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Surface complexation studied via combined grazing-incidence EXAFS and surface diffraction: arsenate on hematite (0001) and (10–12)

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An Erratum to this article was published on 03 November 2006

Abstract

X-ray diffraction [crystal-truncation-rod (CTR)] studies of the surface structure of moisture-equilibrated hematite reveal sites for complexation not present on the bulk oxygen-terminated surface, and impose constraints on the types of inner-sphere sorption topologies. We have used this improved model of the hematite surface to analyze grazing-incidence EXAFS results for arsenate sorption on the c (0001) and r (10–12) surfaces measured in two electric vector polarizations. This work shows that the reconfiguration of the surface under moist conditions is responsible for an increased adsorption density of arsenate complexes on the (0001) surface relative to predicted ideal termination, and an abundance of “edge-sharing” bidentate complexes on both studied surfaces. We consider possible limitations on combining the methods due to differing surface sensitivities, and discuss further analysis possibilities using both methods.

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Acknowledgements

We are grateful to Corwin Booth for helpful discussions regarding GIXAFS and CTR disorder effects. Use of the APS and SSRL was supported by the US Department of Energy, Basic Energy Sciences, Office of Energy Research, under contracts W-31-109-Eng-38 and DE-AC03-76SF00515, respectively. GW is supported by the Office of Basic Energy Sciences through the division of Chemical Sciences, Geosciences and Biosciences through the Lawrence Berkeley National Laboratory. We also acknowledge grants BES-0404400 (TT, PE and GB), and NSF CHE-0431425 (GB and TT).

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Authors and Affiliations

  1. Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    G. Waychunas

  2. University of Alaska Fairbanks, Fairbanks, AK, 99775, USA

    T. Trainor

  3. CARS, Argonne National Laboratory, Argonne, IL, 60637, USA

    P. Eng

  4. Environmental Chemistry Division, Argonne National Laboratory, Argonne, IL, 60637, USA

    J. Catalano

  5. Stanford University, Stanford, CA, 94305, USA

    G. Brown

  6. US Geological Survey, Menlo Park, CA, 94025, USA

    J. Davis

  7. Stanford Synchrotron Radiation Laboratory, Stanford, CA, 94305, USA

    J. Rogers & J. Bargar

Authors
  1. G. Waychunas
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  2. T. Trainor
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  3. P. Eng
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  4. J. Catalano
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  5. G. Brown
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  6. J. Davis
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  7. J. Rogers
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  8. J. Bargar
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Corresponding author

Correspondence to G. Waychunas.

Additional information

An erratum to this article can be found at http://dx.doi.org/10.1007/s00216-006-0922-3

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Waychunas, G., Trainor, T., Eng, P. et al. Surface complexation studied via combined grazing-incidence EXAFS and surface diffraction: arsenate on hematite (0001) and (10–12). Anal Bioanal Chem 383, 12–27 (2005). https://doi.org/10.1007/s00216-005-3393-z

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  • DOI: https://doi.org/10.1007/s00216-005-3393-z

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