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Title: Iodide Sorption to Clays and the Relationship to Surface Charge and Clay Texture - 12356

Abstract

Iodine is assumed to behave conservatively in clay barriers around nuclear waste repositories and in natural sediments. Batch experiments tend to show little to no sorption, while in column experiments iodine is often retarded relative to tritiated water. Current surface complexation theory cannot account for negatively charged ion sorption to a negatively charged clay particle. Surface protonation and iodide sorption to clay minerals were examined using surface titrations and batch sorption experiments with a suite of clay minerals. Surface titrations were completed spanning a range of both pH values and ionic strengths. For reference, similar titrations were performed on pure forms of an Al-O powder. The titration curves were deconvoluted to attain the pKa distribution for each material at each ionic strength. The pKa distribution for the Al-O shows two distinct peaks at 4.8 and 7.5, which are invariant with ionic strength. The pKa distribution of clays was highly variable between the different minerals and as a function of ionic strength. Iodide sorption experiments were completed at high solid:solution ratios to exacerbate sorption properties. Palygorskite and kaolinite had the highest amount of iodide sorption and montmorillonite had the least. (authors)

Authors:
; ; ;  [1]
  1. Sandia National Laboratories, Albuquerque, NM 87185 (United States)
Publication Date:
Research Org.:
WM Symposia, 1628 E. Southern Avenue, Suite 9-332, Tempe, AZ 85282 (United States)
OSTI Identifier:
22293611
Report Number(s):
INIS-US-14-WM-12356
TRN: US14V1267115135
Resource Type:
Conference
Resource Relation:
Conference: WM2012: Waste Management 2012 conference on improving the future in waste management, Phoenix, AZ (United States), 26 Feb - 1 Mar 2012; Other Information: Country of input: France; 5 refs.
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; DISTRIBUTION; IODIDES; IODINE; KAOLINITE; MONTMORILLONITE; RADIOACTIVE WASTES; SEDIMENTS; SORPTION; SURFACES; TITRATION; TRITIUM OXIDES

Citation Formats

Miller, Andrew, Kruichiak, Jessica, Tellez, Hernesto, and Wang, Yifeng. Iodide Sorption to Clays and the Relationship to Surface Charge and Clay Texture - 12356. United States: N. p., 2012. Web.
Miller, Andrew, Kruichiak, Jessica, Tellez, Hernesto, & Wang, Yifeng. Iodide Sorption to Clays and the Relationship to Surface Charge and Clay Texture - 12356. United States.
Miller, Andrew, Kruichiak, Jessica, Tellez, Hernesto, and Wang, Yifeng. Sun . "Iodide Sorption to Clays and the Relationship to Surface Charge and Clay Texture - 12356". United States.
@article{osti_22293611,
title = {Iodide Sorption to Clays and the Relationship to Surface Charge and Clay Texture - 12356},
author = {Miller, Andrew and Kruichiak, Jessica and Tellez, Hernesto and Wang, Yifeng},
abstractNote = {Iodine is assumed to behave conservatively in clay barriers around nuclear waste repositories and in natural sediments. Batch experiments tend to show little to no sorption, while in column experiments iodine is often retarded relative to tritiated water. Current surface complexation theory cannot account for negatively charged ion sorption to a negatively charged clay particle. Surface protonation and iodide sorption to clay minerals were examined using surface titrations and batch sorption experiments with a suite of clay minerals. Surface titrations were completed spanning a range of both pH values and ionic strengths. For reference, similar titrations were performed on pure forms of an Al-O powder. The titration curves were deconvoluted to attain the pKa distribution for each material at each ionic strength. The pKa distribution for the Al-O shows two distinct peaks at 4.8 and 7.5, which are invariant with ionic strength. The pKa distribution of clays was highly variable between the different minerals and as a function of ionic strength. Iodide sorption experiments were completed at high solid:solution ratios to exacerbate sorption properties. Palygorskite and kaolinite had the highest amount of iodide sorption and montmorillonite had the least. (authors)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {7}
}

Conference:
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