凹凸棒石对土壤Cd污染的钝化修复  

Stabilization Remediation of Cd in Soil Added with Attapulgite

作　　者：任珺 周怡蕾 曲自超 余方可 杨万辉 黄磊[1,2] 陶玲 Ren Jun;Zhou Yilei;Qu Zichao;Yu Fangke;Yang Wanhui;Huang Lei;Tao Ling(Key laboratory of Yellow River Water Environment in Gansu Province,Lanzhou Jiaotong University,Lanzhou,Gansu 730070;Institute of Environmental Ecology,School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070;Gansu Hanxing Environmental Protection Co.,Ltd.,Lanzhou,Gansu 730070;School of Environmental Science and Engineering,Shaanxi University of Science and Technology,Xi’an,Shaanxi 710021)

机构地区：[1]兰州交通大学甘肃省黄河水环境重点实验室,甘肃兰州730070 [2]兰州交通大学环境与市政工程学院,环境生态研究所,甘肃兰州730070 [3]甘肃瀚兴环保科技有限公司,甘肃兰州730070 [4]陕西科技大学环境科学与工程学院,陕西西安710021

出　　处：《非金属矿》2022年第5期97-101,106,共6页Non-Metallic Mines

基　　金：甘肃省黄河水环境重点实验室项目(20JR2RA002,21YRWEK007,21YRWEG003);甘肃省教育厅产业支撑计划项目(2021CYZC-31);兰州市人才创新创业项目(2021-RC-41);兰州交通大学大学生科技创新项目(DXS2022-017)。

摘　　要：通过钝化试验和盆栽试验,研究凹凸棒石添加量对土壤的理化性质、土壤中Cd的生物有效态、化学形态和玉米植株不同部位Cd的富集的影响,进而评价土壤中Cd的钝化效果和环境风险。结果表明,土壤中添加5%凹凸棒石处理效果最佳,Cd的DTPA和TCLP提取态钝化效率分别为56.97%和45.10%,酸溶态、可还原态含量较CK钝化组分别降低42.47%和32.69%,可氧化态和残渣态含量分别增加27.27%和69.23%,有效降低了重金属Cd的生物有效性和迁移能力,从而降低土壤中Cd的环境风险和潜在环境风险。盆栽试验中,随着凹凸棒石添加量的增加,玉米植株地上部分和地下部分对Cd的富集量及转运系数逐渐降低,有效缓解了Cd胁迫对玉米植株的毒害作用。Stabilization experiments and pot experiments were conducted to study the effects of different addition amounts of attapulgite on the physicochemical properties of soil,the bioavailable state and chemical speciation of Cd in the soil,maize growth and Cd enrichment in maize,and then evaluated the ecology toxicity and environmental risks of Cd in the soil.The results showed that the stabilization efficiency of adding 5%attapulgite is the best.The stabilization efficiency of the DTPA and TCLP extractable Cd were 56.97%and 45.10%respectively.Compared with stabilization by CK,the acid-soluble and reducible content of Cd were significantly reduced by 42.47%and 32.69%,and the oxidizable and residual content of Cd were significantly increased by 27.27%and 69.23%,respectively,effectively reduce the bioavailability and migration ability of heavy metal Cd,thereby reduce the environmental risk and potential environmental risk of Cd in the soil.In the pot experiment,with the increase in the amount of attapulgite,the concentration of Cd in the aboveground and underground parts and transfer factor of the maize gradually decreased,which effectively alleviated the toxic effect of Cd stress on the maize.

关 键 词：凹凸棒石 CD 环境风险 钝化 生态毒性 

分 类 号：X53[环境科学与工程—环境工程]