【摘要】 为了解城市生活垃圾焚烧发电厂周边表层土壤中二噁英、重金属来源及分布特征,选取成都地区3座典型生活垃圾焚烧厂作为研究对象,开展了周边土壤中17种多氯二苯并对二噁英/呋喃(PCDD/Fs)及11种重金属含量监测.结果显示,土壤样品中的PCDD/Fs和重金属的浓度范围分别为0.25～7.5ngI-TEQ/kg和0.23～580.57mg/kg;3座垃圾焚烧厂周边土壤中多氯二苯并呋喃(PCDFs)的毒性当量浓度贡献率要高于多氯二苯并二噁英(PCDDs),PCDFs毒性当量浓度平均贡献率达到55%;土壤样品中Cd、Hg、Pb、Cu、Zn之间具有良好的相关性,Hg、Pb、Zn与部分PCDFs具有良好的相关性,相关系数r分别为0.792、0.760、0.788,所对应的p值分别为0.034、0.047、0.035,并被归类为同一聚类,可将这部分重金属元素作为重金属示踪剂来表征PCDFs的来源.更多还原

【Abstract】 In order to understand the source and distribution characteristics of dioxin and heavy metals in surface soils around the municipal solid waste incineration plant, three waste incineration plants in the Chengdu area were selected as research objects, 17 kinds of Polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) and 11 heavy metals in the surrounding soil were monitored. The concentrations range of 0.25～0.75 ng I-TEQ/kg for PCDD/Fs and 0.23～580.57 mg/kg for heavy metals in the soil samples were determined, respectively. The contribution rate of toxic equivalent concentration of Polychlorinated dibenzofuran( PCDFs) in the soil around the three waste incineration plants was above Polychlorinated dibenzodioxins(PCDDs), the average contribution rate of PCDFs to toxic equivalent concentration reached 55 %;Cd, Hg, Pb, Cu and Zn in soil samples had good correlations among each other. Hg, Pb and Zn had good correlations with some PCDFs. The correlation coefficients(r) were 0.792, 0.760 and 0.788, and the corresponding p values were 0.034, 0.047 and 0.035 respectively. Therefore Hg, Pb and Zn were classified as the same cluster, which can be used as heavy metal tracers to characterize the source of PCDFs.更多还原