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The Speciation of Carbon Dioxide in Sodium Aluminosilicate Glasses by Gerald Fine; Edward Stolper is a Earth and Planetary Sciences article available to read on EtoBox.

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Infrared spectroscopy has been used to study the speciation of CO 2 in glasses near the NaA102-SiO 2 join quenched from melts held at high temperatures and pressures. Absorption bands resulting from the antisymmetric stretches of both molecular COg (2,352 cm-1) and CO32 (1,610 cm-\* and 1;375 cm ~) are observed in these glasses. The latter are attributed to distorted Na-carbonate ioniccomplexes. Molar absorptivities of 945 liters/mole-cm for the molecular CO 2 band, 2001iters/mole-cm for the 1,610 cm ~ band, and 235 liters/mole-cm for the 1,375 cmz band have been determined. These molar absorptivities allow the quantitative determination of species concentrations in the glasses with a precision on the order of several percent of the amount present. The accuracy of the method is estimated to be +\_ 15 20% at present. The ratio of molecular CO2 to CO32-in sodium aluminosilicate glasses varies little for each silicate composition over the range of total dissolved CO 2 content (0-2%), pressure (15-33 kbar) and temperature (1,400-1,560 ~ C) that we have studied. This ratio is, however, a strong function of silicate composition, increasing both with decreasing Na20 content along the NaA1

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Author

Gerald Fine; Edward Stolper

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0010-7999)

Published

1985

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)