Transformations from triclinic to hexagonal birnessite at circumneutral pH induced through pH control by common biological buffers

Ling, Florence T.; Heaney, Peter J.; Post, Jeffrey E.; Gao, Xiang

doi:10.1016/j.chemgeo.2015.10.007

Title: Transformations from triclinic to hexagonal birnessite at circumneutral pH induced through pH control by common biological buffers

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Authors:

; Heaney, Peter J.; Post, Jeffrey E.; Gao, Xiang

Publication Date:: Sun Nov 01 00:00:00 EDT 2015

Sponsoring Org.:: USDOE

OSTI Identifier:: 1246576

Grant/Contract Number:: FG02-94ER14466

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Chemical Geology

Additional Journal Information:: Journal Name: Chemical Geology Journal Volume: 416 Journal Issue: C; Journal ID: ISSN 0009-2541

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Citation Formats


                    Ling, Florence T., Heaney, Peter J., Post, Jeffrey E., and Gao, Xiang. Transformations from triclinic to hexagonal birnessite at circumneutral pH induced through pH control by common biological buffers.  Netherlands: N. p., 2015. 
Web.  doi:10.1016/j.chemgeo.2015.10.007.

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                    Ling, Florence T., Heaney, Peter J., Post, Jeffrey E., & Gao, Xiang. Transformations from triclinic to hexagonal birnessite at circumneutral pH induced through pH control by common biological buffers.  Netherlands.  https://doi.org/10.1016/j.chemgeo.2015.10.007

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                    Ling, Florence T., Heaney, Peter J., Post, Jeffrey E., and Gao, Xiang. Sun .  
"Transformations from triclinic to hexagonal birnessite at circumneutral pH induced through pH control by common biological buffers".  Netherlands.  https://doi.org/10.1016/j.chemgeo.2015.10.007.

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@article{osti_1246576,

  title        = {Transformations from triclinic to hexagonal birnessite at circumneutral pH induced through pH control by common biological buffers},

  author       = {Ling, Florence T. and Heaney, Peter J. and Post, Jeffrey E. and Gao, Xiang},

  abstractNote = {},

  doi          = {10.1016/j.chemgeo.2015.10.007},

  journal      = {Chemical Geology},

  number       = C,

  volume       = 416,

  place        = {Netherlands},

  year         = {Sun Nov 01 00:00:00 EDT 2015},

  month        = {Sun Nov 01 00:00:00 EDT 2015}

}

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https://doi.org/10.1016/j.chemgeo.2015.10.007

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Transformations from triclinic to hexagonal birnessite at circumneutral pH induced through pH control by common biological buffers

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Because of their nanocrystallinity and high cation exchange capacities, birnessite phases can control the cycling of heavy metals in soils and groundwaters, and they also are implicated in the oxidation of transition metals in natural environments. Birnessite reactivity is determined by crystal structure and composition. Because birnessites typically are poorly crystalline, synchrotron-based absorption spectroscopy (EXAFS, XANES) often is utilized for structural characterization. For example, linear combination fitting (LCF) of X-ray absorption spectra typically is applied to quantify mixed triclinic and hexagonal birnessite phases. This approach is challenged, however, because the structures of the standards are not always plainly apparent. Moreover,more »« less
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