外源有机酸对复垦土壤中重金属Cr的活化效果研究  

Effect of Exogenous Organic Acids on Activation of Heavy Metal Cr in Reclaimed Soil

作　　者：张治国[1,2,3] 谭雨柠 郑永红 李雅婷[1] 卢江伟 朱海东 周新伟 欧祥鹏 ZHANG Zhiguo;TAN Yuning;ZHENG Yonghong;LI Yating;LU Jiangwei;ZHU Haidong;ZHOU Xinwei;OU Xiangpeng(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,China;Anhui Engineering Laboratory for Comprehensive Utilization of Water and Soil Resources and Ecological Protection in Mining Area with High Groundwater Level,Huainan 232001,China;National Engineering Laboratory for Protection of Colliery Eco-environment,Huainan 232001,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]合肥综合性国家科学中心能源研究院(安徽省能源实验室),安徽合肥230031 [3]安徽省高潜水位矿区水土资源综合利用与生态保护工程实验室,安徽淮南232001 [4]煤矿生态环境保护国家工程实验室,安徽淮南232001

出　　处：《金属矿山》2024年第1期285-292,共8页Metal Mine

基　　金：国家自然科学基金项目(编号:51904014);“十三五”国家重点研发计划项目(编号:2020YFC1908601);安徽省博士后基金项目(编号:2019B337);合肥综合性国家科学中心能源研究院项目(编号:21KZS217)。

摘　　要：为了探究低分子有机酸(柠檬酸和苹果酸)对Cr污染土壤中Cr形态分布的影响,以淮南市潘一矿煤矸石山周边的复垦土壤为研究对象,通过模拟不同浓度Cr污染土壤,分析柠檬酸(CA)和苹果酸(MA)对土壤中Cr赋存形态的影响机制。结果表明:(1)随着外源Cr浓度的增加,土壤中Cr的活性有效提高。(2)柠檬酸和苹果酸的加入均可增加土壤中可交换态Cr的占比,即Cr的有效性得到提高,且随着柠檬酸和苹果酸浓度的升高,对土壤中Cr活化效果持续上升,柠檬酸的活化效果优于苹果酸。(3)随着老化时间的延长,有机酸对Cr的活化效果会减弱,弱结合态Cr将逐渐向强结合态Cr转化。因此,土壤重金属Cr污染修复中,可以考虑选用活化效果较好的柠檬酸作为修复辅助剂,来提升土壤Cr修复效率。研究结果可为矿区复垦土壤重金属Cr污染修复提供指导。In order to explore the effects of low molecular organic acids(citric acid and malic acid)on the form distribu-tion of Cr in different chromium polluted soils,the reclaimed soil around the coal gangue hill of Panyi Mine in Huainan City was taken as the research object.By simulating the soil polluted by different concentrations of Cr,the influence mechanism of citric acid(CA)and malic acid(MA)on the occurrence form of Cr in soil was analyzed.The results showed that:①With the increase of exogenous Cr concentration,the activity of Cr in soil increased effectively.②The addition of citric acid and malic acid increased the content of exchangeable Cr in soil,that is,the effectiveness of Cr increased.With the increase of citric acid and malic acid concentration,the activation effect of citric acid on Cr in soil continued to increase,and the activation effect of citric acid was better than malic acid.③With the extension of aging time,the activation effect of organic acids on Cr will weaken,and the weakly bound Cr will gradually transform into strongly bound Cr.Therefore,in the remediation of soil heavy metal Cr pollution,citric acid with good activation effect could be considered as a remediation assistant to improve the efficien-cy of soil remediation.

关 键 词：铬污染 柠檬酸 苹果酸 赋存形态 污染修复 

分 类 号：X53[环境科学与工程—环境工程]