Selenite reduction in Boom clay: Effect of FeS2, clay minerals and dissolved organic matter

Bruggeman, Christophe; Maes, André; Vancluysen, Jacqueline; Vandemussele, P

doi:10.1016/j.envpol.2005.02.010

Cited by 87 publications

(82 citation statements)

References 13 publications

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“…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]. In this study, the great decrease of selenium concentration by a small amount of addition of freshly synthesized magnetite even in the silicate solution, unlike commercial magnetite, suggests the change of selenite oxidation state.…”

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

confidence: 39%

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 Ircontrasting

confidence: 39%

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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“…Upon introduction of SeO 3 2) to Boom clay suspensions (equilibration up to 9 months), the competing adsorption process onto clays minerals (illite), and the presence of humic substances, decreased the kinetics of reduction with respect to FeS 2 samples. Bruggeman et al (2005) demonstrated that selenite reduction by FeS 2 is kinetically controlled, with clay minerals and organic matter playing an important role.…”

Section: Transport and Redox Reactionsmentioning

confidence: 99%

“…Mackinawite is the first crystalline iron sulfide phase that is formed in aqueous systems (Wolthers et al 2005) and is a precursor in sedimentary pyrite (FeS 2 ) formation (Wang & Morse 1996). Recent studies have demonstrated that mackinawite is an important natural reductant in soils and sediments for organic and inorganic contaminants (Moyes et al 2000;Moyes et al 2002;Lee & Batchelor 2003;Arias and Tabo 2003;Livens et al 2004;Bruggeman et al 2005).…”

Section: Transport and Redox Reactionsmentioning

confidence: 99%

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Hullebusch

Lens

Tabak

2005

Rev Environ Sci Biotechnol

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The biotransformation of metals is an exciting, developing strategy to treat metal contamination, especially in environments that are not accessible to other remediation technologies. However, our ability to benefit from these strategies hinges on our ability to monitor these transformations in the environment. That's why remediation of contaminated sediments and soil requires detailed in situ characterization of the speciation of the toxic substances and their transformations with respect to time and spatial distribution. The present paper gives an overview of the literature regarding research performed in the laboratory as well as in the field.

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“…In modern marine sediments the most frequent pyrite morphology is framboidal, 50 and we demonstrate Se in this morphology to exist as ferroselite, which is thermodynamically stable over a wide range of pH and low oxygen conditions ( Figure S12 left in the SI). 51,52 The formation of ferroselite has been studied experimentally under both abiotic and biotic conditions. Naveau et al 18 investigated the adsorption of aqueous Se(IV) and Se(-II) onto natural and synthetic pyrites and showed that Se is first reduced in solution and then it adsorbs onto the pyrite surface.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Selenium Speciation in Framboidal and Euhedral Pyrites in Shales

Matamoros-Veloza

Peacock

Benning

2014

Environ. Sci. Technol.

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The release of Se from shales is poorly understood because its occurrence, distribution, and speciation in the various components of shale are unknown. To address this gap we combined bulk characterization, sequential extractions, and spatially resolved μ-focus spectroscopic analyses and investigated the occurrence and distribution of Se and other associated elements (Fe, As, Cr, Ni, and Zn) and determined the Se speciation at the μ-scale in typical, low bulk Se containing shales. Our results revealed Se primarily correlated with the pyrite fraction with exact Se speciation highly dependent on pyrite morphology. In euhedral pyrites, we found Se(-II) substitutes for S in the mineral structure.However, we also demonstrate that Se is associated with framboidal pyrite grains as a discrete, independent FeSe x phase. The presence of this FeSe x species has major implications for Se release, because FeSe x species oxidize much faster than Se substituted in the euhedral pyrite lattice. Thus, such an FeSe x species will enhance and control the dynamics of Se weathering and release into the aqueous environment.

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Selenite reduction in Boom clay: Effect of FeS2, clay minerals and dissolved organic matter

Cited by 87 publications

References 13 publications

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

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

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Selenium Speciation in Framboidal and Euhedral Pyrites in Shales

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