Study of natural glasses through their behavior as membrane electrodes, Part 2

The exchange constants and regular solution constants for a number of exchange reactions involving analyzed natural and simulated natural glasses have been determined. The experimental method used provides quick and simple determination of these constants. The calculation of the internal energy differences of model ion exchange systems involving alkali and alkaline earth cations yields sequences (but not magnitudes) of selectivity that agree with the experimental results. Complex glasses such as obsidians, tektites and basaltic glasses do not in general show simple correlations between composition and ion exchange behavior.