Modeling of neptunium(V), plutonium(IV) and americium(III) sorption on soils in the presence of humic acid

摘要

Sorption experiments of ~(237)Np(V)O_2~+, ~(238)Pu(IV)~(4+) and ~(241)Am(III)~(3+) onto soils in the presence of humic acid have been performed by a batch system, in order to clarify effects of humic acid on sprition of the radionuclides on soils. Soils used in the present experiments were a coastal sand which does not sorb humic acid, and an ando soil which sorbs humic acid very well and is known to have a high content of humic substances.