Multi-parameter Experimental Adsorption Effect of ~(239)Pu on Phyllitic Slate and Clay

摘要

The paper studies the adsorption features of ~(239)Pu in phyllitic slate and clay media through static experiment method. The two different geo-media were collected from a site for disposing very low level waste (VLLW) as experimental samples. Experimental results have shown that an adsorption equilibrium time of ~(239)Pu in phyllitic slate and clay is approximately 10 days, and the adsorption coefficient (K_d) values of phyllitic slate and clay are about 6000ml/g and 2700ml/g, respectively. The experimental result of particle size effect indicates when adsorption of plutonium in particle samples increases, the K_d values of these two geo-media increase while the particles decrease in size. And the experimental impact on aqueous phase pH value reveals that K_d of ~(239)Pu increases at higher aqueous phase pH value, illustrating stronger adsorption capacity. Experimental data are also measured through the curve fitting, K_d values are thus obtained theoretically.