Uptake of Se(IV/VI) oxyanions by hardened cement paste and cement minerals: An X-ray absorption spectroscopy study

Bonhoure, Isabelle; Baur, Isabel; Wieland, Erich; Johnson, C. Annette; Scheidegger, André M.

doi:10.1016/j.cemconres.2005.05.003

Cited by 57 publications

(41 citation statements)

References 26 publications

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“…For this reason, the total cumulative dose of radioactivity could be affected by an eventual release of this radionuclide from waste repositories to the biosphere (ANDRA 2005). This has motivated the study of materials with high selenite retention capacities (the thermodynamically most stable chemical species in these environments), and the study of selenite interaction with clays (Breynaert et al 2008;Bruggeman et al 2007Bruggeman et al , 2005Peak et al 2006), cements (Bonhoure et al 2006;Johnson et al 2000b;Mace et al 2007;Pointeau et al 2006) or clays in the presence of Fe(II) (Charlet et al 2007). 75 Se is another isotope relevant in environmental studies.…”

Section: Isotopes and Radioactivitymentioning

confidence: 99%

Selenium environmental cycling and bioavailability: a structural chemist point of view

Fernández-Martı́nez

Charlet

2009

Rev Environ Sci Biotechnol

390

235

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International audienceSelenium is usually known as the ‘double-edged sword element' for its dual toxic and beneficial character to health. Since the pioneer works by Schwarz and Foltz on the relationships between selenium deficiency and liver, muscle and heart diseases, many efforts have been undertaken to better understand the role of selenium in health. At the same time, an increasing number of publications have appeared during these last years on the selenium physico–chemical interactions within the environment. Both types of research represent ongoing efforts to correctly estimate the bioavailability of selenium species for health and the environment. Redox reactions, diffusion, adsorption and precipitation processes or interactions with organic matter and biota govern the speciation and mobility of selenium in the environment. This review intends to emphasize and collect the important advances made during these last years in the mechanistic understanding of processes which govern selenium cycling and bioavailability, like adsorption at the mineral/water interface, precipitation of elemental selenium, or bioavailability of nanoscaled precipitates. The advent of powerful spectroscopic techniques, like X-ray absorption spectroscopy, has allowed the structural description of adsorption and substitution processes that selenium undergoes in a variety of minerals. These and other structural details about selenium precipitates are reviewed here, together with their relationships to the bioavailability of the element in the environment

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Section: Isotopes and Radioactivitymentioning

confidence: 99%

Selenium environmental cycling and bioavailability: a structural chemist point of view

Fernández-Martı́nez

Charlet

2009

Rev Environ Sci Biotechnol

390

235

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“…The application of XAS to complex matrices in relation to environmental fate and behavior of contaminants is still relatively rare, but it has been employed in a limited number of studies of the speciation of metals in cement pastes, including chromium [9], cobalt [10], copper [11], lead [12], neodymium [13], selenium [14], tin [15], uranium [16] and zinc [17], as well as nickel [18][19][20]. Apart from Rinehart et al [9], who examined the oxidation state of chromium in a s/s contaminated soil and showed that this was not affected by S/S, and Hsaio et al [11], who indicated that S/S respeciated CuCl2 and reduced forms of copper in municipal waste incinerator air pollution control residues to Cu(OH)2, other studies have all prepared hydrated cement pastes by mixing pure solutions of soluble metal salts with cement powder.…”

Section: Introductionmentioning

confidence: 99%

Nickel speciation in cement-stabilized/solidified metal treatment filtercakes

Roy

Stegemann

2017

Journal of Hazardous Materials

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Cement-based stabilization/solidification (S/S) is used to decrease environmental leaching of contaminants from industrial wastes. In this study, two industrial metal treatment filtercakes were characterized by X-ray diffractometry (XRD), thermogravimetric and differential thermogravimetric analysis (TG/DTG) and Fourier transform infrared (FTIR); speciation of nickel was examined by X-ray absorption (XAS) spectroscopy. Although the degree of carbonation and crystallinity of the two untreated filtercakes differed, -nickel hydroxide was identified as the primary nickel-containing phase by XRD and nickel K edge XAS. XAS showed that the speciation of nickel in the filtercake was unaltered by treatment with any of five different S/S binder systems. Nickel leaching from the untreated filtercakes and all their stabilized/solidified products, as a function of pH in the acid neutralization capacity test, was essentially complete below pH ~5, but was 3-4 orders of magnitude lower at pH 8-12. S/S does not respeciate nickel from metal treatment filtercakes and any reduction of nickel leaching by S/S is attributable to pH control and physical mechanisms only. pH-dependent leaching of Cr, Cu and Ni is similar for the wastes and s/s products, except that availability of Cr, Cu and Zn at decreased pH is reduced in matrices containing ground granulated blast furnace slag.2

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“…Bonhoure et al [73] have shown that Se redox reactions do not influence uptake processes in cementitious systems. EXAFS spectra of Se(IV) and Se(VI) bound to CH, AFt, AFm and CSH were similar to those of SeO 4 2--and SeO 3 2-in solution,…”

Section: Seleniummentioning

confidence: 99%

Binding mechanisms of radionuclides to cement

Evans

2008

Cement and Concrete Research

137

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Radionuclide solubility is one of the factors that can determine the 'source term' for potential migration to the far field. Hence, the mechanisms of immobilisation of radionuclides in cements need close study in order to quantify the nature of the binding. The nature of the binding forces in a cement matrix is very species sensitive, so it is difficult to produce a general description. This review summarises the main sorption mechanisms and then details immobilisation mechanisms for many elements.

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Uptake of Se(IV/VI) oxyanions by hardened cement paste and cement minerals: An X-ray absorption spectroscopy study

Cited by 57 publications

References 26 publications

Selenium environmental cycling and bioavailability: a structural chemist point of view

Selenium environmental cycling and bioavailability: a structural chemist point of view

Nickel speciation in cement-stabilized/solidified metal treatment filtercakes

Binding mechanisms of radionuclides to cement

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