Iodine species uptake by cement and CSH studied by I K-edge X-ray absorption spectroscopy

被引：38

作者：

Bonhoure, I ^{[1
]}

Scheidegger, AM ^{[1
]}

Wieland, E ^{[1
]}

Dähn, R ^{[1
]}

机构：

[1] Paul Scherrer Inst, Waste Management Lab, CH-5232 Villigen, Switzerland

来源：

RADIOCHIMICA ACTA | 2002年 / 90卷 / 9-11期

关键词：

cement; CSH; iodide; iodate; EXAFS; XANES;

D O I：

10.1524/ract.2002.90.9-11_2002.647

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The 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 L-3-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)O-3(-)) 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 (similar to 1.78 Angstrom) is maintained upon uptake by HCP and CSH. XANES further indicated that CSH is not the uptake-controlling phase in HCP.

引用

页码：647 / 651

页数：5

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