Grolimund Daniel, Borkovec Michal
Nuclear Energy and Safety Department, Waste Management Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
J Contam Hydrol. 2006 Oct 10;87(3-4):155-75. doi: 10.1016/j.jconhyd.2006.05.002. Epub 2006 Jul 17.
We study mobilization of colloidal particles from natural porous media, such as soils and groundwater aquifers. Extensive laboratory scale column experiments of particle release from four different subsurface materials are presented. The important characteristics of the release process are (i) its non-exponential kinetics, (ii) the finite supply of colloidal particles and (iii) the strong dependence of the release kinetic on the nature of the adsorbed cations. Particle release depends most sensitively on the relative saturation of the medium with divalent cations. We propose a mathematic model, which captures all these aspects quantitatively, and can be used to describe the coupling between transport of major cations and the release of colloidal particles. The present experimental investigations as well as the developed modeling framework represent an important step towards the understanding of colloid-facilitated transport phenomena in natural porous media.
我们研究了天然多孔介质（如土壤和地下含水层）中胶体颗粒的运移情况。文中展示了从四种不同地下材料中释放颗粒的大量实验室规模的柱实验。释放过程的重要特征包括：（i）其非指数动力学；（ii）胶体颗粒的有限供应；（iii）释放动力学对吸附阳离子性质的强烈依赖性。颗粒释放最敏感地取决于介质中二价阳离子的相对饱和度。我们提出了一个数学模型，该模型能定量地涵盖所有这些方面，并可用于描述主要阳离子的运移与胶体颗粒释放之间的耦合关系。目前的实验研究以及所开发的建模框架是朝着理解天然多孔介质中胶体促进运移现象迈出的重要一步。
