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Title: Ion Exchange Processes and Mechanisms in Glasses

Abstract

Plans for immobilizing low-activity radioactive tank wastes at the Hanford Site call for vitrification followed by shallow subsurface disposal. Water percolating through the disposal system will eventually react with the vitrified waste, releasing the encapsulated radionuclides. Consequently, it is important to understand the glass corrosion mechanisms that ultimately control the radionuclide release rate. One important reaction involves the exchange of alkali ions in the glass with H+ or H3O+ ions in water, which raises the pH in the disposal system and can enhance 99Tc release rates by 100X or more. The objective of this work is to develop an understanding of the processes and mechanisms controlling alkali ion exchange and to correlate the kinetics of the ion-exchange reaction with glass structural properties. The fundamental understanding of the ion-exchange process developed under this study is targeted at developing lower ion-exchange rate glasses that would remain durable at higher alkali waste loading.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab., Berkeley, CA (US); Pacific Northwest National Lab., Richland, WA (US)
Sponsoring Org.:
USDOE Office of Environmental Management (EM) (US)
OSTI Identifier:
829972
Report Number(s):
EMSP-60362-2000
R&D Project: EMSP 60362; TRN: US0404966
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CORROSION; GLASS; HYDROXIDES; ION EXCHANGE; KINETICS; RADIOISOTOPES; TANKS; VITRIFICATION; WASTES; WATER

Citation Formats

McGrail, B Peter, Baer, D R, Darab, J G, Icenhower, j p, and Shuh, D K. Ion Exchange Processes and Mechanisms in Glasses. United States: N. p., 2000. Web. doi:10.2172/829972.
McGrail, B Peter, Baer, D R, Darab, J G, Icenhower, j p, & Shuh, D K. Ion Exchange Processes and Mechanisms in Glasses. United States. doi:10.2172/829972.
McGrail, B Peter, Baer, D R, Darab, J G, Icenhower, j p, and Shuh, D K. Thu . "Ion Exchange Processes and Mechanisms in Glasses". United States. doi:10.2172/829972. https://www.osti.gov/servlets/purl/829972.
@article{osti_829972,
title = {Ion Exchange Processes and Mechanisms in Glasses},
author = {McGrail, B Peter and Baer, D R and Darab, J G and Icenhower, j p and Shuh, D K},
abstractNote = {Plans for immobilizing low-activity radioactive tank wastes at the Hanford Site call for vitrification followed by shallow subsurface disposal. Water percolating through the disposal system will eventually react with the vitrified waste, releasing the encapsulated radionuclides. Consequently, it is important to understand the glass corrosion mechanisms that ultimately control the radionuclide release rate. One important reaction involves the exchange of alkali ions in the glass with H+ or H3O+ ions in water, which raises the pH in the disposal system and can enhance 99Tc release rates by 100X or more. The objective of this work is to develop an understanding of the processes and mechanisms controlling alkali ion exchange and to correlate the kinetics of the ion-exchange reaction with glass structural properties. The fundamental understanding of the ion-exchange process developed under this study is targeted at developing lower ion-exchange rate glasses that would remain durable at higher alkali waste loading.},
doi = {10.2172/829972},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {6}
}

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