Abstract
Most of the previously determined water solubilities in silicate melts are overestimated because of an experimental quenching problem. Hydration of run product glass with coexisting aqueous bubbles causes the overestimation. Due to relatively slow quenching rate in conventional IHPVs, hydration of the glass by trapped aqueous bubbles inevitably takes place at a significant speed. In this paper, a new method for the solubility determination is proposed by which the hydration problem can be avoided. Using a new IHPV with rapid quenching device and utilizing intensive mapping analysis of water for the experimental charges with SIMS, solubility of water was newly determined for albite melt at 2, 000bar. The solubility obtained was 10-30% lower than those previously reported. Because the water solubility data for albite melt have been used as standard reference in silicate melt literatures, the present observation has pivotal importance.
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