不同螯合剂和有机酸对苍耳修复镉砷复合污染土壤的影响  

Effect of Chelating Agents and Organic Acids on Remediation of Cadmium and Arsenic Complex Contaminated Soil Using Xanthium sibiricum

作　　者：张雅睿 黄益宗 保琼莉 魏祥东[2] 铁柏清[2] 张盛楠 韩廿 黄永春 ZHANG Ya-rui;HUANG Yi-zong;BAO Qiong-li;WEI Xiang-dong;TIE Bai-qing;ZHANG Sheng-nan;HAN Nian;HUANG Yong-chun(Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,Tianjin 300191,China;College of Resources and Environment,Hunan Agricultural University,Changsha 410128,China)

机构地区：[1]农业农村部环境保护科研监测所,天津300191 [2]湖南农业大学资源环境学院,长沙410128

出　　处：《环境科学》2022年第8期4292-4300,共9页Environmental Science

基　　金：国家重点研发计划项目(2020YFC1808702,2017YFD0801500)。

摘　　要：为了提高苍耳对农田Cd和As污染的修复效率,探究了不同螯合剂和有机酸(EDTA、SAP、CA和MA)对苍耳提取农田土壤Cd和As的影响.结果表明,施用4种不同螯合剂和有机酸对苍耳的根、茎和叶生物量影响不大.不同螯合剂和有机酸对苍耳各器官Cd和As含量和积累量影响不同.与CK处理相比,施用EDTA、SAP、CA和MA均显著提高了苍耳叶部的Cd含量,增幅分别是44.1%、32.4%、41.2%和38.2%,苍耳根系As含量分别提高89.6%、7.4%、94.8%和61.5%.施用EDTA、SAP、CA和MA处理使苍耳植株总Cd积累量分别比CK处理提高70.2%、29.4%、28.9%和33.1%,而As积累量分别提高67.0%、19.6%、81.9%和40.8%.施用螯合剂和有机酸对苍耳各器官Cd和As的富集系数和转运系数也有不同影响.4种螯合剂和有机酸处理对根际土壤Cd和As含量影响均比较显著,与对照相比降幅分别是32.7%~38.2%和14.6%~20.5%.4种螯合剂和有机酸均可以提高苍耳提取农田土壤Cd和As的效率.In order to improve the phytoextraction efficiency of Xanthium sibiricum on farmland soil that had been contaminated by Cd and As,this study explored the effects of chelating agents and organic acids(EDTA,SAP,CA,and MA) on the extraction of Cd and As heavy metals using X.sibiricum.The results showed that the four different chelating agents and organic acids had little effect on the biomass of the roots,stems,and leaves of X.sibiricum.However,they had different effects on the concentrations and accumulation of Cd and As in various organs of X.sibiricum.Compared with the those in the CK treatment,EDTA,SAP,CA,and MA significantly increased the Cd concentrations in the leaves of X.sibiricum by 44.1%,32.4%,41.2%,and 38.2% and the As concentrations in the roots of X.sibiricum by 89.6%,7.4%,94.8%,and 61.5%,respectively.The four treatments(EDTA,SAP,CA,and MA) improved the total Cd accumulation of X.sibiricum,with increasing ranges,respectively,of 70.2%,29.4%,28.9%,and 33.1%,and the As accumulation increased by 67.0%,19.6%,81.9%,and 40.8%,respectively,compared with that of the CK treatment.The four chelating agents and organic acids had different effects on the Cd and As bioconcentration factor and transfer factor of various organs of X.sibiricum.Treatments with EDTA,SAP,CA,and MA resulted in a decrease of 32.7%-38.2% in soil Cd concentrations and a decrease of 14.6%-20.5% in soil As concentrations.These four chelating agents can be used for enhancing the efficiency of extraction Cd and As heavy metals by X.sibiricum.

关 键 词：农田 重金属 苍耳 螯合剂 植物修复 萃取技术 

分 类 号：X171.5[环境科学与工程—环境科学]