Metal sorption on kaolinite

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A key issue in performance assessment of low-level radioactive waste sites is predicting the transport and retardation of radionuclides through local soils under a variety of hydrologic and geochemical conditions. Improved transport codes should include a mechanistic model of radionuclide retardation. The authors have been investigating metal sorption (Cs{sup +}, Sr{sup 2+}, and Ba{sup 2+}) on a simple clay mineral (kaolinite) to better understand the geochemical interactions of common soil minerals with contaminated groundwaters. These studies include detailed characterizations of kaolinite surfaces, experimental adsorption measurements, surface complexation modeling, and theoretical simulations of cation sorption. The aluminol edge (010) site has ... continued below

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9 p.

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Westrich, H.R.; Brady, P.V.; Cygan, R.T.; Nagy, K.L. & Anderson, H.L. March 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 11 times . More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

A key issue in performance assessment of low-level radioactive waste sites is predicting the transport and retardation of radionuclides through local soils under a variety of hydrologic and geochemical conditions. Improved transport codes should include a mechanistic model of radionuclide retardation. The authors have been investigating metal sorption (Cs{sup +}, Sr{sup 2+}, and Ba{sup 2+}) on a simple clay mineral (kaolinite) to better understand the geochemical interactions of common soil minerals with contaminated groundwaters. These studies include detailed characterizations of kaolinite surfaces, experimental adsorption measurements, surface complexation modeling, and theoretical simulations of cation sorption. The aluminol edge (010) site has been identified as the most likely site for metal sorption on kaolinite in natural solutions. Relative metal binding strengths decrease from Ba{sup 2+} to Sr{sup 2+} to Cs{sup +}, with some portion sorbed on both kaolinite edges and basal surfaces. Some Cs{sup +} also appears to be irreversibly sorbed on both sites. Molecular dynamics simulations suggest that Cs{sup +} is sorbed at aluminol (010) edge sites as an inner-sphere complex and weakly sorbed as an outer-sphere complex on (001) basal surfaces. These results provide the basis to understand and predict metal sorption onto kaolinite, and a framework to characterize sorption processes on more complex clay minerals.

Physical Description

9 p.

Notes

INIS; OSTI as DE97003785

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  • 18. annual DOE low-level radioactive waste management conference, Salt Lake City, UT (United States), 20-22 May 1997

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  • Other: DE97003785
  • Report No.: SAND--97-0660C
  • Report No.: CONF-970537--1
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 463578
  • Archival Resource Key: ark:/67531/metadc677625

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  • March 1, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • June 14, 2016, 9:09 p.m.

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Westrich, H.R.; Brady, P.V.; Cygan, R.T.; Nagy, K.L. & Anderson, H.L. Metal sorption on kaolinite, article, March 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc677625/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.