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Experimental Validation of the Monophase Structure Model for Montmorillonite Solubility
Author(s) -
Kittrick J. A.,
Peryea F. J.
Publication year - 1988
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1988.03615995005200040059x
Subject(s) - montmorillonite , solubility , saturation (graph theory) , thermodynamics , chemistry , ion exchange , phase (matter) , ion , mineralogy , mathematics , physics , organic chemistry , combinatorics
Previously published solubility data for Belle Fourche montmorillonite were plotted on pH or pH‐pK + vs. pSi(OH) 4 axes, in order to determine the proper model for representing smectite formulas in hydrolysis reactions. The resulting line slopes did not agree with predictions based upon a model where smectite and exchangeable ions are considered to be separate phases. A model where exchanger and exchangeable ions form a single macroscopic phase (monophase) generated a line slope that agreed with the data within experimental error. Agreement between the monophase model and the data suggests that the experimental requirements for phase meta‐equilibrium and K saturation were sufficiently met to show that smectite solid solutions behave as thermodynamic phases over the time span of the experiments.