Study on the effect of inorganic colloid on the speciation of TRU nuclides

The author studied the colloid form of transuranic nuclides (237Np, 238Pu and 241Am) in the loessial groundwater and the reaction between these nuclides and two kinds of inorganic colloids. The results show that after 24 h and 48 h laying up, the fraction of 238Pu in the form of colloid plus suspension was 82%, 95%, respectively, and the 237Np was in ion forms in the groundwater of at test site China Institute for Radiation Protection. These nuclides can react with inorganic colloids. As the result, when bentonite loading colloid concentration is from 0 to 100 mg/L, the 237Np colloid fraction varied from 0 to 13%, and the colloid fraction of the mixed transuranic nuclides had slightly increased. When ferric hydroxide loading colloid exist, the fraction of colloid plus suspension of the mixed transuranic nuclides increased obviously