of 4.57), Cd(maximum value of 2.98), Zn(maximum value of 1.41) pollutions are the most common;Comprehensive index shows polluted degree of the soil of Laohuge paddy field area is the most serious and the value is accounting 3.47. Meanwhile, the number of the soil samples which have medium degree of pollution is equal 51.02% of the number of the whole;While the Hakanson potential ecological risk assessment indicated that the mining potential ecological risk at low level, the four area of potential ecological risk index (RI) was less than 150, the average value was 110.67, probably due to the fact that the mine area were still undeveloped, and influence of human activities is relatively weak,the potential ecological harm order of six kinds of heavy metals in the soil roughly was Cd>Pb>As>Cu>Zn>Cr, Cd (the contribution rate of 73.65%~79.67%) and Pb (the contribution rate of 10.24%~18.83%) were the main contribution of ecological risk factors; Health risk assessment of heavy metals also show that the non cancer, cancer risk is acceptable, four research area of non carcinogenic risk value and total heavy metal non carcinogenic risk and value are all less than 1, six kinds of heavy metals in three routes of exposure are embodied in the oral intake of > the skin intake of > the breath intake of, non carcinogenic risk value the size of the order of Pb>As>Cu>Zn>Cd>Cr.In summary, the fitting soil around the mining areas is sufferred from heavymetals pollution. The potential ecological risk is at a low level. The health risk is within the acceptable range, which is not similar to other recent lead-zinc mining area. In the following function of that area, research and prevention of heavy metal pollution should be paid more attention, and reasonable measures should be taken in order to prevent the intensification of the surrounding soil accumulation of heavy metals.关键词
铅锌矿/土壤/重金属/评价Key words
lead zinc mining/soil/heavy metals/evaluation分类
资源环境引用本文复制引用
张广胜,徐文彬,李俊翔,韦金莲..一个未开采的铅锌矿周边土壤重金属含量及生态安全评价[J].生态环境学报,2015,(3):522-528,7.基金项目
国家自然科学基金项目 （）
