土壤矿物、胡敏酸和微生物的混合体系对Cd的吸附特征

发布时间：2018-01-15 18:08

本文关键词：土壤矿物、胡敏酸和微生物的混合体系对Cd的吸附特征　出处：《生态环境学报》2016年11期 　论文类型：期刊论文

【摘要】：土壤重金属污染对植物、水体、生态系统的影响与土壤溶液(包括渗漏水和地表径流)的浓度及其时空变化密切相关,这是因为能被生物吸收和随水迁移的污染物、营养物主要溶解在水中。要定量在时间和空间上都变化的土壤溶液浓度,又必须阐释土壤固相的吸附(解吸)作用以及不同土壤组分(土壤矿物、有机质、微生物)的相互作用和复合效应。最简单的农田土壤生态系统:土壤-水-植物-微生物系统,也是属于多质、多相的系统。然而目前国内外对于复合系统的复合效应研究相当薄弱,以致难以对单项研究结果和数据进行综合分析。为探讨土壤固相吸附重金属过程中各组分的相互作用机制,本研究以胡敏酸(humic acid,HA)代表有机质,土壤矿物代表无机质,耐镉性微生物代表土壤微生物,采用批量等温吸附实验的方法,模拟了土壤系统中基本单元无机质-有机质-微生物对Cd的吸附效应,阐明土壤矿物-有机质-微生物在重金属Cd吸附方面的相互作用。研究结果表明:对Cd的吸附作用,HA和蒙脱石(montmorillonite)、蒙脱石和微生物、硅藻土(diatomite)和微生物具有加和性;HA和硅藻土之间,HA、微生物和硅藻土之间,以及HA和微生物之间表现为协同作用;HA、微生物和蒙脱石之间表现为拮抗作用。HA容易与其他吸附剂发生协同作用;两种矿物相比,硅藻土更容易发生协同作用,而蒙脱石表现为拮抗作用的趋势更加明显。蒙脱石和硅藻土与HA混合培养不同时间,硅藻土和蒙脱石吸附的HA的量及其混合物对Cd的吸附量都随时间的延长而增加。
[Abstract]:The effects of soil heavy metal pollution on plants, water bodies and ecosystems are closely related to the concentration of soil solutions (including leakage and surface runoff) and their temporal and spatial variations. This is because nutrients are mainly dissolved in water because of pollutants that can be biologically absorbed and transported with water. The concentration of soil solutions varies in both time and space. It is also necessary to explain the adsorption (desorption) of soil solids and the different soil components (soil minerals and organic matter). The simplest farmland soil ecosystem: the soil-water-plant-microorganism system is also polymorphic. However, the research on the compound effect of the composite system is very weak at home and abroad. Therefore, it is difficult to analyze the individual research results and data. In order to study the interaction mechanism of each component in the process of soil solid adsorption of heavy metals, Hu Min acid humic acid was used in this study. Ha) represents organic matter, soil mineral represents inorganic substance, cadmium tolerant microorganism represents soil microorganism, and batch isothermal adsorption experiment method is adopted. The adsorption effect of inorganic organic matter microorganism on CD in soil system was simulated. The interaction of soil mineral, organic matter and microorganism in the adsorption of heavy metal CD was elucidated. The results showed that the adsorption of CD on HA and montmorillonite. Montmorillonite and microorganisms (diatomiteite) and microbes are additive; There was a synergistic effect between HA and diatomite, between microorganism and diatomite, and between HA and microorganism. Ha, the antagonism between microorganism and montmorillonite was that HA was easily synergistic with other adsorbents. Compared with the two minerals, diatomite is more prone to synergism, while montmorillonite is more antagonistic. Montmorillonite and diatomite mixed with HA for different time. The amount of HA adsorbed by diatomite and montmorillonite and the amount of CD adsorbed by the mixture increased with time.
【作者单位】：华南农业大学资源环境学院//土壤环境与废物资源农业利用广东省高校重点实验室;
【基金】：国家“863”项目(2012AA06A202) 国家自然科学基金项目(41371308);国家自然科学基金项目(41541012) 广东省科技计划项目(2012A030700003) 广东省自然科学基金团队项目(S2011030002882)
【分类号】：X53;X131
【正文快照】： 引用格式:孙岩,吴启堂,崔理华,卫泽斌,谭蒙,马强,刘朋.2016.土壤矿物、胡敏酸和微生物的混合体系对Cd的吸附特征[J].生态环境学报,25(11):1813-1821.SUN Yan,WU Qitang,CUI Lihua,WEI Zebin,TAN Meng,MA Qiang,LIU Peng.2016.Studies on the adsorption characteristics ofCd

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