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本研究在低氧条件下,采用批式法测定了Pu在甘肃陇东黏土岩上的吸附分配比,并探讨了液固比和pH值对吸附分配比的影响。实验中Pu的初始浓度约为1×10-10 mol/L,用NaOH和HClO4调节溶液pH值,实验温度为(30±1)℃。定期取样,样品溶液经0.45μm的膜过滤后,取滤液,用低本底液闪谱仪测定液相中Pu的放射性活度。当溶液中钚的放射性活度基本不变时,认为吸附达到平衡。根据公式(1)计算Pu在黏土上的吸附分配比Kd。
In this study, the adsorption-distribution ratio of Pu on Claystone in eastern Gansu was determined by batch method under hypoxic conditions and the effect of liquid-solid ratio and pH on the adsorption-distribution ratio was discussed. The initial concentration of Pu in the experiment was about 1 × 10-10 mol / L. The pH of the solution was adjusted with NaOH and HClO4. The experimental temperature was (30 ± 1) ℃. Periodic sampling, the sample solution was filtered through a 0.45μm membrane, the filtrate was taken, with a low background liquid X-ray fluorescence spectrometry measured Pu radioactivity. When the radioactive activity of plutonium in solution is basically the same, it is considered that the adsorption is balanced. According to the formula (1) Pu calculated in the adsorption and distribution of clay Kd.