抄録
The chemical forms and the run-off characteristics of particulate heavy metals were researched. Before the chemical analysis, the suspended matters contained in water were separated by continuous centrifuge, then the various types of heavy metals were fractionated into 5 groups from them by various solvents. Together with the data of examining the chemical components in water and mud, the followings were found out:(1) The ratio of natural mineral heavy metals becomes high in flood time, (2) Cu originate from human activities because of the close relation with organic matters, (3) Much of Mn and Zn have a similar behavior, and they originate from industries and households. Though the amount of heavy metals in suspended solid in studied area is not so much, run-off control of suspended solids by consolidating drainage system is available for improving water circumstances.
