Recent studies by Crist et al. (2004)(2005) attempted to provide pore-scale insights into mechanisms responsible for controlling colloid transport in unsaturated porous media. However, their key observation of colloids being trapped at air–water–solid (AWS) contact lines relied on images obtained along surfaces that were open to the atmosphere and thus subject to evaporation. Our analyses using their procedure show that because of exposure to the atmosphere, evaporation-driven artifacts account for most of their observed colloid trapping at AWS contact lines. In the following analysis of their work, we show how evaporation resulted in colloid deposition at AWS...

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