Radionuclide Sorption to Rocks and Minerals: Effects of pH and Inorganic Anions. Part 2. Sorption and Speciation of Selenium

Fujikawa, Yoko; Fukui, Masami

doi:10.1524/ract.1997.76.3.163

Cited by 26 publications

(22 citation statements)

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“…X-ray photoelectron spectroscopy [4] and XAS [11,[26][27] studies revealed the absence of Se(IV) reduction during the sorption onto Fe3O4 nanoparticles, and Loyo et al [27] showed that magnetite cannot reduce Se(IV) in basic solutions, since its redox potential is more positive than that of selenite. In contrast, some studies have strongly suggested that Se(IV) can be reduced by Fe(II) included in green rust [28], magnetite, mackinawite and siderite [29], pyrite [30], and troilite [31].…”

Section: Behaviors Of Selenium Ions In Solution Contained Iron and Irmentioning

confidence: 99%

Estimation of the Behaviors of Selenium in the Near Field of Repository

Kim¹,

Min²,

Baik³

et al. 2012

Nuclear Engineering and Technology

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Section: Behaviors Of Selenium Ions In Solution Contained Iron and Irmentioning

confidence: 99%

Estimation of the Behaviors of Selenium in the Near Field of Repository

Kim¹,

Min²,

Baik³

et al. 2012

Nuclear Engineering and Technology

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“…Most of the Se sorbed onto the sedimentary rock was determined to be Se(0) by X-ray absorption near-edge structural (XANES) analysis, and the sorption mechanism was explained as incorporation into pyrite as ) Fig. 4 Comparison of K d for minerals obtained in this study and previously reported ones ((a) biotite, 7,12) (b) chlorite, 7,12) (c) montmorillonite, 7) (d) goethite, 7,9) (e) calcite, 10,12) and (f) pyrite 7,8) )…”

Section: Sorption Behavior Onto Mineral Samplesmentioning

confidence: 74%

“…The K d values obtained for granodiorite were compared to previously reported ones for granite or granodiorite [10][11][12]33) ( Fig. 7).…”

Section: Sorption Behavior Onto Rock Samples (1) Granodioritementioning

confidence: 80%

“…The K d values obtained for sandy mudstone were compared to previously reported ones for mudstone and shale 10,[14][15][16] (Fig. 8).…”

Section: Sorption Behavior Onto Rock Samples (1) Granodioritementioning

confidence: 85%

“…Although a considerable amount of Se sorption data has been obtained under aerobic conditions, [7][8][9][10][11][12][13][14] where selenite and selenate species are dominant, the data obtained under reducing conditions are limited. [12][13][14][15][16] In particular, the sorption data for Se(ÀII) species in alkaline groundwater are scarce.…”

Section: Introductionmentioning

confidence: 99%

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Sorption Behavior of Selenium(−II) on Rocks under Reducing Conditions

Iida

Tanaka

Yamaguchi

et al. 2011

J. Nucl. Sci. Technol.

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The sorption of radionuclides on rocks is an important factor for performance assessment of geologic disposal of radioactive wastes. Batch sorption experiments under reducing conditions were carried out to investigate the sorption behavior of selenium onto granodiorite, sandy mudstone, tuffaceous sandstone, and their major constituent minerals and accessory minerals. Rock cores and groundwater employed in the experiments were sampled with special care to avoid exposing the cores and groundwater to air to minimize their oxidation. Selenium was spiked as HSe À and Se 4 2À in the experimental solutions, and reducing conditions were maintained throughout the sorption periods. Distribution coefficients, K d (m 3 kg À1 ), were obtained in the ranges of 2:2 Â 10 À4 to 4:0 Â 10 À3 m 3 kg À1 for granodiorite, 3:3 Â 10 À2 to 5:6 Â 10 À2 m 3 kg À1 for sandy mudstone, and 2:9 Â 10 À2 to 8:2 Â 10 À2 m 3 kg À1 for tuffaceous sandstone at pHs 8.5 to 11.5. The dominant sorbent minerals for selenium over a neutral to alkaline pH range were determined to be biotite for the granodiorite samples and pyrite for the sandy mudstone and tuffaceous sandstone samples.

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