Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales
Electroanalytical methods are widely applicable in a variety of scientific fields and have proven to be a useful tool for fundamental and applied scientific investigations involving redox reactions and species. Over the past decades, electrochemical methods have been increasingly applied to investig...
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ftunivdelaware:oai:udspace.udel.edu:19716/31988 2023-06-11T04:09:49+02:00 Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales Hudson, Jeffrey 2022-08-10T19:08:55Z application/vnd.openxmlformats-officedocument.wordprocessingml.document application/pdf https://udspace.udel.edu/handle/19716/31988 en eng University of Delaware https://login.udel.idm.oclc.org/login?url=https://www.proquest.com/dissertations-theses/application-electroanalytical-methods-investigate/docview/2715455213/se-2?accountid=10457 1356965676 https://udspace.udel.edu/handle/19716/31988 Electrochemistry Iron Ligands Mediated electrochemical Oxidation Voltammetry Thesis 2022 ftunivdelaware 2023-05-01T12:52:33Z Electroanalytical methods are widely applicable in a variety of scientific fields and have proven to be a useful tool for fundamental and applied scientific investigations involving redox reactions and species. Over the past decades, electrochemical methods have been increasingly applied to investigate environmental processes. Environmental applications of electrochemistry range from large-scale environmental monitoring to bench-top investigations of fundamental processes at a micro-scale. This dissertation primarily applies two analytical techniques, voltammetry and mediated electrochemical oxidation (MEO), to directly investigate in situ redox cycling in estuarine and lacustrine environments, and to probe iron complexation and redox dynamics with organic ligands in a controlled laboratory setting. ☐ Voltammetric microelectrodes were used in conjunction with a pump-profiling system to measure concentrations of redox-active species (O2, MnII, FeII, H2S) associated with a stratified water column in Chesapeake Bay. Electrochemical measurements of high vertical resolution were achieved in the water column with the pumping system, which was also used to measure other constituents. Microelectrodes displayed high precision and accuracy when compared with other sensors onboard a research vessel, and measurements from two separate years showed distinct redox zonation between bottom and surface waters that were influenced by freshwater inputs from tributaries. ☐ Voltammetric microelectrodes were then applied to Arctic lacustrine systems near Toolik Lake, AK to investigate the distribution of redox-active species (O2, MnII, FeII, FeIII-complexes) associated with terminal electron acceptors (TEA). High vertical resolution profiles of TEAs in Toolik Lake sediment pore waters and iron-rich seeps were paired with microbiological analysis of iron and carbon cycling bacteria. Results enable the interpretation of relationships between the location the distribution of TEAs, while gaining insight into the influence of TEAs and ... Thesis Arctic The University of Delaware Library Institutional Repository Arctic |
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The University of Delaware Library Institutional Repository |
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language |
English |
topic |
Electrochemistry Iron Ligands Mediated electrochemical Oxidation Voltammetry |
spellingShingle |
Electrochemistry Iron Ligands Mediated electrochemical Oxidation Voltammetry Hudson, Jeffrey Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales |
topic_facet |
Electrochemistry Iron Ligands Mediated electrochemical Oxidation Voltammetry |
description |
Electroanalytical methods are widely applicable in a variety of scientific fields and have proven to be a useful tool for fundamental and applied scientific investigations involving redox reactions and species. Over the past decades, electrochemical methods have been increasingly applied to investigate environmental processes. Environmental applications of electrochemistry range from large-scale environmental monitoring to bench-top investigations of fundamental processes at a micro-scale. This dissertation primarily applies two analytical techniques, voltammetry and mediated electrochemical oxidation (MEO), to directly investigate in situ redox cycling in estuarine and lacustrine environments, and to probe iron complexation and redox dynamics with organic ligands in a controlled laboratory setting. ☐ Voltammetric microelectrodes were used in conjunction with a pump-profiling system to measure concentrations of redox-active species (O2, MnII, FeII, H2S) associated with a stratified water column in Chesapeake Bay. Electrochemical measurements of high vertical resolution were achieved in the water column with the pumping system, which was also used to measure other constituents. Microelectrodes displayed high precision and accuracy when compared with other sensors onboard a research vessel, and measurements from two separate years showed distinct redox zonation between bottom and surface waters that were influenced by freshwater inputs from tributaries. ☐ Voltammetric microelectrodes were then applied to Arctic lacustrine systems near Toolik Lake, AK to investigate the distribution of redox-active species (O2, MnII, FeII, FeIII-complexes) associated with terminal electron acceptors (TEA). High vertical resolution profiles of TEAs in Toolik Lake sediment pore waters and iron-rich seeps were paired with microbiological analysis of iron and carbon cycling bacteria. Results enable the interpretation of relationships between the location the distribution of TEAs, while gaining insight into the influence of TEAs and ... |
format |
Thesis |
author |
Hudson, Jeffrey |
author_facet |
Hudson, Jeffrey |
author_sort |
Hudson, Jeffrey |
title |
Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales |
title_short |
Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales |
title_full |
Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales |
title_fullStr |
Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales |
title_full_unstemmed |
Application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales |
title_sort |
application of electroanalytical methods to investigate biogeochemical processes from global to molecular scales |
publisher |
University of Delaware |
publishDate |
2022 |
url |
https://udspace.udel.edu/handle/19716/31988 |
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Arctic |
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Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
https://login.udel.idm.oclc.org/login?url=https://www.proquest.com/dissertations-theses/application-electroanalytical-methods-investigate/docview/2715455213/se-2?accountid=10457 1356965676 https://udspace.udel.edu/handle/19716/31988 |
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