Iodide uptake Onto clay minerals and the relationship to fixed charge

Andrew Miller, Jessica Kruichiak, Melissa Mills, Hemesto Tellez, Yifeng Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Clay minerals are likely candidates to aid in nuclear waste isolation due to their low permeability, favorable swelling properties, and high cation sorption capacities. Iodine-129 is often the major driver of exposure risk from nuclear waste repositories at timescales > 10, 000 years. Therefore, understanding the geochemical cycling of iodine in clays is critical in developing defensible quantitative descriptions of nuclear waste disposal. Seven different clay minerals have been examined using several techniques to characterize the surface charge environment and iodide uptake. The use of a series of clays shifts the independent variable away from water chemistry characteristics (pH, contaminant concentration), and toward structural characteristics of clay minerals including isomorphous substitution and clay texture. Iodide uptake batch experiments were completed with the clay minerals in a range of swamping electrolytes. The results give evidence for a novel uptake mechanism involving ion pair formation and iodide concentration within nano-confined environments.

Original languageEnglish (US)
Title of host publication14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013
Subtitle of host publicationIntegrating Storage, Transportation, and Disposal
Pages218-225
Number of pages8
StatePublished - 2013
Event14th International High-Level Radioactive Waste Management Conference: Integrating Storage, Transportation, and Disposal, IHLRWMC 2013 - Albuquerque, NM, United States
Duration: Apr 28 2013May 2 2013

Publication series

Name14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013: Integrating Storage, Transportation, and Disposal
Volume1

Other

Other14th International High-Level Radioactive Waste Management Conference: Integrating Storage, Transportation, and Disposal, IHLRWMC 2013
CountryUnited States
CityAlbuquerque, NM
Period4/28/135/2/13

ASJC Scopus subject areas

  • Waste Management and Disposal

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  • Cite this

    Miller, A., Kruichiak, J., Mills, M., Tellez, H., & Wang, Y. (2013). Iodide uptake Onto clay minerals and the relationship to fixed charge. In 14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013: Integrating Storage, Transportation, and Disposal (pp. 218-225). (14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013: Integrating Storage, Transportation, and Disposal; Vol. 1).