北京城区屋面径流中PAHs的初期冲刷效应

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...

First Flush Analysis of PAHs in Roof Runoff in Beijing

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 FF_n-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.