TomokiˇˇKATAYAMA
Development of a new type compact sampler for monitoring storm water road runoff and the evaluation of heavy metals loading
Toshiya KOMATSUˇ¤Shuji HIMENO
The loading to the environment of the road runoff that is non-point pollution recently increases. However, it is not planned, because the realities grasp is not done. The purpose of this study is to measure the heavy metals included in the road runoff for the long term, and to clarify the discharge property in various rainfall patterns.
It is impossible to obtain the whole road runoff of one rainfall. A new type compact sampler which can obtain water samples with a constant division, was developed in this study. This device showed excellent division performances. Eight water samples were collected using this device during the rainfall events from July to November in 2007. Concentrations of Cd,Cr, Pb, Zn and Cu in the samples were measured and the loading of each heavy metal was calculated.
Comparing with the rain water in the same spot, all heavy metals except Cd in road runoff showed significantly high concentrations. It was suggested that the heavy metals in road runoff increased by the influence of traffic activities. The total loadings of Zn showed maximum value among the five heavy metals measured. Loading of Zn by each rainfall significantly increased as the amount of rainfall increased.
Please use "previous botton" to return the previous page