Diffusion of Eu(III) in compacted bentonite-effect of pH, solution concentration and humic acid.

Wang X; Chen Y; Wu Y

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Diffusion of Eu(III) in compacted bentonite-effect of pH, solution concentration and humic acid.

机译：Eu（III）在压实膨润土中的pH，溶液浓度和腐殖酸的扩散。

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The effect of pH, Eu(III) solution concentration and humic acid on the diffusion of Eu(III) in compacted bentonite ( [Formula: see text] kg/m(3)) was studied with "in-diffusion" method at an ionic strength of 0.1M NaClO(4). The results ( [Formula: see text] values from the first slice and theoretical calculation, apparent and effective diffusion coefficients) derived from the new capillary method are in good agreement with the literature data under similar conditions, and fit the Fick's second law very well. The results suggest that the diffusion of Eu(III) is dependent on pH values and independent on solution concentration in our experimental conditions. Humic acid forms precipitation/complexation with Eu(III) at the surface of compacted bentonite and thus deduces the diffusion/transport of Eu(III) in compacted bentonite. The [Formula: see text] values in compacted bentonite are in most cases lower than those in powdered bentonite obtained from batch experiments. The difference between the [Formula: see text] values from powdered and compacted bentonite is a strong function of the bulk density of the bentonite. The results suggest that the content of interlaminary space plays a very important role to the diffusion, sorption and migration of Eu(III) in compacted bentonite.

机译：采用“扩散”方法研究了pH，Eu（III）溶液浓度和腐殖酸对压实膨润土中Eu（III）扩散的影响（公式：参见kg / m（3））。离子强度为0.1M NaClO（4）。新毛细管法得到的结果（第一部分的值和理论计算值，表观和有效扩散系数）与相似条件下的文献数据非常吻合，非常符合菲克第二定律。结果表明，在我们的实验条件下，Eu（III）的扩散取决于pH值，并且与溶液浓度无关。腐殖酸在压实膨润土表面与Eu（III）形成沉淀/络合，从而推导了Eu（III）在压实膨润土中的扩散/迁移。在大多数情况下，压实膨润土的[配方：见正文]值低于通过分批实验获得的膨润土粉末。膨润土粉末和压实膨润土的[配方：见正文]值之间的差异是膨润土堆积密度的强大函数。结果表明，层间空间的含量对压实膨润土中Eu（III）的扩散，吸附和迁移起着非常重要的作用。

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《Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine》 |2004年第6期|共7页
作者
Wang X; Chen Y; Wu Y;
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正文语种 eng
中图分类特种医学;
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Diffusion; Concentration; Solutions; Hydrogen-Ion Concentration; Acids; 扩散; 溶液; 氢离子浓度; 酸类;

机译：Diffusion;Concentration;Solutions;Hydrogen-Ion Concentration;Acids;扩散;溶液;氢离子浓度;酸类;

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1. Diffusion of Eu(III) in compacted bentonite-effect of pH, solution concentration and humic acid. [J] . Wang X, Chen Y, Wu Y Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine . 2004,第6期

机译：Eu（III）在压实膨润土中的pH，溶液浓度和腐殖酸的扩散。
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Diffusion of Eu(III) in compacted bentonite-effect of pH, solution concentration and humic acid.

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