000008050 001__ 8050
000008050 005__ 20240124114257.0
000008050 0247_ $$2DOI$$a10.6083/f4752h32v
000008050 037__ $$aETD
000008050 245__ $$aElectrochemical characterization of iron minerals
000008050 260__ $$bOregon Health and Science University
000008050 269__ $$a2020
000008050 336__ $$aThesis
000008050 502__ $$bM.S.
000008050 502__ $$gEnvironmental Science and Engineering
000008050 520__ $$aThe mixed and variable valence of iron in magnetite (Fe(III)tet[Fe(II),Fe(III)]octO42? ) give this 202 mineral unique properties that make it an important participant in redox reactions in 203 environmental systems, but the variability in its stoichiometry and other physical properties 204 complicates the determination of its effective redox potential. To address this challenge, a robust 205 method was developed to prepare working electrodes with mineral powders of diverse 206 characteristics and agarose-stabilized pore waters of controlled composition. This second-207 generation powder-disk electrode (PDEv2) methodology was used to characterize the 208 electrochemical properties of magnetite samples from a wide variety of sources (lab-synthesized, 209 commercial, and magnetically separated from environmental samples) using a sequence of 210 complementary potentiometric methods: chronopotentiometry (CP), linear polarization resistance 211 (LPR), electrochemical impedance spectroscopy (EIS), and then linear sweep voltammetry 212 (LSV).
000008050 650__ $$aIron$$021036
000008050 650__ $$aElectrochemistry$$018281
000008050 6531_ $$aelectrochemical impedance spectroscopy
000008050 6531_ $$amagnetite
000008050 691__ $$aSchool of Medicine$$041369
000008050 692__ $$aDepartment of Environmental and Biomolecular Systems$$041414
000008050 7001_ $$aBradley, Miranda J.
000008050 8564_ $$94f97303f-3b88-4c2d-9700-11bf844e77b6$$s4251973$$uhttps://digitalcollections.ohsu.edu/record/8050/files/Bradley.Miranda.2020.pdf
000008050 905__ $$a/rest/prod/f4/75/2h/32/f4752h32v
000008050 909CO $$ooai:digitalcollections.ohsu.edu:8050$$pstudent-work
000008050 980__ $$aTheses and Dissertations