GEOC 53 |
| Christopher J. Daughney1, Liping Pang2, Steven D. Siciliano3, and Murray Close2. (1) Institute of Geological and Nuclear Sciences, PO Box 30368, Lower Hutt, New Zealand, (2) Environmental Science and Research, PO Box 29-181, Christchurch, New Zealand, (3) Department of Soil Science, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N5A8, Canada |
| Bacteria are present in virtually all near-surface fluid-rock systems, and their cell walls have high affinities for dissolved metals. Thus many laboratory studies have been conducted to quantify metal adsorption by bacteria under different conditions. The laboratory data are generally well described by surface complexation models (SCMs), but little is known about the applicability of such models to the field scale. In this study, we use a lab-derived SCM to predict metal co-transport with bacteria through a natural gravel aquifer. We also use a lab-derived SCM to predict the natural distribution of metal between the dissolved and particulate phases at the ecosystem scale, focussing on shallow acidic lakes and wetlands. In most cases, the laboratory-derived SCMs provide reasonable predictions of metal fate and transport at the field scale, but are limited primarily by their ability to match metal interactions with dissolved organic matter. |
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Colloid-Facilitated Transport of Contaminants in the Subsurface: The Life and Death of a Colloid
1:00 PM-5:20 PM, Monday, March 29, 2004 Marriott -- Marquis NW, Oral
Division of Geochemistry |