Topsoil dichlorodiphenyltrichloroethane and polychlorinated biphenyl concentrations and sources along an urban-rural gradient in the Yellow River Delta
Topsoil dichlorodiphenyltrichloroethane and polychlorinated biphenyl concentrations and sources along an urban-rural gradient in the Yellow River Delta作者机构:Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta Binzhou University Binzhou 256603 China. Institute of Restoration Ecology China University of Mining and Technology Beijing 100083 China Jinan Entry-Exit Inspection and Quarantine Bureau Jinan 250000 China
出 版 物:《Journal of Environmental Sciences》 (环境科学学报(英文版))
年 卷 期:2012年第24卷第9期
页 面:1655-1661页
核心收录:
学科分类:090403[农学-农药学(可授农学、理学学位)] 0830[工学-环境科学与工程(可授工学、理学、农学学位)] 083001[工学-环境科学] 08[工学] 09[农学] 0904[农学-植物保护]
基 金:supported by the Scientific Award Fund for the Excellent Middle-Aged and Young Scientists of Shandong Province(No.2008BS09024) the Science and Technology Development Project of Binzhou City(No. 200818) the Science and Technology Development Project of Shandong Province(No.2009GG10006012)
主 题:DDTs PCBs Yellow River Delta source apportionment risk assessment
摘 要:The Yellow River Delta (YRD) is a typical agricultural and petrochemical industrial area of China. To assess the current status of soil dichlorodiphenyltrichloroethane (DDT) and polychlorinated biphenyls (PCB) residues, topsoil samples (0-15 cm) (n = 82) were collected in Bincheng District, at the geographic center of the YRD. The total concentrations of six DDT homologues were within 3.3-3819 ~tg/kg, with a mean concentration of 191 ~tg/kg, showing significant increase along urban-rural gradient. Soil concentrations of seven indicator PCBs in the area ranged from non-detectable to 87.0 ~g/kg, dominated by heavily chlorinated PCBs (PCB-101 and -118). Soil PCBs concentrations were significantly greater in urban than suburban and rural areas. Principal component and multiple linear regression analysis suggest that 86.4% of soil DDTs originate from past DDT usage, and 13.6% originate from dicofol application. Soil PCBs most likely originate from the petrochemical industry (77.1%), municipal solid waste disposal (16.5%), local commercial PCB homologues usage (5.2%), and long-range atmospheric deposition (1.2%). In general, soil DDTs pollution was classified as low level, and mean PCBs concentrations were below the severe contamination classification range. Because PCB-118 is a dioxin-like congener, monitoring and remediation is advised to assess and reduce negative environmental and human health effects from soil DDTs and dioxin-like congeners in the study area.