Polychlorinated Biphenyls in Chinese Surface Soils

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• 作者：Nanqi Ren ; Mingxue Que ; Yi-Fan Li ; Yu Liu ; Xinnan Wan ; Diandou Xu ; Ed Sverko ; ^$ ; Jianmin Ma
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：June 1, 2007
• 年：2007
• 卷：41
• 期：11
• 页码：3871 - 3876
• 全文大小：266K
• 年卷期：v.41,no.11(June 1, 2007)
• ISSN：1520-5851

文摘

Polychlorinated biphenyl (PCB) concentrations in surfacesoil samples (0-20 cm) from 52 sites (4 background, 39 rural,and 9 urban) across China in 2005 are presented. Theaverage concentration of total PCBs among all the siteswas 515 pg/g dry weight (dw), approximately one-tenth ofthat in global background soil in 1998. Differences ofless than 1 order of magnitude were found between allbackground and rural sites, indicating a generally uniformdistribution of PCBs in Chinese background/rural surfacesoil. While the major PCB homologue group in globalbackground soil is hexa-PCB followed by penta-PCB, themajor PCB homologue group in Chinese background/ruralsoil is tri-PCB followed by di-PCB, indicating a ratherfresh signature in comparison to the much weathered PCBsin global surface soil. The correlation between PCBsand also each PCB homologue group per soil organic carbon(SOC) content in background/rural soil with longitudefrom 80 to 122 East was studied. The results indicatedthe strong influence of PCBs concentrations in Chinesebackground/rural soil by proximity to source region and SOCcontent, and also provided evidence for urban fractionationeffect of PCBs in soil in the city of Shanghai and thelongitudinal fractionation of PCBs in Chinese background/rural soil from east to west. This work is the firstcomprehensive and spatial study of its kind for PCBs inChinese surface soil on a national scale, and the datapresented in this study can provide baseline informationfor establishing a long-term PCBs monitoring program inChina.