摘要
为分析台州市电子垃圾拆解场地周边农田土壤中重金属污染特征和来源贡献,在2021年3月采集研究区230个表层(0-20 cm)农田土壤,测定了样品中9种重金属(Cr、Co、Ni、Cu、Zn、As、Cd、Hg和Pb)元素含量。通过污染负荷指数(PLI)和潜在生态风险指数(RI)分析重金属的生态风险,并利用地统计、多变量统计和正定矩阵(PMF)模型相结合的方法探究该区域土壤重金属来源。结果表明:研究区域周边农田土壤中Cd的污染水平最高,中位数超过了其农用地土壤污染风险筛选值,超标率达到了75.65%。另外,Cr和Cu的超标率也较高,分别为27.39%和42.61%。综合污染负荷指数显示,16.96%和7.39%的样本分别属于中度污染和严重污染,而在潜在风险指数中,55.22%的样本属于中等风险,34.78%的样本属于重度以上风险。地统计、多变量统计和PMF模型综合结果表明,该区域土壤中9种重金属的来源可归为4类:Cr、Co和Ni主要来源于自然源;As主要来源于农业源;Zn、Cu、Cd和Pb主要来源于金属冶炼源,集中分布在电子垃圾拆解历史遗留场地周边的农田土壤中;Hg主要来源于燃煤和工业源。
In order to analyze the pollution characteristics and source contributions of heavy metals in farmland soils around the e-waste dismantling sites in Taizhou City, 230 surface(0-20 cm)farmland soils in the study area were collected in March 2021. The contents of heavy metals(Cr, Co, Ni, Cu, Zn, As, Cd, Hg, and Pb)in these soils were determined. The ecological risks of the heavy metals were analyzed using the pollution load index(PLI)and potential ecological risk index(RI). Moreover, the sources of the soil heavy metals in this area were analyzed using the combination of geostatistics, multivariate statistics and PMF modelling. The results showed that the Cd pollution levels of farmland soils around the study area were the highest, the median exceeded the risk screening values for soil contamination of agricultural land, and the exceeding standard rate reached 75.65%. In addition, the exceeding standard rates of Cr and Cu were relatively high, 27.39% and 42.61% respectively. The comprehensive pollution load index indicated that 16.96% and 7.39% of the samples constituted moderate or serious pollution, respectively. Nevertheless, the potential risk indices(55.22% and 34.78%)of the samples were considered moderate and above severe risk, respectively. The comprehensive results of geostatistics, multivariate statistics and PMF modelling showed that the sources of nine heavy metals in these soil samples could be divided into four categories:Co, Cr, and Ni mainly come from natural sources;As mainly comes from agricultural sources;Zn, Cu, Cd, and Pb mainly come from metal smelting sources, concentrating in the farmland soils around historical e-waste dismantling sites;and Hg mainly comes from coal and industrial sources.
作者
郑宇娜
刘鹏
刘金河
周长瑞
王琪
冯美云
刘冠宏
朱旭东
林匡飞
ZHENG Yuna;LIU Peng;LIU Jinhe;ZHOU Changrui;WANG Qi;FENG Meiyun;LIU Guanhong;ZHU Xudong;LIN Kuangfei(State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2022年第7期1442-1451,共10页
Journal of Agro-Environment Science
基金
国家科技重大专项(2019YFC1803701)。
关键词
农田土壤
电子垃圾
重金属
空间分布
源解析
风险评价
farmland soil
e-waste
heavy metal
spatial distribution
source apportionment
risk assessment
