Author:
Bonhoure I.,Scheidegger A. M.,Wieland E.,Dähn R.
Abstract
SummaryThe uptake of iodine species (I−/IO3−) by HCP (hardened cement paste) and a CSH (calcium silicate hydrate) phase under highly alkaline conditions has been investigated using X-ray absorption spectroscopy (XAS). The study was performed at the I K-edge (33.169 keV) instead of the I L3-edge (4.557 keV) to avoid interference with Ca (K-edge=4.038 keV), a major element in HCP and CSH phases. The XANES (X-rays absorption near-edge structure) spectra revealed no changes in the formal oxidation state of iodide (I(-I)−) and iodate (I(V)O3−) upon uptake by HCP and CSH. The EXAFS (extended X-ray absorption fine structure) oscillations from I−treated HCP and CSH samples were found to be extremely weak, limiting interpretation of the EXAFS data. The IO3−EXAFS spectra showed that the IO3−entity consisting of three oxygen atoms with a characteristic I-O distance (∼1.78 Å) is maintained upon uptake by HCP and CSH. XANES further indicated that CSH is not the uptake-controlling phase in HCP.
Subject
Physical and Theoretical Chemistry
Reference15 articles.
1. Thermody - namic Modelling of Blended Cements at Elevated Temperatures;Atkins;DoE,1993
2. Iodine sorption onto mixed solid alumina cement and calcium compounds;Toyohara;Nucl Sci Technol,2000
3. Sorption of iodine on minerals investigated by - ray absorption near edge structure tracer sorption experiments;Fuhrmann;Appl Geochem,1998
4. A Thermodynamic Model for Blended Cement;Atkins;DoE,1991
5. Interaction of Eu ( III ) and Th ( IV ) with sulphate - resisting portland cement Personal communication;Wieland;Mat Res Soc Symp Proc,1998
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