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Illite Solubility
Author(s) -
Routson R. C.,
Kittrick J. A.
Publication year - 1971
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/sssaj1971.03615995003500050025x
Subject(s) - illite , solubility , goose , chemistry , aqueous solution , solubility equilibrium , analytical chemistry (journal) , mineralogy , nuclear chemistry , geology , chromatography , clay minerals , paleontology
Equilibrium solubilities of the 0.2–2.0µ size fraction of three K + ‐saturated illites were determined in high‐pH aqueous solutions. Beavers Bend, Fithian, and Goose Lake illites were selected for the study. Solubility products were found to be 10 ‐77.6±0.1 for Beavers Bend, 10 ‐76.6±0.3 for Fithian, and 10 ‐76.7±0.2 for Goose Lake illites, based on mean calculated formulae of K 0.53 (Al 1.66 , Fe 0.20 , Mg 0.13 ) (Si 3.62 , Al 0.39 ) O 10 (OH) 2 , K 0.64 (Al 1.54 , Fe 0.29 , Mg 0.19 ) (Si 3.51 , Al 0.49 ) O 10 (OH) 2 , and K 0.59 (Al 1.58 , Fe 0.24 , Mg 0.15 ) (Si 3.65 , Al 0.35 ) O 10 (OH) 2 , respectively. From the solubility product and known thermodynamic relationships, the standard free energy of formation (Δ G ) was calculated for each illite. Δ G 's were −1267.6±0.9 for Beavers Bend, −1270.6±1.0 for Fithian, and −1265.3±1.0 kcal/gram formula weight for Goose Lake illities.