GLDA螯合态重金属在某农田下包气带土层中的吸附特性  

Adsorption Characteristics of GLDA Chelated Heavy Metals in Soils of Lower Vadose Zone

作　　者：刘国威[1] 黄思彬 杨晓雯 谢镇宇 黄丽婷 张卓楠 罗定贵[1,2,3,4] Liu Guowei;Huang Sibin;Yang Xiaowen;Xie Zhenyu;Huang Liting;Zhang Zhuonan;Luo Dinggui(School of Environmental Science and Engineering,Guangzhou University,Guangzhou 510006;Link?ping University-Guangzhou University Research Center on Urban Sustainable Development,Guangzhou University,Guangzhou 510006;Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources,Guangzhou University,Guangzhou 510006;Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学环境科学与工程学院,广东广州510006 [2]广州大学—林雪平大学城市可持续发展研究中心,广东广州510006 [3]广东省放射性核素污染控制与资源化重点实验室广州大学,广东广州510006 [4]珠江三角洲水质安全与保护教育部重点实验室广州大学,广东广州510006

出　　处：《广东化工》2020年第4期18-20,共3页Guangdong Chemical Industry

基　　金：国家自然科学基金(41372248,41807463,41807193,41301348);广州市科技项目(201607010286);国家自然科学基金委员会-贵州省人民政府喀斯特科学研究中心项目(U1612442);大学生创新训练项目(S201911078083)。

摘　　要：本试验选择典型可降解螯合剂GLDA,并与不可降解螯合剂EDTA形成的螯合态重金属(Pb、Cd)进行某农田下包气带土层的吸附实验,为评估螯合强化植物提取土壤修复所形成的螯合态重金属下渗迁移带来的地下水污染风险提供评价依据。结果为:螯合态重金属(Pb、Cd)的吸附量显著低于空白对照组,吸附量大小表现为CK>GLDA>EDTA,且螯合态Pb的吸附量大于Cd,表明螯合强化植物提取将加剧螯合态重金属的渗漏,且EDTA螯合态重金属的渗漏风险大于GLDA。In this experiment, a chelated heavy metal(Pb, Cd) is formed by a typical biodegradable chelating agent GLDA and a non-biodegradable chelating agent EDTA, which is selected to perform an adsorption experiment on lower vadose zone soil under a farm. These results provide an evaluation basis for assessing the risk of groundwater pollution caused by infiltration and migration of chelated heavy metals formed by chelation-enhanced phytoremediation. These results show that the adsorption amount of chelated heavy metals(Pb, Cd) is significantly lower than that of the blank control group, and the adsorption amount is CK>GLDA>EDTA, In addition, the adsorption amount of chelated Pb is greater than Cd, which indicates that chelated enhanced phytoremediation will increase the leakage of chelated heavy metals, and the leakage risk of EDTA chelated heavy metals is greater than GLDA.

关 键 词：下包气带 地下水污染风险 EDTA GLDA 

分 类 号：TQ[化学工程]