Selenium and Chromium Stable Isotopes and the Fate of Redox-Active Contaminants in the Environment
type: CreativeWork
description: 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.
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.
author: Ellis, Andre Savio
language: eng
keywords: Environmental Sciences
date published: 2015-09-28T15:12:28Z
date modified: 2026-07-22T22:26:27Z
provider: University of Illinois - Urbana-Champaign
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Illinois at Urbana-Champaign

PropertyValue
property ID: Handle
value: http://hdl.handle.net/2142/86523