Modeling ion exchange in clinoptilolite using the EQ3/6 geochemical modeling code

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Assessing the suitability of Yucca Mtn., NV as a potential repository for high-level nuclear waste requires the means to simulate ion-exchange behavior of zeolites. Vanselow and Gapon convention cation-exchange models have been added to geochemical modeling codes EQ3NR/EQ6, allowing exchange to be modeled for up to three exchangers or a single exchanger with three independent sites. Solid-solution models that are numerically equivalent to the ion-exchange models were derived and also implemented in the code. The Gapon model is inconsistent with experimental adsorption isotherms of trace components in clinoptilolite. A one-site Vanselow model can describe adsorption of Cs or Sr on ... continued below

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5 p.

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Viani, B.E. & Bruton, C.J. June 1, 1992.

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Assessing the suitability of Yucca Mtn., NV as a potential repository for high-level nuclear waste requires the means to simulate ion-exchange behavior of zeolites. Vanselow and Gapon convention cation-exchange models have been added to geochemical modeling codes EQ3NR/EQ6, allowing exchange to be modeled for up to three exchangers or a single exchanger with three independent sites. Solid-solution models that are numerically equivalent to the ion-exchange models were derived and also implemented in the code. The Gapon model is inconsistent with experimental adsorption isotherms of trace components in clinoptilolite. A one-site Vanselow model can describe adsorption of Cs or Sr on clinoptilolite, but a two-site Vanselow exchange model is necessary to describe K contents of natural clinoptilolites.

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5 p.

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INIS; OSTI as DE92017439

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  • 7. water-rock interaction conference, Park City, UT (United States), 9-23 Jul 1992

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  • Other: DE92017439
  • Report No.: UCRL-JC--109952
  • Report No.: CONF-920761--14
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 140753
  • Archival Resource Key: ark:/67531/metadc626324

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  • June 1, 1992

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 17, 2016, 2:32 p.m.

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Viani, B.E. & Bruton, C.J. Modeling ion exchange in clinoptilolite using the EQ3/6 geochemical modeling code, article, June 1, 1992; California. (digital.library.unt.edu/ark:/67531/metadc626324/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.