摘要
以关中西部某铅锌厂周边农田为对象,研究了厂区周边土壤中7种重金属含量的水平及垂直分布特征,用Lars Hakanson潜在生态危害指数对重金属的危害程度进行了评价。研究表明,厂区周围土壤中重金属在水平分布上具有局部高度富集的特征。以厂区为中心,重金属水平分布主要在西北-东南方向上,地势低的土壤中重金属含量明显较高;重金属在垂直分布上主要富集在0~25 cm的表层土壤中,且随着深度的进一步增加,土壤中重金属浓度变化幅度减弱,基本趋于稳定。厂区周边Cd和Hg污染水平为重度污染,Pb污染水平为中度污染,潜在生态危害程度为重度。
The agricultural soil around a lead and zinc smelter in Midwest Shaanxi was taken as the research object and the horizontal and vertical distribution characteristics of seven types of heavy metals were investigated. The Lars Hakanson potential ecological harm index was used to evaluate the hazard degree of these metals to the environment. The results show that these heavy metals have characteristics of local high concentration around the plant. The heavy metals mainly distribute in the Northwest-Southeast direction of the factory and the contents are high in low-lying soil. For the distribution in vertical direction,heavy metals are enriched in the 0 ~25 cm in the surface soil. The variation of concentration decreases when depth increase and tends to be stable. In the soil surrounding the plant,the pollution level of Cd and Hg is severe and the pollution level of Pb is moderate. The potential ecological hazard degree is severe.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第1期477-484,共8页
Chinese Journal of Environmental Engineering
基金
环保公益性行业科研专项(201109053)
陕西省软科学重点项目(2014KRM16)
陕西省重点学科建设专项资金资助项目(E08001)
关键词
重金属
土壤
空间分布
生态风险评价
heavy metal
soil
spatial distribution
ecological risk assessment
