Complexation and Transport Modeling of Natural Organic Matters with TRU nuclides considering their Heterogeneity

在真实的自然体系中存在着多种天然胶体。由于金属离子与天然胶体的总结合量与其与各胶体的结合量不成线性关系，传统结合模型中的加和概念不适用。特别是，它是一个问题，以发展的相互作用模型的吸附到金属（氢）氧化物和结合的金属离子与相对较大的分子，如腐殖酸（HA）。本研究测定了HA和针铁矿对Cu的吸附等温线，并与HA和针铁矿的吸附等温线进行了比较，讨论了HA在针铁矿上的吸附对Cu结合的影响。通过评估HA沿着吸附过程中的电荷调节，计算了HA在针铁矿表面的静电势，结果表明，Cu在HA/针铁矿复合物上的结合受质子对HA官能团的竞争减少和表面电位降低的影响。

Many kinds of natural colloids are present in real natural systems. The additive concept in conventional binding model are not available because the total binding amount of metal ions with total natural colloids are not linearly proportional with that with each colloids. Especially it is a problem to develop the interaction model of sorption onto metal (hydro) oxides and binding to metal ions with relatively large molecules such as humic acids (HA). In this year, we measure the sorption isotherm of Cu in the presence of both HA and goethite, compare it with the isotherms in the presence of HA or goethite, and discuss the effect of sorption of HA onto goethite on the binding of Cu.By evaluating the charge adjustment of HA along with its sorption onto goethite and calculating the electrostatic potentials near the surface of goethite in the presence of sorbed HA, we find that the binding of Cu on the complexes of HA/goethite is influenced by the decrease in competition ofproton to the functional groups of HA and the decrease in the surface potentials.