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Negative Adsorption by Vermiculite: Salt Exclusion from Interlayer Volumes
Author(s) -
ElSwaify Samir,
Coleman N. T.,
Bredell G.,
Arca M.
Publication year - 1967
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/sssaj1967.03615995003100040015x
Subject(s) - vermiculite , electrolyte , adsorption , aqueous solution , salt (chemistry) , volume (thermodynamics) , chemistry , ionic bonding , mineralogy , inorganic chemistry , chemical engineering , ion , materials science , thermodynamics , organic chemistry , composite material , physics , electrode , engineering
For vermiculite immersed in NaCl or CaCl 2 solutions, the amount of water that excluded Cl was 0.22 g/g and was not affected appreciably by the electrolyte concentration or the particle size of the mineral. The measured exclusion volume corresponds to the interlayer volume calculated from the c‐axis spacing and an assumed specific surface of 750 m 2 /g. The results suggest that vermiculite in aqueous solutions should be regarded as having two distinct and clearly separated ionic regions—the interlayer spaces containing exchangeable cations and water but not soluble electrolyte, and the interparticle solution.