Abstract
The element selenium has become a considerable environmental concern due its accumulation in aquifers on the one hand and the high radiotoxicity of its long-lived isotope 79Se on the other hand. Se(VI) is the most mobile of the various Se cations. This study deals with the interaction of Se(VI) with rock-forming minerals (carbonates) to better understand how to mitigate the potential environmental hazards of Se. The effect of Se(VI) on the cystallization of CaCO3 at room temperature was studied using the silica hydrogel method. The CaCO3 crystals obtained were characterized by X‑ray powder diffraction, scanning electron microscopy and electron microprobe. The presence of Se(VI) in the growth medium has a clear effect on the polymorph selection of CaCO3, promoting the formation of vaterite and inhibiting that of aragonite. Se(VI) also affects the characteristics of calcite crystals, which show progressively more elongated habits and smaller sizes with increasing Se(VI) concentration in the growth medium. The effect of Se(VI) on both the polymorphic crystallization of CaCO3 and the characteristics of calcite crystals shows features strikingly similar to those of other tetrahedral anionic groups like S(VI) and Cr(VI). This similarity extends to the amount of Se incorporated into the structure of the different CaCO3 polymorphs, with calcite having Se contents up to 1200 ppm, vaterite up to 500 ppm, and aragonite growing virtually Se-free. The role of Se(VI) on the crystallization of CaCO3 is discussed taking into consideration the physicochemical conditions in the growth medium at nucleation, which were modeled using the PHREEQ code for low-temperature aqueous geochemistry. The possible effect of the incorporation of the Se(VI) on the relative stability and, by extension, on the solubility of CaCO3 polymorphs is also discussed.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Review article. The crystal structure and vibrational spectroscopy of jarosite and alunite minerals
- Versatile monazite: Resolving geological records and solving challenges in materials science. Petrogenesis of the Kulyk Lake monazite-apatite-Fe(Ti)-oxide occurrence revealed using in-situ LA-(MC)-ICP-MS trace element mapping, U-Pb dating, and Sm-Nd isotope systematics on monazite
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- Petrology and geochemistry of lunar granite 12032,366-19 and implications for lunar granite petrogenesis
- Extreme fractionation from zircon to hafnon in the Koktokay No. 1 granitic pegmatite, Altai, northwestern China
- Controls of P-T path and element mobility on the formation of corundum pseudomorphs in Paleoproterozoic high-pressure anorthosite from Sittampundi, Tamil Nadu, India
- Aluminum speeds up the hydrothermal alteration of olivine
- Iron pairs in beryl: New insights from electron paramagnetic resonance, synchrotron X-ray absorption spectroscopy, and ab initio calculations
- Effects of fluid and melt density and structure on high-pressure and high-temperature experimental studies of hydrogen isotope partitioning between coexisting melt and aqueous fluid
- DFT simulation of the occurrences and correlation of gold and arsenic in pyrite
- Crystal structure and hydration/dehydration behavior of Na2Mg(SO4)2·16H2O: A new hydrate phase observed under Mars-relevant conditions
- The diffusion behavior of hydrogen in plagioclase feldspar at 800–1000 °C: Implications for re-equilibration of hydroxyl in volcanic phenocrysts
- Quantification of dissolved CO2 in silicate glasses using micro-Raman spectroscopy
- Spin transition of Fe2+ in ringwoodite (Mg,Fe)SiO4 at high pressures
- P-V-T relations of γ-Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus
- Bonding and electronic changes in rhodochrosite at high pressure
- Growth of calcium carbonate in the presence of Se(VI) in silica hydrogel
- Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements
- Far-infrared spectra of synthetic dioctahedral muscovite and muscovite–tobelite series micas: Characterization and assignment of the interlayer I–Oinner and I–Oouter stretching bands
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- Mcalpineite from the Gambatesa mine, Italy, and redefinition of the species
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- Erratum