Research Projects

We have several projects underway looking at the redox chemistry of Fe minerals in the environment. Much of our effort has been focused on understanding the biogeochemical transformations of Fe oxides and clays under reducing conditions. Specifically, we have used 57-Fe Mössbauer spectroscopy and stable Fe isotope tracers to demonstrate Fe(II) catalyzed recrystallization of Fe oxides and clays. Recrystallization involves several steps including interfacial electron transfer between sorbed Fe(II) and structural Fe(III) and then significant mixing of aqueous Fe with bulk structural Fe. Our applied work is focused on contaminant fate, particularly with regards to chlorinated ethenes, uranium, mercury, and arsenic. Currently funded projects include:

Biologically Mediated Abiotic Reduction (BMAD) of Chlorinated Ethenes: A New Conceptual Framework
Strategic Environmental Research and Development Program (SERDP)
Michelle Scherer, David Cwiertny, Rula Deeb, Deepa Gandhi, Drew Latta, Anke Neumann

SusChEM: Collaborative Research: Influence of Fe2+-catalyzed recrystallization on Fe oxide reactivity and C stabilization
Michelle Scherer, Drew Latta, Aaron Thompson, Thomas Borch, Clark Johnson, Brian Beard

Stable Isotope Investigation of Fe Atom Exchange in Hematite
U.S. Department of Energy, Basic Energy Sciences, Pacific Northwest National Laboratory
Michelle Scherer and Kevin Rosso