Light transmission technique for the evaluation of colloidal transport and dynamics in porous media

Noam Weisbrod, Michael R. Niemet, John S. Selker

    Research output: Contribution to journalArticlepeer-review

    40 Scopus citations

    Abstract

    Colloidal transport in porous media has been typically studied in column experiments from which data analysis was limited to the evaluation of effluent breakthrough curves and/or destructive sampling at the end of the experiments. The internal processes occur within a "black box", where direct observation is not possible and therefore are often poorly understood. In this paper, a nondestructive, noninvasive method is presented that allows for quantitative measurement of colloid distribution with unprecedented two-dimensional spatial and temporal resolution. This technique is well-suited to observing the effects of saturation transitions and physical heterogeneities on colloidal transport. The potential of this novel technique is explored by investigating the effect of particle size and concentration on flow dynamics under saturated and unsaturated conditions. In saturated-flow experiments, deviation from the classical advection-dispersion behavior is observed. In unsaturated systems, colloidal accumulation at the capillary fringe interface and a high deposition rate of microspheres to the unsaturated media are readily observed. The experimental system is limited to translucent porous media and fluorescent colloids and is only semiquantitative in variably saturated media; nevertheless, it holds great promise for elucidating many complex mechanisms that control or influence colloid transport in the subsurface.

    Original languageEnglish
    Pages (from-to)3694-3700
    JournalEnvironmental Science and Technology
    Volume37
    Issue number16
    DOIs
    StatePublished - 15 Aug 2003

    ASJC Scopus subject areas

    • General Chemistry
    • Environmental Chemistry

    Fingerprint

    Dive into the research topics of 'Light transmission technique for the evaluation of colloidal transport and dynamics in porous media'. Together they form a unique fingerprint.

    Cite this