摘要
煤矸石地表堆放常会造成周围耕作层土壤的重金属污染,且这种污染可为植物所富集,并通过食物链危害人类健康。本文以陕西白水煤矿为例,通过对煤矸石及其周围耕作层土壤中Cr,Cu,Cd,Zn 4种重金属全量和有效态含量的测定,研究了煤矸石堆放对周边耕作层中重金属含量的影响。研究表明:矸石样与土样中四种重金属的含量均高于当地的土壤本底值,煤矸石的堆放使得周边耕作层受到了不同程度的重金属污染;随着距矸石堆距离的增大,土壤中重金属含量逐渐减小,且下风向区域重金属含量高于等距离的上风向区域;在四种重金属元素中,Cd的有效态含量占全量的比率最高,具有最强的活性,最易于被植物吸收,其污染风险也最大。
Coal gangue piles can cause surrounding farming soil polluted by heavy metals, and the pollutants would be enriched by plants and finally endanger human＇s health through the food chain.Taking Shaanxi Baishui Mine as an example, the authors have done research on the impact of coal gangue pile on the concentration of heavy metals in farming soil by determining the total content and effective content of four heavy metals Cr, Cu, Cd and Zn both in gangue and surrounding fanning soil. The results show that the content of four heavy metals both in gangue samples and soil samples is higher than the local background value of soil, the coal gangue pile maks the surrounding soil poiluted in varied degrees;with the distance from the coal gangue pile increasing, the concentration of heavy metals in soil reduces gradually, and the pollution in downwind region is more serious than the region in the same diatance against the wind ; of the four heavy metals, the ratio of effective content of Cd to total content is the highest, which proves that Cd is the most active element, and it can be absorbed easily by plants, also its potential for pollution is the biggest.
出处
《西安科技大学学报》
CAS
北大核心
2008年第3期489-492,共4页
Journal of Xi’an University of Science and Technology
基金
陕西省自然科学基金项目(2007D09)
关键词
煤矸石
耕作层土壤
重金属污染
coal gangue
farming soil
heavy metal pollution
