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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.09.001

Keywords: 苏南城市群,表层沉积物,二噁英类,来源,生态风险

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Abstract:

对25个苏南城市群河流表层沉积物中二噁英及17个样品中共平面多氯联苯的监测表明,PCDD/Fs和dl-PCBs中位值分别为6.61ngWHO1998TEQ·kg-1和1.43ngWHO1998TEQ·kg-1,均处于我国和亚洲河流表层沉积物的中等水平.PCDD/Fs和dl-PCBs含量水平与经济发展水平和工业规模呈现正相关.开发区新建企业是PCDD/Fs的新排放源之一.统计分析表明,南通PCDD/Fs的排放以燃煤和农药五氯酚的使用为主,无锡来源于农业活动和少量工业污染源,苏州则受到目前工业排放源的影响,3个城市的PCBs主要来源于历史上PCBs工业品的使用.96%的采样点总毒性当量浓度(TEQ)超过加拿大沉积物质量指导值(ISQGs),88%的采样点超过美国EPAISQGs,表明苏南城市群表层沉积物PCDD/Fs和dl-PCBs具有一定生态风险.

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