膨润土、褐煤及其混合添加对铅、镉复合污染土壤重金属形态的影响  

Fractionation of Heavy Metals in Cd/Pb Contaminated Soil Amended with Bentonite and Lignite

作　　者：化党领[1] 朱利楠 赵永芹 杨秋云[2] 张静静[1] 杨金康 HUA Dang-ling;ZHU Li-nan;ZHAO Yong-qin;YANG Qiu-yun;ZHANG Jing-jing;YANG Jin-kang(College of Resources and Environment,Henan Agricultural University,Zhengzhou 450000,China;College of Agronomy,Henan Agricultural University,Zhengzhou 450000,China)

机构地区：[1]河南农业大学资源与环境学院,河南郑州450000 [2]河南农业大学农学院,河南郑州450000

出　　处：《土壤通报》2020年第1期201-206,共6页Chinese Journal of Soil Science

基　　金：国家重点研发计划项目(2018YFD0800300);国家自然科学基金项目(41371311);河南省教育厅项目(18B210009);河南农业大学博士科研启动项目(30601643)资助。

摘　　要：为研究膨润土与褐煤对铅镉复合污染土壤重金属形态变化的影响,以河南济源某铅冶炼企业周边重金属污染土壤为研究材料,将膨润土(S)、褐煤(P)按1.5%、3.0%、5.0%单独添加和两者混合添加,进行60天的室内培养后,用BCR连续提取法,研究了添加不同含量的膨润土和褐煤对重金属污染土壤中Pb、Cd形态的影响。结果表明,单一添加褐煤能显著降低土壤中Pb、Cd的有效态含量,褐煤添加量5.0%时土壤中铅和镉弱酸提取态含量分别降低了42.60%和25.20%。单一添加膨润土能显著降低土壤中Pb的有效态含量,而对Cd的有效态含量影响不明显。膨润土5.0%和褐煤(1.5%、3.0%、5.0%)混合处理土壤中铅的弱酸提取态含量降幅达44.50%~46.00%,铅的残渣态含量增幅达30.90%~66.80%。褐煤5.0%和膨润土(1.5%、3.0%、5.0%)的混合添加使土壤中镉的弱酸提取态含量降低、降幅达21.70%~26.00%,镉的残渣态含量增幅达81.60%~110.9%。褐煤单一施用对复合污染土壤中Pb、Cd的钝化效果整体优于膨润土,两者配施的修复效果优于其中一种单一施用的效果,且因配施比例而异。Pot experiments were conducted to investigate the effects of bentonite(S)and lignite(P)addition on heavy metal fractionation in a Cd/Pb contaminated soil in Jiyuan,Henan Province.Bentonite and lignite were added with the percentage of 1.5%,3.0%and 5.0%,and were mixed for combined application.The chemical speciations of heavy metals in soil were sequentially extracted by the way of BCR(European Community Bureau of Reference)sequential extraction method.The results showed that the single addition of lignite significantly reduced the contents of soil available Pb and Cd.The addition of 5.0%of lignite decreased the contents of weak acid extractable Pb and Cd by 42.60%and 25.20%,respectively.Single addition of bentonite had no effect on the content of soil available Cd,but significantly reduced soil available Pb.The mixed addition of 5%of bentonite and lignite reduced the contents of weak acid extractable Pb by 44.50%-46.00%,and increased the contents of residual Pb by 30.90%-66.80%.The mixed addition of 5.0%of lignite and bentonite decreased the content of weak acid extractable Cd by 21.70%-26.00%,and increased the content of residual Cd by 81.60%-110.9%.The best immobilization and remediation effects in the Cd/Pb contaminated soil were found under the combined addition of lignite and bentonite and were different among their added percentages.

关 键 词：膨润土 褐煤 钝化修复 铅 镉 土壤 

分 类 号：X171.5[环境科学与工程—环境科学]