Migration models of neptunium and americium in groundwater under the present condition of humic substances

Tanaka, Tadao ; Sakamoto, Yoshiaki ; Sawada, Hiroshi; Ogawa, Hiromichi

We have performed migration experiments of Np(V) and Am(III) for crushed granite, under the coexistent condition with humic acid substance. As for Np, the periodical concentration changes in the breakthrough curve and the migration velocity of Np passed through the column were not affected by the coexistence of the humic substance. As for Am, on the other hand, the periodical concentration changes in the breakthrough curve were affected by the humic substance concentration. The migration behavior of Am passed through the present column system could be expressed by a migration model taking account of the non-equilibrium state.