摘要
In areas with a high geological background of heavy metals,some edible plants could pose a serious threat to human health.In order to find effective methods to remove heavy metals or reduce their harm,this study investigated the enrichment conditions of five soil heavy metals,Cd,Pb,Cu,Zn and Cr,in four edible plants in a mining area,Baoshantao,in eastern China that has a high geological background of metals,and two groups of experiments were designed to investigate the effects of passivators on their enrichment.The results showed that the soil heavy metal content in the study area has a certain degree of spatial variability.The five heavy metal element contaminants in the soil are in the order of Cd>Cu>Zn>Pb>Cr.The enrichment coefficients and the transfer coefficients of different edible plants were different for the different heavy metals.The two groups of passivators showed better passivating effects with an increase in passivating agent dosage.The smaller the enrichment coefficient of water spinach,the lower the bioavailability.The results of this study can provide a scientific basis for the restoration of soil heavy metal pollution and the safe use of land in areas with a high geological background of heavy metals.
在重金属地质背景较高的地区,当地一些可食用植物可能会威胁人类健康。为寻找去除重金属或减少其危害的有效方法,本研究考察了中国东部某高地质背景宝山陶金属矿区的四种食用植物中Cd(镉)、Pb(铅)、Cu(铜)、Zn(锌)、Cr(铬)五种土壤重金属的富集条件,并设计了两组实验考察钝化剂对其富集的影响。结果表明,研究区土壤重金属含量具有一定的空间变异性,土壤中五种重金属元素的污染程度依次为Cd>Cu>Zn>Pb>Cr;不同食用植物对重金属的富集系数和转移因子不同;两组钝化实验表明,随着钝化剂用量的增加,钝化效果越好,水菠菜的富集系数越小,生物有效性越低。本研究可为高地质背景区土壤重金属污染修复和土地安全利用提供科学依据。
基金
The National Natural Science Foundation of China(42371185)
The Anhui Normal University College Students Innovation and EntrepreneurshipTraining Program(2022056511).
