CHARACTERISTICS OF PARTICLE-ASSOCIATED PAHS IN A FIRST FLUSH OF A HIGHWAY RUNOFF

Runoff monitoring of six rainfall events was carried out in a highway, Winterthur, Switzerland focusing on first flush. Six runoff events were used to investigate the characteristics of particle-associated PAHs in first flush. The fine fraction (<45 ìm) had a relatively higher contribution than the coarse fraction. A significant contribution of the coarse fraction was observed at some periods when the runoff flow rapidly increased. Fluctuation of PAH content during a runoff event was significant in the coarse fraction and, in contrast, the PAH content in the fine fraction was less fluctuating.