University of Illinois Urbana-Champaign

Selenium and Chromium Stable Isotopes and the Fate of Redox-Active Contaminants in the Environment

Ellis, Andre Savio

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Description

Title
Selenium and Chromium Stable Isotopes and the Fate of Redox-Active Contaminants in the Environment
Author(s)
Ellis, Andre Savio
Issue Date
2003
Doctoral Committee Chair(s)
Johnson, Thomas M.
Department of Study
Geology
Discipline
Geology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Environmental Sciences
Language
eng
Abstract
In the second part of this study, I developed the chromium stable isotope system as a biogeochemical indicator and monitoring tool. After initial work designing the techniques, I measured chromium stable isotope fractionation in laboratory experiments and natural waters. I observed that the products of Cr(VI) reduction had delta53Cr values that were 3.4 +/- 0.1‰ less than that of the reactant. The 53Cr/ 52Cr ratios in water samples from three chromium-contaminated sites ranged from 1.1‰ to 5.8‰, relative to the standard and indicate the extent of reduction, a critical process that renders toxic Cr(VI) immobile and less toxic. Finally, I show that Cr stable isotope fractionation during sorption on alumina and goethite in laboratory experiments is insignificant and variations in 53Cr/52Cr values can be used to determine extent of reduction in natural waters.
Graduation Semester
2003
Type of Resource
text
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http://hdl.handle.net/2142/86523

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