Our group is interested in the mechanisms of transformation of
inorganic geochemical species in aquatic systems. Our objective is to quantify
the dynamic cycling of metals at redox transitions by
using a combination of field measurements, laboratory experiments with natural
samples, and mathematical modeling.
Our group is specialized in the development and application of
electrochemical techniques for in situ measurements in marine and freshwater
sediments. To quantify the dynamics of biogeochemical processes and decouple
biological from chemical processes, we conduct incubation experiments with
natural samples. Finally, we build and apply mathematical models to diagnose
our understanding of these processes using an inverse modeling approach.
Multifunctional
scanning nanoprobes for in situ analysis of chemical
processes at microbe/mineral interfaces
(National Science Foundation, CHE-BE: Instrumental Development for
Environmental Analysis)
The importance of
iron in the remineralization of organic matter in
estuarine and continental shelf sediments
(National Science
Foundation, CAREER Program in Chemical Oceanography)
Coupling communication technology with in situ voltammetric
analyzers for real time and unattended monitoring of biogeochemically
relevant chemical species
(National Science Foundation, CHE-BE: Instrumental Development for
Environmental Analysis)
Molecular mechanisms of soluble Fe(III) reduction by metal-reducing members of
the genus Shewanella (National Science
Foundation, Biogeosciences)
Promoting uranium immobilization by the activities of microbial phosphatases (Department of Energy, Office of Biological
and Environmental Research)
The role of
soluble organic-Fe(III) in the cycling of sulfur and
organic carbon in coastal marine sediments
(American Chemical Society, Petroleum Research Fund, New Faculty Award)
Redox cycling of arsenic in the sediments of
the
Modeling the cycling of trace metals in aquatic systems
In
situ electrochemical measurements at hydrothermal vents
Geochemical
cycling of trace metals in the water column of Paul Lake (MI)