Abstract
In order to grasp the change of metal (Al, Fe, Mn, Zn, As, Pb and Cu） concentrations in agricultural water through paddy field, total metal and dissolved metal concentrations in influent, paddy surface water and effluent were measured. There were few differences between Total Al and Total Fe concentrations in influent and effluent. Total Zn, Total Pb and Total Cu concentrations in effluent were lower values than influent. Zn, Pb and Cu may settle or adsorb to the soil in paddy field. Total As concentration in effluent was higher values than influent. The main factor may be the elution of As from manures and paddy soil and methylation of As. Dissolved Mn concentration for Total Mn in effluent was higher value than influent. The main factor may be the elution of Mn from paddy soil and dissolution of organic complexes of Mn.
