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Sorption and diffusion are important processes for the transport of radionuclides through geomedia from a radioactive disposal facility.In this study, batch tests and through-diffusion experiments were performed to investigate the sorption and diffusion of Se(IV) in crushed granite. Different column lengths of 2, 4 and 8, were employed in the through-diffusion experiments to study the effect of the column length on the apparent diffusion coefficients. Synthetic groundwater (GW) and synthetic seawater (SW) were the liquid phases in these experiments. A two-site kinetic linear model and the Freundlich isotherm were applied to match the sorption/desorption batch data quite closely for both of GW and SW conditions. The retardation factors (Rf) were estimated by comparing the breakthrough curve of Se(IV) with that of HTO. Experimental results indicated that whether in GM or SW solution, the column lengths did not significantly affected Da or Rf of Se in crushed granite. |
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| 吸附和扩散是放射性核素通过放射活性处理设施的土地介质传播的重要过程。本研究通过批量试验和透过扩散实验探讨Se(IV)在花岗岩碎石中的吸附和扩散。透过实验采用长度分别为2,4和8的柱以研究柱长对表观扩散系数的影响。人工地下水(GW)和人工海水(SW)在这些实验中作为液相。两点动态线性模型和弗罗因德利希等温线与GW和SW条件下的吸附/脱吸附批量数据均达到良好匹配。通过比较从Se(IV)与从HTO得到的穿透曲线估算滞留因子(Rf)。实验结果表明，无论在GM还是SW溶液，柱长度对Se的Da或Rf均无显著影响。 |
2楼2015-12-05 05:07:16