化学浸提剂对土壤团聚体结构稳定性的影响  

Effects of chemical leaching agent on structural stability of soil aggregates

作　　者：朵雯佳 谢更新[1,2] 丁文川 晏卓逸[1,2] 李桥 米瑞冬 DUO Wenjia;XIE Gengxin;DING Wenchuan;YAN Zhuoyi;LI Qiao;MI Ruidong(College of Environment and Ecology,Chongqing University,Chongqing 400045;Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045;Power China Chengdu Engineering Corporation Limited,Chengdu Sichuan 610072)

机构地区：[1]重庆大学环境与生态学院,重庆400045 [2]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [3]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《环境污染与防治》2021年第11期1374-1378,1382,共6页Environmental Pollution & Control

基　　金：重庆市技术创新与应用发展专项(No.cstc2019jscx-msxmX0158);重庆大学大型仪器设备开放基金资助项目(No.202003150091)。

摘　　要：为探究不同化学浸提剂对土壤结构的破坏机制,考察了化学浸提剂(乙二胺四乙酸二钠(EDTA)、柠檬酸和FeCl_(3))浸提Pb/Cd复合污染土壤后不同粒径土壤团聚体中有机碳、游离氧化铁/氧化铝、总氮及碳氮质量比(C/N)的变化。结果表明:化学浸提剂会改变不同粒径土壤团聚体中游离氧化铁/氧化铝、有机碳、总氮及C/N,影响土壤结构;化学浸提剂对粒径0.25~<2.00、<0.05 mm的土壤团聚体中伊利石和高岭石的晶体存在一定的破坏;相比EDTA和柠檬酸,FeCl_(3)浸提对团聚体破坏程度较小,利于保持土壤结构稳定,从而利于修复后土壤的再利用。To explore the damage mechanism of soil structure with chemical agents leaching,the variations of organic carbon,free iron oxide/alumina,total nitrogen and carbon nitrogen mass ratio(C/N)of soil aggregates in Pb/Cd polluted soil were investigated after soil leaching with chemical leaching agents(EDTA,citric acid and FeCl_(3)).The results showed that chemical leaching agents could change free iron oxide/alumina,organic carbon,total nitrogen and C/N in soil aggregates with different particle sizes,and affect soil structure.Chemical leaching agents could destroy the crystals of illite and kaolinite in soil aggregates with particle sizes of 0.25-<2.00,<0.05 mm.FeCl_(3) had less damage to aggregates in comparison with EDTA and citric acid,which was conducive to maintain soil structure stable and reuse the soil after remediation.

关 键 词：化学浸提 团聚体 土壤质量 重金属污染 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]