Pollutants from roads are spread by mechanisms such as splash, spray and ploughing. In this study the spreading was studied at two locations where information of the local weather was available and the amount of salt applied on the road could be obtained. When comparing the deposition of Na, Ca, K and Mg, the road-related gradient is obvious; the increase of sodium in the containers closest to the road is sometimes more than 1000-fold, and the increase of the other cations 10-100-fold. Also during a period of no de-icing the deposition of cations is higher towards the road. The deposition of Na is related to amount of road salt applied, and also to wind and type and amount of precipitation. The increase of other cations could be an effect of weathering and/or ion-exchange on the fresh surfaces of the road wear. (A) For the covering abstract of the conference see ITRD E202707.
Samenvatting