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773115293

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Through-diffusion and out-diffusion are good way to understand anion diffusion behavior in compacted bentonite. In the present work we investigated Re(VII) and Se(IV) diffusion behavior in 2000 kg/m3 compacted GMZ bentonite. The De values of Re(VII) and Se(IV) are 0.29 ± 0.02 and 0.77 ± 0.05× 10-11 m2/s. The result obtained from out-diffusion method was not agreed with predicted data due to the heterogeneous porosity distribution in clay boundaries and species changed when the diffusion occurred in GMZ bentonite. Comparing the Da values of Se, Tc and I in GMZ and Kunigel-F bentonites, it showed that Kunigel-F bentonite hindered the mobilities of anion more efficiently than GMZ bentonite because of the higher content of montmorillonite.

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jiangguofeng

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773115293: 金币+20, 翻译EPI+1, ★★★★★最佳答案, 谢谢!!!!! 2015-10-12 09:27:46
贯穿-扩散和外扩散是了解阴离子在夯实的膨润土中扩散行为的好方法。在本研究中我们调查了Re (VII)和Se (IV)于2000 kg/m3夯实的GMZ膨润土中的扩散行为。Re (VII)和Se (IV)的De值为0.29?0.02和0.77?0.05?10 -11 m2/秒。通过外扩散方法得到的结果与预测数据不相符是由于在GMZ膨润土中发生扩散时粘土边缘和试样中的非均一孔隙度分配发生了变化。通过Se、Tc和I于GMZ和Kunigel-F膨润土中的Da值的比较表明由于较高的蒙脱石含量,Kunigel-F膨润土比GMZ膨润土更有效率地阻碍了阴离子的流动性。
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