有机黏土对污染土壤中苋菜生理和吸收积累菲、芘的影响  

Effects of Modified Organic Clays on Physiology and Adsorption-accumulation of Phenanthrene and Pyrene in Amaranthus tricolor L. Growth in PAHs-polluted Soil

作　　者：蒲丽蓉 蔡月 王星皓 施维林[1] 高娟[3] PU Lirong;CAI Yue;WANG Xinghao;SHI Weilin;GAO Juan(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215009,China;National Engineering Laboratory for Safe Remediation Technology of Contaminated Sites,Beijing 100015,China;Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009 [2]污染场地安全修复技术国家工程实验室,北京100015 [3]中国科学院南京土壤研究所,南京210008

出　　处：《土壤》2022年第1期128-135,共8页Soils

基　　金：国家重点研发计划项目(2017YFA0207000);江苏省重点研发计划(社会发展)面上项目(BE2020789);污染场地安全修复技术国家工程实验室开放基金项目(NEL-SRT201908)资助。

摘　　要：基于有机改性黏土具有廉价、高效吸附多环芳烃(PAHs)等特性,探究了3-巯基丙基三甲氧基硅烷改性蒙脱土(TMSP-SMF)和十六烷基三甲基溴化铵改性蒙脱土(CTAB-SMF)对污染土壤中PAHs的固定效果,并考察了其施用后对土壤理化性质、微生物群落以及植物吸收累积PAHs的影响。结果表明:TMSP-SMF和CTAB-SMF的施用未影响土壤的pH,但土壤的渗透性有所降低,同时土壤中变形菌门(Proteobacteria)及放线菌门(Actinomycetes)的相对丰度有所增加。此外,TMSP-SMF和CTAB-SMF可以有效地阻控污染土壤中苋菜对菲和芘的吸收。与污染控制处理相比,TMSP-SMF处理苋菜地上部菲和芘的含量分别降低了20.1%±9.5%和13.9%±16.9%;根部分别降低了16.7%±6.6%和21.2%±13.3%;CTAB-SMF处理苋菜地上部菲和芘的含量分别降低了47.0%±8.7%和44.3%±7.0%,根部分别降低了59.1%±4.7%和60.0%±8.1%。可见,土壤中添加2.5%的TMSP-SMF或CTAB-SMF在一定程度上减少了植物对PAHs的累积,从而缓解了植物对PAHs累积的氧化应激反应;而有机黏土CTAB-SMF比TMSP-SMF更适用于作为污染土壤中PAHs的固定修复材料,有望应用于PAHs污染农田土壤的修复。Montmorillonite modified with cetyltrimethyl ammonium bromide(CTAB-SMF)and 3-mercapto propyl trimethoxy silane(TMSP-SMF)have been proven to adsorb much naphthalene in batch experiments,but their effects in soils have not been tested.In this study,2.5%of CTAB-SMF or TMSP-SMF were added as soil amendments in phenanthrene and pyrene contaminated soils,and pot experiments with Amaranthus tricolor L.were conducted.The results showed that the addition of two amendments had no significant change on soil pH values(P>0.05),but the treated soils permeability decreased by 24.62%±1.26%and their relative abundance of Proteobacteria and Actinomycetes in soil increased obviously compared with the control group.It was also found that the addition of two organoclays could reduce the bioavailability of PAHs in soil and the accumulation of phenanthrene and pyrene in plants.Compared with the control,the concentrations of phenanthrene and pyrene in Amaranthus tricolor L.shoots reduced by 20.1%±9.5%and 13.9%±16.9%with addition of 2.5%TMSP-SMF,while their concentrations in roots decreased by 16.7%±6.6%and 21.2%±13.3%,respectively.For CTAB-SMF,the concentrations of phenanthrene and pyrene in shoots decreased by 47.0%±8.7%and 44.3%±7.0%,and that in roots decreased by 59.1%±4.7%and 60.0%±8.1%,respectively.Furthermore,the oxidative stress in plant induced by PAHs was also reduced due to the addition of organoclays in polluted soils.The results of this study indicated that TMSP-SMF and CTAB-SMF could be used as remediation agents in PAHs-polluted soil, and CTAB-SMF could be more potential than TMSP-SMF in PAHs-polluted soil remediation.

关 键 词：多环芳烃 吸收积累 苋菜 有机黏土 氧化应激 

分 类 号：X53[环境科学与工程—环境工程]