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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Colloid diffusion in crystalline rock: An experimental methodology to measure diffusion coefficients and evaluate colloid size dependence
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Colloid diffusion in crystalline rock: An experimental methodology to measure diffusion coefficients and evaluate colloid size dependence

机译：胶体在结晶岩中的扩散：一种测量扩散系数和评估胶体尺寸依赖性的实验方法

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摘要

Colloids present high sorption for many solutes and are considered potential contaminant carriers in geological environments. Experimental quantitative data are required for an adequate description of colloid-mediated contaminant transport within natural media. In this study, a methodology applying the nuclear ion beam technique Rutherford Backscattering Spectrometry (RBS) was used to measure colloid diffusion in crystalline rock and to analyze the effects of colloid size. It was found that colloids diffused within granite, colloid diffusion being both size-dependent and size-limited. Smaller colloids showed faster diffusion while diffusion was hindered for larger colloids of 250 nm. The measured apparent diffusion coefficients (D-a) ranged from 7E-18 m(2)/S for 2 nm to 1.5E-18 m(2)/S for 100 nm colloids. These diffusion coefficients measured for gold colloids in granite are about five orders of magnitude lower than values found for weak or non-sorbing solutes, under the same experimental conditions. The experimental evidence of colloid diffusion in granite is described here for the first time. (c) 2007 Elsevier B.V. All rights reserved.
机译：胶体对许多溶质具有很高的吸附能力，被认为是地质环境中潜在的污染物载体。需要实验定量数据来充分描述胶体介导的污染物在天然介质中的迁移。在这项研究中，采用核离子束技术卢瑟福背散射光谱法（RBS）的方法用于测量胶体在结晶岩中的扩散并分析胶体尺寸的影响。发现胶体在花岗岩内扩散，胶体扩散既取决于尺寸又取决于尺寸。较小的胶体显示更快的扩散，而对于250 nm的较大胶体则阻止了扩散。测得的表观扩散系数（D-a）从2E的7E-18 m（2）/ S到100 nm胶体的1.5E-18 m（2）/ S。在相同的实验条件下，对花岗岩中金胶体测得的这些扩散系数比对弱或非吸附溶质的测定值低约五个数量级。本文首次描述了胶体在花岗岩中扩散的实验证据。 （c）2007 Elsevier B.V.保留所有权利。

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