URBAN RUNOFF IMPACT ON COMPOSITION AND CONCENTRATION OF HYDROCARBONS IN RIVER SEINE SUSPENDED SOLIDS

International audienceIt is now well established that hydrocarbons are recognised like hazardous compounds, especially polynuclear aromatic hydrocarbon (PAH) [Bomboi and Hernandez, 1991; Hermann R, 1981], Urban runoff is a non negligible source of hydrocarbon that may damage the quality of receiving river. In this report, we present the first results of a study of the impact of combined sewer overflows (CSOs), during summer 1995, on the distribution of n-alkanes (C11-C37 ) in theSeine river. Figure 1 shows the site of Chatou, where suspended solids (SS) were sampled just before and during a week period following the moderate CSO event of September 7, 1995