Reduction of Se(IV) in Boom Clay: XAS Solid Phase Speciation

被引：26

作者：

Breynaert, Eric ^{[1
]}

Scheinost, Andreas C. ^{[1
]}

Dom, Dirk ^{[1
]}

Rossberg, Andre ^{[2
]}

Vancluysen, Jacqueline ^{[1
]}

Gobechiya, Elena ^{[1
]}

Kirschhock, Christine E. A. ^{[1
]}

Maes, Andre ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Ctr Surface Chem & Catalysis, Dept M2S, B-3001 Leuven, Belgium

[2] Forschungszentrum Dresden Rossendorf, D-01314 Dresden, Germany

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2010年 / 44卷 / 17期

关键词：

TRANSFORMATION FACTOR-ANALYSIS; SELENITE REDUCTION; HUMIC SUBSTANCES; FACTOR LOADINGS; ERROR; SPECTROSCOPY; OXIDATION; PRODUCTS; MINERALS; SELENATE;

D O I：

10.1021/es100569e

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The geochemical fate of selenium is of key importance for today's society due to its role as a highly toxic essential micronutrient and as a significant component of high level radioactive waste (HLRW) originating from the operation of nuclear reactors. Understanding and prediction of the longterm behavior of Se in natural environments requires identification of the in situ speciation of selenium. This article describes an XAS-based investigation into the solid phase speciation of Se upon interaction of Se(IV) with Boom Clay, a reducing, complex sediment selected as model host rock for clay-based deep geological disposal of HLRW in Belgium and Europe. Using a combination of long-term batch sorption experiments, linear combination XANES analysis and ITFA-based EXAFS analysis allowed for the first time to identify Se as the dominant solid phase speciation of Se in Boom Clay systems equilibrated with Se(lV).

引用

页码：6649 / 6655

页数：7

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