Premium
Interlayer materials of partially interlayered vermiculites in Dystrochrepts derived from Tertiary sediments
Author(s) -
MATSUE N.,
WADA K.
Publication year - 1988
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1988.tb01202.x
Subject(s) - dissolution , oxalate , aluminosilicate , soil water , chemistry , inorganic chemistry , mineralogy , materials science , nuclear chemistry , geology , organic chemistry , soil science , catalysis
SUMMARY Interlayer materials of partially interlayered vermiculites (PIV) in 15 Dystrochrepts derived from Tertiary sediments were analysed by dissolution with hot 1/3M sodium citrate or 0.15 M oxalate‐oxalic acid in combination with XRD and IR spectroscopy. Both the citrate and oxalate treatments dissolved Al from all soil clays. The dissolution of Al by the citrate treatment paralleled the dissolution of Si and the interlayer collapse of PIV, whereas that by the oxalate treatment did not, indicating that the interlayer materials contain not only Al but Si. The materials dissolved by the citrate treatment had a molar Si/Al ratio ranging from 0.72 to 0.24 that decreased with the increasing interlayering of PIV. Differential IR spectroscopy indicated the dissolution of aluminosilicates possibly having Si‐O, Al‐OH and Si‐O‐Al bonds, but not Si‐O‐Si bonds. The extent of interlayering of PIV showed a good correlation with the amount of Al dissolved by the citrate treatment and increased with increasing soil pH (H 2 O) from 4.5 to 5.2 and with decreasing exchangeable Al in soil. Formation of a hydroxy‐Al sheet partially bonded with Si‐tetrahedra was suggested as a possible model of the interlayer structure of PIV. The differences between PIV in the studied Inceptisols and other soils are discussed.