『Abstract
　Knowledge of differentiation of pollutants in urban runoff between dissolved and particulate matter is of great concern for a successful design of a water treatment process. Seasonal variations in pollutant load are of equal importance. Ten metals (Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn), as dissolved and particulate bound, was studied in the runoff from a major urban highway during a winter season and its following summer. Studded tyres and winter salting were expected to have an impact on the runoff water quality. The dissolved part of al, Cd, Co, Cr, Mn and Ni was significantly higher in winter in comparison with summer (p＜0.01). For Fe, however, the dissolved part was lower during winter. No significant difference was found for Cu, Pb and Zn between the two seasons. The mass concentration (mg kg^-1) for all metals was significantly higher over the summer except for Al and Co, which showed a higher mass concentration during the winter. The concentration of selected metals vs. total suspended solids (TSS) showed a linear relationship (r²＞0.95) during winter runoff events except for Cd. A good correlation (r²＞0.90) was also found for the summer period for Al, Cu, Fe, Mn, Ni and Zn. It is suggested that the metal pollutant load during winter could be assessed indirectly by measurement of TSS.

Keywords: de-icing salt; Event Mean Concentration; metal pollution; total suspended solids; storm water』

1. Introduction
2. Material and methods
　2.1. Study area
　2.2. Experimental setup and sampling
　2.3. Analysis and data treatment
3. Results and discussion
　3.1. Climatic conditions, electrical conductivity of water and EMC of suspended solids
　3.2. Dissolved and particulate metals
　3.3. Correlation of particulate bound metals and TSS
4. Conclusions
Acknowledgements
References