阜阳市东部地区农田土壤重金属污染评价  

Evaluation of Heavy Metal Pollution of Farmland Soil in Eastern Area of Fuyang City

作　　者：胡琪 刘少玉[1] 刘鹏飞[1] 张文强 HU Qi;LIU Shao-yu;LIU Peng-fei(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,Hebei 050061)

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]山东省地矿工程勘察院,山东济南250014

出　　处：《安徽农业科学》2020年第7期68-73,共6页Journal of Anhui Agricultural Sciences

基　　金：中国地质调查局地质调查项目(DD20190532)。

摘　　要：在研究区布设24个垂向剖面,共采集0~200 cm深度范围内农田土壤样品120件,选择其中As、Pb、Cr、Ni和Cd共5种重金属进行研究,并利用地累积指数法和潜在生态风险指数法进行污染评价。结果表明,样品中5种重金属平均含量均超过安徽省土壤重金属背景值;其中Cd已超过土壤质量二级标准值。剖面上元素含量由浅到深总体呈先减后增的趋势,浅部受干扰显著,深部较稳定。地累积指数法评价显示,土壤中Cd、As、Cr和Ni存在不同程度的污染;潜在生态风险指数法评价显示,该区Cd处于强风险等级,其余4种均属于轻微等级;研究区整体属轻微风险等级,Cd是该区土壤潜在生态风险的主要影响因子。重金属最主要来源途径是农田施用的化肥、农药、采煤及交通运输的污染物释放。24 vertical sections were laid in the study area,and 120 farmland soil samples in the depth range of 0-200 cm were collected.Five heavy metals of As,Pb,Cr,Ni and Cd were selected for analysis and utilization.The geoaccumulation index method and the potential ecological risk index method were used for pollution assessment.The results showed that the average content of five heavy metals in the sample exceeded the background value of heavy metals in Anhui Province;Cd exceeded the secondary standard value of soil quality.The content of the elements on the profile showed a trend of decreasing first and then increasing from shallow to deep.The shallow part was significantly disturbed and the deep part was stable.The evaluation of the geoaccumulation index method showed that there were different degrees of pollution of Cd,As,Cr and Ni in the soil;the evaluation of potential ecological risk index showed that the Cd in this area was at a high risk level,and the other four were all slightly graded;A slight risk rating,Cd was the main influencing factor for the potential ecological risk of the soil in the area.The main source of heavy metals was the release of pollutants from fertilizers,pesticides,coal mining and transportation.

关 键 词：阜阳市 土壤重金属 分布特征 地累积指数法 潜在生态风险指数法 

分 类 号：X53[环境科学与工程—环境工程] X829