Pb在饱水带-包气带的垂向迁移试验研究  

Experimental Study on the Vertical Migration of Pb from the Saturated Zone to Unsaturated Zone

作　　者：吴众然 刘桂建[2] 钱家忠 魏勇 岳琼申 WU Zhongran;LIU Guijian;QIAN Jiazhong;WEI Yong;YUE Qiongshen(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230000,China;School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]合肥丁业大学资源与环境工程学院,安徽合肥230000 [2]中国科学技术大学地球和空间科学学院,安徽合肥230026

出　　处：《环境科学与技术》2019年第9期36-41,共6页Environmental Science & Technology

基　　金：国家自然科学基金资助项目（41173032）;安徽省重点研究开发计划资助项目（1804b06020358）;安徽重点研究和开发计划资助项目（1804a0802198）

摘　　要：文章采用黏土和砂土样品,通过饱水带-包气带土柱试验,利用颗粒分析、ICP-MS、XRD等手段,研究了从毛细水上升高度对应的时间和土壤含水率,试验前后Pb含量变化,以及土壤粒径与Pb的垂向迁移特征。结果表明,随着毛细水上升高度增加,含水率逐渐降低且所用时间增加。粒度分布集中,径距小,Pb背景值高的黏土试验后Pb含量显著下降;粒度宽,径距大,Pb背景值低的砂土试验后Pb含量则相对升高。黏土和砂土试验前后Pb含量的变化受采样点周边环境、矿物组成的差异和试验条件的影响。Basing on the saturated zone-unsturated zone water tank experiments, the vertical migration of Pb in clay and sand was studied. Using the ICP-MS, XRD, and particle analysis, the time and soil moisture content corresponding to the rising height of capillary water, as well as the variation of Pb contents and the soil particle size were analysed. The results indicated that the reduction of soil moisture content and the raise of the time with the rising height of capillary water column. The Pb content of sandy, with concentrated particle size distribution as well as small diameter and high background value of Pb content, significantly decreased after the experiment. However, the Pb content of clay with wide grain size, large diameter spacing and low background value of Pb content, relatively increased. By analyzing the Pb content difference between clay and sand before and after the test, we found that the difference was caused by geological environment and mineral crystal structure.

关 键 词：铅 土壤 饱水带 包气带 毛细水 

分 类 号：X131.3[环境科学与工程—环境科学]