Migration behavior of base metal elements in Andosols and the controlling factors

摘要

Migration behavior of base metal elements in volcanic ash soil (Andosols) profile at two (A and B) sites in Hadano, Kanagawa Prefecture, central Japan was investigated. It was found that the base metal elements in A site which is composed only of Andosols and B site which is composed of Andosols and Loam dissolve considerably from the parent-rock but partially adsorb onto secondary minerals in Andosols. The order of elemental mobility in A site is similar to the adsorption tendency of base metal elements onto iron oxy-hydroxides. It is thought that the migration behavior in A site is controlled by the adsorption onto iron oxyhydroxide, but that in B site is fractionation of solution composition influenced by the adsorption onto iron oxyhydroxide and the ion exchange reaction between downward migrating soilsolution and clay minerals.