Spontaneous Oxygen Isotope Exchange between Carbon Dioxide and Oxygen-Containing Minerals: Do the Minerals "breathe" CO2?

0466998 - ÚFCH JH 2017 RIV US eng J - Journal Article
Civiš, Svatopluk - Bouša, Milan - Zukal, Arnošt - Knížek, Antonín - Kubelík, Petr - Rojík, P. - Nováková, Jana - Ferus, Martin
Spontaneous Oxygen Isotope Exchange between Carbon Dioxide and Oxygen-Containing Minerals: Do the Minerals "breathe" CO2?
Journal of Physical Chemistry C. Roč. 120, č. 1 (2016), s. 508-516. ISSN 1932-7447. E-ISSN 1932-7455
R&D Projects: GA MŠMT LD14115; GA MŠMT(CZ) LD13060; GA ČR(CZ) GA14-12010S
Grant - others:COST(XE) CM1104
Institutional support: RVO:61388955
Keywords : Absorption spectroscopy * Infrared spectrometers * Oxygen
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 4.536, year: 2016

The spontaneous isotopic exchange of oxygen atoms between dry powdered Ti16O2-containing minerals and gaseous C18O2 was studied using gas-phase high-resolution Fourier transform infrared absorption spectroscopy (FTIR) of carbon dioxide isotopologues. The absorption rovibrational spectra of all measured carbon dioxide isotopologues were assigned and then used for quantification of the time-dependent isotope exchange of oxygen atoms (16O) from the surface crystalline lattice of the solid mineral samples with (18O) oxygen atoms from gaseous C18O2. Similar to our previous studies devoted to the isotopic exchange activity of titanium dioxide, we determined that rutile, montmorillonite, siderite, calcite, and basaltic minerals also exhibit unexpectedly significant oxygen mobilities between solid and gas phases. The rate of formation of gaseous C16O2 is found to be highly dependent on the nature of the mineral sample. Our previous studies together with the results presented here suggest that such crystal-surface oxygen isotope mobilities can be explained by two mechanisms: the cluster-like structure of finely powdered materials or the existence of oxygen-deficiency sites in the structure of the surface crystal lattice. © 2015 American Chemical Society.
Permanent Link: http://hdl.handle.net/11104/0265162