Runoff of Heavy Metals from Overhead Way and the Source

概要

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Heavy metals designated in the PRTR Law are used for various purposes and widely dispersed in environment, and are feared to incur adverse effects on human health and ecosystem. The purpose of this study was to clarify the actual state of effluence of these heavy metals into water environment from overhead way through rainfalls, as well as their source and flow channels.<BR>It has been clarified that the effluence of road dust on overhead way into rivers through rainfalls burdens water environment with the load of heavy metals especially Mn, Co and Zn. Cr and Pb were found in paints for road markers, and Mn in asphalt in high concentrations. It has also been clarified that high concentrations of Zn is contained in tires. When Zn concentrations were high in the sediment at the outlet spots of wastewater from overhead way that contained much effluences, the concentrations of DPPD (N, N'-diphenyl p-phenylenediamine: an additive for a tire) tended to increase. These facts verify that the main sources of Zn in road dust are tires. Under the PRTR Law, the discharge from automobile exhaust gases and paints for road markers into environment are estimated, but the discharge of Zn from tires into environment should also be closely watched.
日本環境化学会の論文