摘要
对什邡市两家磷化工厂的磷石膏和磷石膏堆周围土壤中Zn、Cd、As、Cu、Pb、Hg和U的含量及空间分布特征进行了检测和分析,根据重金属含量对土壤环境质量进行评价,并结合研究区地形地貌、气候特征研究重金属分布和来源。结果表明:磷石膏中重金属的含量较高,磷石膏的堆放使得磷石膏中的重金属在周边耕作层土壤中形成了较大的累积;9个土样中,各元素的检出率均为100%,Cd、Cu、Zn和Pb的含量最高,Cd的最高含量超土壤三级标准近3倍,Cu和Zn平均含量超过了土壤二级标准;磷石膏堆周围土壤中重金属含量在平面上与磷石膏堆距离成负相关,在纵向剖面上,重金属含量也基本上随着深度的增加而降低,各元素含量下降的程度不一样,Cd和Pb的下降程度最大。
The contents and spatial distribution of Zn, Cd, As, Cu, Pb, Hg and U in soil around the phosphogypsum piles and in the phosphogypsum of two phosphorus chemical factories in Shifang city were studied, and pollution status of heavy metals on the soil environment was evaluated. Topography and climatic characteristics in the research area were used to study the distribution and source of heavy metals. The results show that： the contents of heavy metals were higher in phosphogypsum ,and the phosphogypsum stacking made the heavy metals enriched in the surrounding farming soil.Among the 9 soil samples, the detection rate of each element was both 100%, and the contents of Cd. Cu. Zn and Pb were highest.The maximum content of Cd was 3 times of the third soil standard, and the average contents of Cu and Zn were above the secondary soil standard; the contents of heavy metals in soil around the phosphogypsum piles correlated negatively with the distance of phosphogypsum piles on the plane,and on the longitudinal section with the depth increasing the contents of heavy metals were also generally reduce. The extent of decline in each element was not the same,and the drops of Cd and Pb were greatest.
出处
《中国非金属矿工业导刊》
2010年第5期52-55,共4页
China Non-Metallic Minerals industry
基金
国家环保部和中国地质调查局联合资助(200314200015)
关键词
磷石膏
土壤
重金属
phosphogypsum
soil
heavy metal
