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Variation in Exchangeable K and Relation to Intergrade Layer Silicate Minerals
Author(s) -
Carter D. L.,
Harward M. E.,
Young J. L.
Publication year - 1963
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/sssaj1963.03615995002700030021x
Subject(s) - vermiculite , mica , chemistry , silicate , silicate minerals , clay minerals , chlorite , mineralogy , mineral , fluorite , nuclear chemistry , geology , quartz , materials science , metallurgy , paleontology , organic chemistry
A mica‐vermiculite material was treated with MgCl 2 and converted to a typical Mg‐vermiculite. The same material was treated with AlCl 3 and converted to a 14Å. mineral concluded to be a vermiculite‐chlorite intergrade similar to those recently reported in the literature. AlCl 3 treatment of Mg‐vermiculite also resulted in intergrade formation. In B22 and C horizon samples of a Dayton soil, added aluminum blocked K fixation and increased K release when samples were cycled through various wetting and drying treatments. The roles of aluminum in release of K and in intergrade mineral formation were shown to be interrelated. It was concluded that Al 3+ replaces K + in mica and Mg 2+ in vermiculite lattices and then probably forms a sixfold coordination compound with H 2 O or (OH) ‐ which blocks lattice collapse upon subsequent K‐saturation. The increase in exchangeable K upon drying of soils appears to be related to the replacement of fixed K + by Al 3+ arising from degradation of minerals.