摘要
随着工矿业、农业的发展,许多国家和地区都已发现重金属污染问题,掌握土壤重金属的来源情况对于维护生态安全十分必要。本文对三里岗镇八种重金属元素进行了含量分析和半变异函数分析,并通过正定矩阵因子分解法结合源贡献率空间分布特征探究了土壤中8种重金属元素的来源。结果表明:As、Cd、Cr、Cu、Ni和Zn的土壤含量均超出全国背景值,内梅罗综合污染指数均值为0.73,说明研究区整体处于尚清洁水平。半变异函数分析显示8种重金属元素更多受到结构性因素的影响。PMF源解析所得到的4个来源分别解释为震旦系和白垩系地层母岩的影响、元古界地层与乡村道路交通排放的混合源、震旦系和寒武系地层母岩的影响以及奥陶系到志留系地层母岩的影响,说明自然源是研究区重金属的主要来源。此外,本文研究结果表明PMF模型在重金属源解析工作中可以发挥十分重要的作用。
With the development of industry, mining and agriculture, heavy metal pollution has been found in many countries and regions of the world.It is necessary to master the sources of soil heavy metals for maintaining ecological security.In this paper, eight heavy metals in Sanligang town were analyzed by content analysis and semi-variogram analysis, and the sources of these eight heavy metals in soil were explored by positive matrix factor(PMF)decomposition combined with spatial distribution characteristics of source contribution rate.The results showed that the soil contents of As, Cd, Cr, Cu, Ni and Zn exceeded the national background value, and the average value of Nemerow comprehensive pollution index is 0.73,indicating that the study area is still at a clean level.Semi-variogram analysis showed that these eight heavy metals were more affected by structural factors.The four sources obtained by PMF source analysis are interpreted as the influence of the rocks in Sinian and Cretaceous, the mixed source of Proterozoic strata and rural road traffic emissions, the influence of the rocks in the Sinian and the Cambrian and the influence of the rocks in the Ordovician to the Silurian, indicating that the natural origins are the most important contributors of heavy metals in this region.Furthermore, the study shows that the PMF model can play a very important role in the source apportionment of heavy metals.
作者
董健彪
谢淑云
田欢
杨文兵
李华
周徐维
Diego Armando Pinzon Nunez
DONG Jian-biao;XIE Shu-yun;TIAN Huan;YANG Wen-bing;LI Hua;ZHOU Xu-wei;Diego Armando Pinzon Nunez(School of Earth Science,China University of Geoscience,Wuhan 430074,Hubei,China;Faculty of Materials Science and Chemistry,China University of Geoscience,Wuhan 430074,Hubei,China;Eighth Geological Brigade of Hubei,Xiangyang 441002,Hubei,China;Qinghai Geological Survey,Xining 810000,Qinghai,China)
出处
《贵州地质》
2022年第4期404-413,共10页
Guizhou Geology
基金
湖北省地质局第八地质大队和“金土地”工程-高标准基本农田地球化学调查课题(项目编号HBJTD20140108)
中国地质大学(武汉)中央高校基金生态地球化学团队项目(CUG170104)。
关键词
湖北随县
土壤重金属
半变异函数
正定矩阵因子分解法
源解析
Sui county in Hubei province
Soil heavy metal
Semi-variogram function
Positive matrix factorization(PMF)
Source appointment
