STREET WASH-OFF BEHAVIOR OF HEAVY-METALS, POLYAROMATIC HYDROCARBONS AND NITROPHENOLS

During three storm events, the run-off from a busy road junction in Ba yreuth was analysed for dissolved and particle-bound concentrations of heavy metals, polyaromatic hydrocarbons (PAH) and nitrophenols, as we ll as for general hydrochemical parameters (pH, EC, SS, DOC, POC). Nit rophenols are found to be totally dissolved, whereas heavy metals, esp ecially lead, and PAH are primarily associated with suspended solids. The partitioning of cadmium and copper is significantly governed by or ganic carbon. Based on the chemographs and the results of the principa l component analysis, we suggest the following three wash-off mechanis ms for the selected contaminants: solution of easily water-soluble com pounds, particle wash-off and mobilisation of oil films.