Kou MURATA
Evaluation of heavy metals loading of storm water road runoff using updated version compact sampler
Toshiya KOMATSUˇ¤Shuji HIMENO
TNon-point pollution is caused by pollutant loads outflowing from diffuse sources. Especially, stormwater road runoff has a significant role in non-point pollution. The purpose of this study is to measure heavy metals contained in road runoff for many rainfall events, and to clarify the heavy metal loads under various rainfall conditions. Sampling of road runoff was conducted using a new developed compact sampler which can accurately divide water volumes into a fixed ratio. Fifteen composite road runoff samples were collected using this device during the period from April to November in 2008.
Concentrations of five heavy metals (Cd, Cr, Pb, Zn and Cu) in the samples were measured. In most cases, heavy metals were existed mainly in particulate form. Comparing with the rainwater in the near spot, all heavy metals in road runoff showed significantly high concentrations. It was suggested that the heavy metals in road runoff increased by the influence of road dust. Among five heavy metals, only Pb load showed a significant correlation with the total rainfall amounts, which suggested that other than road dust had a significant influence on the load. Further more, annual load of each heavy metal was estimated using the measured value. As the results, the highest load was verified in Zn.
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