Transport of bacterial probes in the subsurface; physicochemical and biological factors, or "colloids wouldn't do that!"

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Authors:Johnson, William P.; Zhang, Pengfei; McIntosh, William O.; Scheibe, Timothy D.; Onstott, Tullis C.; Fuller, Mark E.; Dobbs, Fred C.; DeFlaun, Mary F.; Holben, William; Griffin, Timothy
Author Affiliations:Primary:
University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States
Pacific Northwest National Laboratory, United States
Princeton University, United States
Envirogen, United States
Old Dominion University, United States
University of Montana, United States
Golder Federal Associates, United States
Volume Title:Geological Society of America, 2002 annual meeting
Source:Abstracts with Programs - Geological Society of America, 34(6), p.156-157; Geological Society of America, 2002 annual meeting, Denver, CO, Oct. 27-30, 2002. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592
Publication Date:2002
Note:In English
Summary:Bacteria can be used as probes in combination with dissolved tracers to elucidate transport-related aquifer properties. For example, physical heterogeneity can be inferred by observing differential advection of bacteria (or other colloids) relative to dissolved tracers, as illustrated by field experiments conducted at Kamas and Fry Canyon, Utah. Bacterial breakthrough-elution curves also provide information regarding the processes that control bacterial loss from, and re-entrainment into, groundwater. A high-resolution bacterial tracking technique was used to focus on the low concentration portions of bacterial breakthrough and elution histories (initial breakthrough and extended tailing) during DOE-sponsored field transport experiments conducted at Oyster, Virginia. The rates of bacterial loss from, and re-entrainment into, groundwater were shown to be controlled by both physicochemical and biological factors during these relatively long duration-large scale field experiments. Physicochemical factors that operated during the transport experiments included variations in hydrodynamic shear (pore water velocity), and potentially included hydrodynamic collision between mobile and attached cells. Biological factors that influenced transport included heterogeneity in cell surface properties, as well as predation. An additional biological factor that potentially impacted transport was cell growth. Much remains to be understood regarding the above, and other, controls on bacterial transport. However, understanding these controls is important and necessary for a variety of reasons, such as the potential use of bacterial probes to assay properties of the subsurface, as well as the need to deliver bacteria with novel metabolic properties to specific subsurface locales.
Subjects:Aquifers; Colloidal materials; Controls; Factors; Ground water; High-resolution methods; Hydrodynamics; Metabolism; Physicochemical properties; Pollution; Pore water; Predation; Processes; Tracers; Transport; Velocity; Atlantic Coastal Plain; Northampton County Virginia; Oyster Virginia; United States; Utah; Virginia; Bacteria; Fry Canyon; Kamas Canyon
Coordinates:N370700 N373400 W0754000 W0760200
Record ID:2004033197
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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