The sorption behavior of Np on the crushed granite media

In order to predict release and transport rates, it is essential to understand the chemical interaction of actinides under aqueous condition. We studied the batch experiment of sorption behavior of the237Np with some parameters of solution acidity contact time, and physicochemical properties of geomedia for understanding the interaction of dissolved neptunium with granite rock. The studies were carried out on two kinds of geomedia, freshed and weathered granite samples. In the experiment, we find that Np show different sorption behaviors on crushed granite with solution pH, contact periods and geomedium. It has been found that the distribution ratio of 237Np with geomedia was increased somewhat with increasing solution pH and contact period in the experiment. (author)