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E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/53092851 Title: Comparison of vacuum and centrifuge-based techniques for evaluating solute transport processes under unsaturated conditions Author: Jessica Maria Hutchison Publisher: 2002. OCLC:53092851

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Comparison of vacuum and centrifuge-based techniques for evaluating solute transport processes under unsaturated conditions

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Comparison of vacuum and centrifuge-based techniques for evaluating solute transport processes under unsaturated conditions

Author:	Jessica Maria Hutchison
Publisher:	2002.
Edition/Format:	eBook : Thesis/dissertation : English
Summary:	Most subsurface contamination passes through the unsaturated zone before reaching an aquifer; however, many transport studies are conducted under saturated conditions that may not approximate the natural system. Chromate migration was measured in sediment from the Savannah River Site, SC under different water contents using vacuum and centrifuge techniques to obtain a steady-state flow regime. Leaching solutions cont Read more... Most subsurface contamination passes through the unsaturated zone before reaching an aquifer; however, many transport studies are conducted under saturated conditions that may not approximate the natural system. Chromate migration was measured in sediment from the Savannah River Site, SC under different water contents using vacuum and centrifuge techniques to obtain a steady-state flow regime. Leaching solutions contained 0.5 or 1.0 mM Cr(VI) and tritium in artificial groundwater. Breakthrough curves were modeled using CXTFIT assuming equilibrium conditions. Dispersion, as indicated by Peclet number, increased with decreasing water content. Retardation increased with decreasing water content with no trend evident when Kd was calculated from R. Average Kd of all Cr(VI) experiments was 0.551 mL ... g -1, similar to Kd derived from batch equilibration (0.599 mL ... g -1). Though results in both systems were similar, experiment duration in the vacuum system was 4 to 23 times longer than in the centrifuge system at comparable water contents.
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Material Type:	Thesis/dissertation, Internet resource
Document Type:	Internet Resource
All Authors / Contributors:	Jessica Maria Hutchison Find more information about:
OCLC Number:	53092851
Notes:	Directed by David E. Radcliffe. Includes an article submitted to Vadose zone journal.
Description:	xi, 108 leaves : ill.
Responsibility:	by Jessica Maria Hutchison.

Abstract:

Most subsurface contamination passes through the unsaturated zone before reaching an aquifer; however, many transport studies are conducted under saturated conditions that may not approximate the natural system. Chromate migration was measured in sediment from the Savannah River Site, SC under different water contents using vacuum and centrifuge techniques to obtain a steady-state flow regime. Leaching solutions contained 0.5 or 1.0 mM Cr(VI) and tritium in artificial groundwater. Breakthrough curves were modeled using CXTFIT assuming equilibrium conditions. Dispersion, as indicated by Peclet number, increased with decreasing water content. Retardation increased with decreasing water content with no trend evident when Kd was calculated from R. Average Kd of all Cr(VI) experiments was 0.551 mL ... g -1, similar to Kd derived from batch equilibration (0.599 mL ... g -1). Though results in both systems were similar, experiment duration in the vacuum system was 4 to 23 times longer than in the centrifuge system at comparable water contents.

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Comparison of vacuum and centrifuge-based techniques for evaluating solute transport processes under unsaturated conditions

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