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Colloid-facilitated transport of radium and thorium in the Memphis Aquifer, Memphis,
Tennessee, U.S.A.
By
Vincent Michael Todd
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(Earth Sciences)
May 2013
Copyright 2013 Vincent Michael Todd
Object Description
| Title | Colloid-facilitated transport of radium and thorium in the Memphis Aquifer, Memphis, Tennessee, U.S.A. |
| Author | Todd, Vincent Michael |
| Author email | vtodd808@gmail.com;vtodd808@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Geological Sciences |
| School | College of Letters, Arts And Sciences |
| Date defended/completed | 2012-10-11 |
| Date submitted | 2013-05-13 |
| Date approved | 2013-05-13 |
| Restricted until | 2013-05-13 |
| Date published | 2013-05-13 |
| Advisor (committee chair) | Ku, Teh-Lung |
| Advisor (committee member) |
Hammond, Douglas Meshkati, Najmedin |
| Abstract | The significance of groundwater colloidal transport was examined in the context of the Memphis Aquifer (Memphis, Tennessee) in the vicinity of the Sheahan well field. The hydrological and geochemical characteristics of the Memphis Aquifer were characterized using U- and Th-series isotopes in conjunction with environmental parameters. Ground water flows from source areas associated with elevated α-recoil rates to sinks where isotopes become highly retarded and are eventually removed via municipal ground water production. Distribution coefficients (K) calculated for the dissolved/stationary (Ra only, according to Luo et al (2000)) and dissolved/colloid systems (Ra and Th) are significantly lower than other reported values in the literature. While colloidal association of thorium and radium varied from <0.1% up to 75%, the degree of association with the colloid phase was hindered by the lack of Mn-oxides. A correlation between radium retardation and increased iron concentrations was found to be counter-intuitive, until the role of iron-reducing microbiology was considered. Retardation of radium is correlated not with the presence of ferrihydrite, but with organic matter instead. Increased ferrous iron concentrations serve as a proxy for microbial activity. |
| Keyword | colloids; thorium; radium; groundwater; groundwater transport; adsorption; Memphis Aquifer |
| Language | English |
| Format (imt) | application/pdf |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Contributing entity | University of Southern California |
| Rights | Todd, Vincent Michael |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Filename | etd-ToddVincen-1686.pdf |
| Archival file | uscthesesreloadpub_Volume7/etd-ToddVincen-1686.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Full text | Colloid-facilitated transport of radium and thorium in the Memphis Aquifer, Memphis, Tennessee, U.S.A. By Vincent Michael Todd A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (Earth Sciences) May 2013 Copyright 2013 Vincent Michael Todd |
