近电器拆解区土壤-蔬菜多氯联苯污染及其健康风险  

THE HEALTH RISK ASSESSMENT AND BIOACCUMULATION OF PCBs IN SOIL-VEGETABLES NEARBY E-WASTE AREA

作　　者：张建英[1] 李丹峰[1] 王慧芬[1] 唐先进[1] 朱荫湄[1] 

机构地区：[1]浙江大学环境与资源学院生态环境研究中心,杭州310029

出　　处：《土壤学报》2009年第3期434-441,共8页Acta Pedologica Sinica

基　　金：浙江省自然科学基金项目(Z506039);国家重点基础研究发展规划项目(2002CB410810)资助

摘　　要：选择浙江省某典型电器拆解区,研究了该区域附近农田土壤和蔬菜中多氯联苯的污染水平,并进行健康风险评价。结果表明,该区农田土壤中PCBs含量为6.78～15.48μgkg^(-1),蔬菜样品中PCBs平均含量为5.98～130.70μg kg^(-1),与西藏土壤的背景值和浙江省农村土壤的PCBs污染水平比较,电器拆解区附近农田存在PCBs累积污染。以食物链为主要暴露途径的健康风险评价结果表明,生命期致癌风险水平为6.50×10^(-6)～1.24×10^(-4),超过PCBs致癌基准浓度对应的生命期致癌风险水平1～3个数量级;生命期非致癌风险水平在部分农田大于可接受风险水平(HQ=1)。该区域农田生态系统中土壤和部分常见蔬菜存在多氯联苯污染,已构成较大的人体健康风险。PCB contamination levels of farmland soil and vegetables in the surroundings of E-waste contaminated areas were investigated and the risks to human health in these areas were assessed. The investigation findings show that the average PCB concentrations in soil and vegetables were 6.78 - 15.48 μgkg^-1 and 5.98 - 130.70 μgkg^-1 respectively. Compared with the background level of Tibet, West China, and the PCB contamination level in the rural farmland of Zhejiang Province, there exists high accumulations of PCBs in the farmland surrounding E-waste areas. The health risk assessment based on the comparative analysis of soil and vegetables pollution resulting from the exposure to food chain indicates that cancer risk in one＇s lifetime is 6.50× 10 ^-6 - 1.24 × 10^-4, which is one to three order of magnitude higher than the standard concentration level. It is suggested from vegetable samples that the non-carcinogenic risk level for some farmlands is higher than the acceptable level （ HQ = 1 ）. It is concluded that in the stated area PCB concentration in the farmland ecological system has posed a major risk to human health.

关 键 词：多氯联苯(PCBs) 健康风险 污染土壤 蔬菜 

分 类 号：X503.1[环境科学与工程—环境工程]