Dr. Chappaz is an Associate Professor at Central Michigan University
- Postdoctoral Researcher, University of California - Riverside, 2008-2011
- Ph.D., Aquatic Geochemistry, INRS-ETE, University of Quebec, 2008
- M.Sc., Chemistry and Microbiology of Water, Universities of Poitiers and Pau, 2002
- B.Sc., Chemistry, University of Joseph Fourier, 2001
Research InterestsMy research interests aim to characterize the processes controlling the fate and reactivity of trace elements within modern and ancient aquatic systems. My expertize focuses on determining trace metal speciation by either using chromatography techniques coupled with inductively coupled plasma mass spectrometry (for natural waters) or X-ray Absorption Fine Structure (XAFS) spectroscopy at synchrotron national facilities (for sediment and rock samples)
My on-going funded projects are designed to answer crucial questions related to the molecular geochemistry of trace elements in both modern and ancient aquatic environments. My research program consists in two approaches: (1) a paleo angle that deals with developing paleo redox-proxies used to study how, when and why the oxygen content in ancient oceans changed through geologic time; (2) a modern aspect tailored to identify pollution sources and predict trace metal toxicity, that contributes to reduce the impact of human activities on biogeochemical cycles in modern lakes and oceans.
- Nedrich, S.M.,
Chappaz, A., Hudson, M.L., Brown, S.S and Burton, A.G. Jr. (2018) Biogeochemical controls on the speciation and aquatic toxicity of Vanadium and other metals in sediments from a river reservoir. Science of the Total Environment. 612, 313-320.
- Taylor, M.A., Hendy, I.L. and
Chappaz, A. (2017) Assessing oxygen depletion in the Northeastern Pacific Ocean during the last deglaciation using I/Ca ratios from multiple benthic foraminiferal species.
Paleoceanography. DOI: 10.1002/2016PA003062. .
- Wagner, M.,
Chappaz, A. and Lyons, T.W. (2017) Molybdenum speciation and burial pathway in weakly sulfidic environments: Insights from XAFS. Geochimica et Cosmochimica Acta. 206, 18-29. Ardakani, O.H.‡, Chappaz, A.‡, Sanei, H. and Mayer. B. (2016) Effect of thermal maturity on remobilization of molybdenum in black shales.
Earth and Planetary Science Letters. 449, 311-320. ‡Joint first authors. .
- Tessin, A., Sheldon, N.D., Hendy, I and
Chappaz, A. (2016) Iron limitation in the Western Interior Seaway during the Late Cretaceous OAE 3 and its role in phosphorus recycling and enhanced organic matter preservation.
Earth and Planetary Science Letters. 449, 135-144. .
- Vorlicek, T.P. ‡,
Chappaz, A‡, Groskreutz, L.M.*, Young, N. and Lyons. T.W. (2015) A new analytical approach to determining Mo and Re speciation in sulfidic waters.
Chemical Geology. 403, 52-57. ‡Joint first authors. .
Chappaz, A., Lyons, T.W., Gregory, D.D., Reinhard, C.T., Gill, B.C., Chao, L. and Large, R.R. (2014) Does pyrite act as an important host for molybdenum in modern and ancient euxinic sediments?
Geochimica et Cosmochimica Acta. 126: 112-122. .
- Dahl, T.W.‡,
Chappaz, A.‡, Fitts, J.P. and Lyons, T.W. (2013) Molybdenum reduction in a sulfidic lake: Evidence from X-Ray Absorption Fine-Structure Spectroscopy.
Geochimica et Cosmochimica Acta. 103: 213-231. ‡Joint first authors.