Author(s): Hiroshi Yasuda; Shigeo Uchida; Yoriteru Inoue

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Abstract: Hazardous materials discharged into the environment can lead tointake by humans through a variety of pathways.The terrestrialecosystem is most important in the risk evaluation because not onlyare humans living in their respective ecosystem,but also most oftheir food comes from terrestrial sources(Til1 and Meyer,1982).Materials deposited on surface soil permeate into deeper soilthroughout rainfall and irrigation,resulting in groundwaterpollution.The lo8s rate of materials from the surface soil isaffected by the soil adsorption properties,the solution velocity,and other factors. In general,the vertical material movement insoil is described by the following dispersion equation(Inoue andKaufman,1963):

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Year: 1993