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中文摘要：
为研究北京城区典型屋面径流中PAHs的污染特征,采集并分析了3种材料屋面的径流中颗粒相和溶解相PAHs的浓度.在分析屋面径流中PAHs初期冲刷效应的基础上,提出了描述初期冲刷的定量参数FFn-Max,据此探讨了降雨特征对屋面径流中PAHs初期冲刷效应的影响.结果表明,屋面径流中总PAHs和颗粒相PAHs均存在明显的初期冲刷效应,溶解相PAHs基本不存在初期冲刷效应.总PAHs的冲刷比值FF25和FF30的范围分别是0.6～2.4和0.6～2.1.根据冲刷比值FFn-Max判定3种类型屋面径流中PAHs的初期冲刷效应的显著程度顺序为：瓷砖屋面、水泥屋面〉沥青油毡屋面,瓷砖屋面与水泥屋面无显著差别.3种屋面径流中总PAHs的初期冲刷效应与各场降雨事件的气象特征参数之间没有显著的相关性.
英文摘要：
Roof runoff samples of six storm events were collected at three different sites in the urban area of Beijing during the rainy season of 2008.The samples were analyzed for PAHs in both particle and dissolved phases.On the basis of the field measured data,the first flush phenomenon of PAHs was quantitatively analyzed using a newly defined FFn-Max,and the influences of the storm event characteristics were discussed.In roof runoff,the first flush phenomena of total PAHs and PAHs in particle phase were noted,and PAHs in dissolved phase was not observed with first flush.The ranges of the first flush values for FF25 and FF30 were 0.6-2.4 and 0.6-2.1,respectively.For different types of roof materials,the strength of the first flush followed the order of： tile roof,cement roof asphaltic felt roof.There is no significant difference between the tile roof and cement roof.No significant correlation was observed between the occurrence of first flush and the rainfall characteristics.
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