Water in Albitic Glasses

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Abstract
Infrared spectroscopy has been calibrated to provide a precise and accurate method for determining the concentrations of molecular water and hydroxyl groups in hydrous albitic glasses. At total water contents less than 4 wt.%, most of the water is dissolved as hydroxyl groups; at higher total water contents, molecular water becomes the dominant species. For total water contents above 4 wt.%, the amount of water dissolved as hydroxyl groups is nearly constant at about 2 wt.% and additional water is incorporated as molecular water. These trends in the concentrations of the H-bearing species are similar to those observed in other silicate glasses using infrared and NMR spectroscopies. The ratio of molecular water to hydroxyl groups at a given total water content is independent of the pressure and only weakly dependent on the temperature of equilibration.

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