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龙葵吸附重金属镉的生物有效性的研究 被引量:4

Effect Factors of Cd Bioavailability Adsorped by Solanum Nigrum L.
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摘要 选取龙葵及种植龙葵的土壤作为研究对象,测定土壤中重金属镉的含量、土壤重金属可交换态镉、碳酸盐结合态镉、铁锰氧化物结合态镉、有机结合态镉、残渣态镉的化学形态含量,同时测定土壤的阳离子交换量、比重、pH等,并分析了土壤中不同化学形态的重金属镉的分布特征,同时分析影响重金属镉形态分布及生物有效性的因素。结果表明,土壤重金属镉化学形态的分布规律受到重金属全量、土壤理化性质以及龙葵的生长环境的影响,其中在自然环境种植龙葵土壤中和模拟种植龙葵土壤中,其转化系数与土壤重金属镉全量之间均呈显著负相关;在二次加入外源镉的土壤中,其转化系数与土壤重金属镉全量之间呈极显著负相关。土壤重金属镉的生物有效性主要通过生物可利用系数、迁移系数及转化系数来反映,三者均受龙葵的生长环境和土壤重金属中镉全量的影响。 The contents of heavy metal cadmium,exchangeable cadmium,carbonate bound cadmium,iron manganese oxide bound cadmium,organic bound cadmium and residual cadmium in Solanum nigrum L.and the soil planted with Solanum nigrum L.were determined.At the same time,the cation exchange capacity,specific gravity and pH of soil were determined,and the heavy metals in soil with different chemical forms were analyzed.Meanwhile,the factors affecting the speciation distribution and bioavailability of cadmium were analyzed.The results showed that the distribution of cadmium in soil was affected by the total amount of heavy metal,the physical and chemical properties of soil and the growth environment of Solanum nigrum L..Among them,there is a significant negative correlation between the transformation coefficient and the total amount of heavy metal cadmium in the soil planted with Solanum nigrum L.in the natural environment and the simulated soil.In the soil with secondary exogenous cadmium,the transformation coefficient was significantly negatively correlated with the soil.There was a significant negative correlation between the total amount of Cd in soil.The bioavailability of soil heavy metal cadmium is mainly reflected by bioavailability coefficient,migration coefficient and conversion coefficient,which are affected by Solanum nigrum L.growth environment and the total cadmium content in soil.
作者 邹继颖 胡良宇 刘辉 孙彩云 李健炜 吕逸寒 权佳惠 李万海 ZOU Ji-ying;HU Liang-yu;LIU Hui;SUN Cai-yun;LI Jian-wei;LV Yi-han;QUAN Jia-hui;LI Wan-hai(Department of Resource and Environmental Engineering,Jilin Institute of Chemical Technology College,Jilin 132022,China;School of Mining and Safety Engineering,Anhui University of Science and Technology,Huainan 232001,China)
出处 《化学试剂》 CAS 北大核心 2021年第3期328-334,共7页 Chemical Reagents
基金 吉林化工学院重大科学技术项目(2016029) 吉林市科技创新发展计划项目(201750257) 吉林省教育厅“十三五”科学技术项目(JJKH20190837KJ)。
关键词 重金属 龙葵 化学形态 生物有效性 吸附 heavy metal cadmium Solanum nigrum L. chemical feature bioavailability adsorption
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