农用地土壤重金属污染特征及其生态风险评价OA北大核心CSTPCD
Soil Heavy Metal Pollution Characteristics and Ecological Risk Assessment
为探讨某农用地土壤重金属污染及生态风险情况,采集池州市某典型农用地表层土壤样品,分析Cd、As、Ni、Hg、Pb、Cr、Cu、Zn共8种重金属的含量,并采用单因子指数法、内梅罗综合污染指数法和潜在生态危害指数法对该农田土壤重金属污染进行生态风险评价.结果表明:Cd、As、Ni、Hg、Pb、Cr、Cu、Zn的平均含量分别为0.71,25.80,33.31,0.23,33.17,46.59,37.15,130.28 mg·kg-1,其中,Cd、As、Ni等含量均有不同程度地超过国家标准规定的筛选值;而且除Cr外其他重金属平均值和中值均超过背景值.各重金属元素的单因子评价污染指数平均值依次为Cd>As>Cu>Hg>Ni>Zn>Cr>Pb,且Cd单项指数平均值为轻度污染等级,其他重金属为无污染等级,表层土壤样品中优先保护类、安全利用类的占比分别为15%(6/40)、85%(34/40),各点污染在可控等级范围;内梅罗综合污染评价安全、警戒线、轻度、中度和重度污染的等级的比例分别为7.5%、15%、45%、30%和2.5%,综合指数平均值为1.77,超过警戒线级别,属轻度污染等级,其中,Cd是最主要影响元素,与单因子评价结果一致;8种重金属元素的单因子潜在生态风险指数(single factor eco-logical risk index)大小依次为Hg>Cd>As>Cu>Ni>Pb>Cr>Zn,土壤中重金属综合潜在生态风险(potential ecological risk in-dex)平均值为194.73,为中等生态风险等级,其中,Cd是研究区污染风险最高的重金属元素,Hg是潜在生态风险高的重金属,需加强对Cd、Hg的风险管控.该区域农田土壤存在酸化趋势,是重金属累积的重要因素,其他人类活动增加了重金属积累的风险,需强化对该土壤有效的安全利用措施.
In order to investigate the soil heavy metal pollution and ecological risk of a certain agricultural land,surface soil samples of a typical agricultural land in Chizhou City were collected and analyzed for the content of 8 heavy metals,Cd,As,Ni,Hg,Pb,Cr,Cu and Zn.The ecological risk of heavy metal pollution was evaluated by single factor index method,Nemerow comprehensive pollution index method and potential ecological hazard index method.The results show that:The average contents of Cd,As,Ni,Hg,Pb,Cr,Cu and Zn were 0.71,25.80,33.31,0.23,33.17,46.59,37.15 and 130.28 mg·kg-1,respectively.The contents of Cd,As and Ni all exceeded the screening values stipulated by national standards to varying degrees.In addition,the average and median values of other heavy metals exceeded the background values except Cr.The average value of single factor evaluation pollution index of each heavy metal element is Cd>As>Cu>Hg>Ni>Zn>Cr>Pb,and the average value of single index of Cd is light pollution level,and other heavy metals are pollution-free level.In the surface soil samples,the proportion of priority protection and safe utilization were 15% (6/40)and 85% (34/40),respectively,and the pollution at each point was in the controllable range.The proportions of safety,warning line,light,moderate and severe pollution levels in Nemero's comprehensive pollution evaluation were 7.5%,15%,45%,30% and 2.5%,respectively.The average composite index was 1.77,exceeding the warning line level and belonging to the mild pollution level.Cd was the most important influencing element,which was consistent with the results of single factor evaluation.The single factor potential ecological risk(Ei)index of the eight heavy metals was Hg>Cd>As>Cu>Ni>Pb>Cr>Zn,and the average comprehensive potential ecological risk(RI)of heavy metals in soil was 194.73,indicating a moderate ecological risk level.Among them,Cd was the heavy metal element with the highest pollution risk in the study area.Hg is a heavy metal with high potential ecological risk,so it is necessary to strengthen the risk control of Cd and Hg.The acidification trend of farmland soil in this region is an important factor in the accumulation of heavy metals.Other human activities increase the risk of heavy metal accumulation,so it is necessary to strengthen the measures for the safe utilization of the soil effects.
贾莉;孙建平;何小青;刘赵文;潘文武
池州学院 材料与环境工程学院,安徽池州 247000池州学院 地理与规划学院,安徽池州 247000
环境科学
农用地重金属污染污染特征生态风险评价
agricultural landheavy metal pollutionpollution characteristicsevaluation of ecological risk
《沈阳农业大学学报》 2024 (004)
435-445 / 11
安徽省教育厅科研重点项目(KJ2021A1132,KJ2019A0865);安徽省社会科学创新项目(2020CX060);安徽省大学生创新创业训练计划项目(S202211306100)
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