Quantifying the influence of humic acid adsorption on colloidal microsphere deposition onto iron-oxide-coated sand.

X. Yang, Raymond Flynn, F. Von Der Kammer, T. Hofmann

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    This article describes an approach for quantifying microsphere deposition onto iron-oxide-coated sand under the influence of adsorbed Suwannee River Humic Acid (SRHA). The experimental technique involved a triple pulse injection of model latex microspheres (microspheres) in pulses of (1) microspheres, followed by (2) SRHA, and then (3) microspheres, into a column filled with iron-coated quartz sand as a water-saturated porous medium. A random sequential adsorption model (RSA) simulated the gradual rise in the first (microsphere) breakthrough curve (BTC). Using the same model calibration parameters a dramatic increase in concentration at the start of the second particle BTC, generated after SRHA injection, could be simulated by matching microsphere concentrations to extrapolated RSA output. RSA results and microsphere/SRHA recoveries showed that 1 mg of SRHA could block 5.90 plus or minus 0.14 x 10^9 microsphere deposition sites. This figure was consistent between experiments injecting different SRHA masses, despite contrasting microsphere deposition/release regimes generating the second microsphere BTC.
    Original languageEnglish
    Pages (from-to)3498-3506
    Number of pages9
    JournalEnvironmental Pollution
    Issue number12
    Publication statusPublished - Oct 2010

    ASJC Scopus subject areas

    • Pollution
    • Health, Toxicology and Mutagenesis
    • Toxicology

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