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Synchrotron X-ray studies of heavy metal mineral-microbe interactions

  • G. E. Brown (a1) (a2), Y. Wang (a1) (a3), A. Gélabert (a1), J. Ha (a1), C. Cismasu (a1), G. Ona-Nguema (a1) (a3), K. Benzerara (a3), J. Miot (a3), N. Menguy (a3), G. Morin (a3), F. Juillot (a3), F. Guyot (a3), G. Calas (a3), F. Farges (a4), T. P. Trainor (a5), J. Gescher (a6), C. Cordova (a6) and A. M. Spormann (a6)...

The availability of analytical methods that utilize the very intense and bright X-rays from synchrotron radiation sources has fundamentally changed the way in which geoscientists, environmental scientists and soil scientists study complex environmental samples and decipher the chemical and biological processes that impact the speciation, transport and potential bioavailability of environmental toxins (Brown et al., 2006). Such samples are often mixtures of crystalline and amorphous phases in particle-sizes ranging from cm to nm, adsorbed metal ions and organic molecules, natural organic matter, microbial organisms, algae, plant materials and aqueous solutions. The processes that affect the chemical forms and environmental fate of contaminants in such mixtures range from surface adsorption, desorption, precipitation and dissolution reactions, often involving a combination of hydrolysis, ligand exchange and electron transfer, to biological interactions in which microbial organisms, algae or plants interact with mineral surfaces and environmental contaminants.

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Brown, G.E. Jr. and Sturchio, N.C. (2002) An overview of synchrotron radiation applications to low temperature geochemistry and environmental science. Reviews in Mineralogy and Geochemistry, 49, 1–115.
Brown, G.E. Jr., Calas, G. and Hemley, R.J. (2006) Scientific advances made possible by user facilities. Elements, 2, 9–14.
Gélabert, A., Wang, Y., Ha, J., Ona-Nguema, G., Bargar, J.R., Eng, P.J., Ghose, S.K., Spormann, A.M. and Brown, G.E. Jr., Parameters controlling trace metal sorption at biofilm/mineral interfaces. Part II: Long-period X-ray standing wave spectroscopy and thermodynamic modeling, (in prep.).
Ha, J., Gelabert, A., Wang, Y., Spormann, A.M. and Brown, G.E. Jr., Role of extracellular polymeric substances on metal complexation on Shewanella oneidensis. Thermodynamic modeling and EXAFS study. Environmental Science and Technology, (submitted).
Ha, J., Trainor, T.P., Farges, F. and Brown, G.E. Jr., Interaction of aqueous Zn(II) with hematite nano-and micro-particles: Part 1: EXAFS study of Zn(II) adsorption and precipitation. Langmuir, (submitted).
Miot, J., Morin, G., Ona-Nguema, G., Skouri-Panet, F., Ferard, C. Aubry, E., Briand, J., Guyot, F. and Brown, G.E. Jr., (2008) EXAFS study of arsenic speciation in Euglena gracili. exposed to arsenite. Environmental Science and Technology, (in press).
Morin, G., Ona-Nguema, G., Wang, Y., Menguy, N. Juillot, F., Proux, O., Guyot, F., Calas, G. and Brown, G.E. Jr., (2008) EXAFS analysis of arsenite and arsenate adsorption on maghemite. Environmental Science and Technology, (in press).
Wang, Y., Morin, G., Ona-Nguema, G., Menguy, N., Juillot, F., Aubry, E., Guyot, F., Calas, G. and Brown, G.E. Jr., (2008) Arsenite adsorption at the magnetite-water interface during aqueous precipitation of magnetite at neutral pH. Geochimica et Cosmochimica Ada, (in press).
Wang, Y., Gelabert, A., Ha, J., Ona-Nguema, G., Gescher, J., Cordova, C, Bargar, J.R., Rogers, J., Eng, P.J., Ghose, S.K., Choi, Y., Spormann, A.M. and Brown, G.E. Jr., Parameters controlling trace metal sorption at biofilm/mineral interfaces. Part I: Long-period X-ray standing wave and EXAFS study of the impact of Shewanella oneidensi. MR-1 biofilm coatings on Pb(II) and Zn(II) partitioning at alumina/water and hematite/water interfaces, (in prep.).
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Mineralogical Magazine
  • ISSN: 0026-461X
  • EISSN: 1471-8022
  • URL: /core/journals/mineralogical-magazine
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