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模拟酸雨对稀土矿区铅污染农田的淋滤效应
胡方洁1, 刘祖文2, 张军2, 杨秀英2, 卢陈彬2
1.江西理工大学 资源与环境工程学院, 江西 赣州 341000;2.江西理工大学 建筑与测绘工程学院, 江西 赣州 341000
摘要:
[目的]针对赣南稀土矿区周边农田存在严重的重金属铅污染情况,研究该地区农田土壤中重金属铅迁移转化规律,旨在为矿区铅污染治理提供依据。[方法]采用模拟酸雨淋滤试验土柱观察重金属铅的淋出量变化,结合响应曲面分析试验结果。[结果]随时间的推移,铅淋出量呈现出快速下降和慢速下降两个阶段。随着pH值的减小,淋滤强度的上升使得铅淋出量呈现先上升后减小的情况。当外源铅浓度增加时,pH值的减小和淋滤强度的上升都会时铅淋出量增加。响应曲面软件对试验数据进行多元回归拟合,交互项中pH值与培养铅浓度较为显著。[结论]铅的污染程度与铅的析出呈正相关,酸雨pH值对污染农田中铅的析出有重要影响。
关键词:  模拟酸雨  农田土壤  铅污染  降雨强度  迁移特征
DOI:10.13961/j.cnki.stbctb.2019.03.028
分类号:X53
基金项目:国家自然科学基金项目“离子型稀土矿区土壤中氮化物迁移规律及转化机理研究”(51464014)
Leaching Effects of Lead-contaminated Farmland by Simulated Acid Rain
Hu Fangjie1, Liu Zuwen2, Zhang Jun2, Yang Xiuying2, Lu Chenbin2
1.School of Resources and Environmental Engineering, Ganzhou, Jiangxi 341000, China;2.School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China
Abstract:
[Objective] Due to the serious heavy metal lead pollution in the farmland around the rare earth mining area in Southern Jiangxi Province, we aim to study the migration and transformation of heavy metal lead in the farmland soil in this area in order to provide a basis for lead pollution control in mining area.[Methods] The leaching amount of heavy metal lead was observed by simulated acid rain leaching experiment, and the experimental results were analyzed by response surface methodology.[Results] As the leaching amount of lead increased with time, it showed two stages of rapid and slow decline. With the decrease of pH value, the leaching amount of lead increased first and then decreased with the increasing of leaching intensity. When the concentration of exogenous lead increased, the leaching amount increased with the decrease of pH value and the increase of leaching intensity. Response surface software was used to fit the experimental data by multiple regression. The pH value and concentration of lead in culture were significant in the interaction term.[Conclusion] The degree of lead pollution was positively correlated with the release of lead. The pH value of acid rain had an important influence on the release of lead in contaminated farmland.
Key words:  simulated acid rain  farmland soil  Pb pollution  rainfall intensity  migration characteristics