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Changes in physico-chemical properties of some clay minerals by reducing extraction reagents
Citation Link: https://doi.org/10.15480/882.418
Publikationstyp
Journal Article
Date Issued
1988-01
Sprache
English
Author(s)
TORE-DOI
Journal
Volume
3
Issue
1
Start Page
75
End Page
84
Citation
Applied clay science 3 (1988), 75-84
Publisher DOI
An extraction sequence in three steps with buffered hydroxylamine hydrochloride, oxalate and dithionite solutions was used for removal of Fe-oxide coatings from standard clay minerals: kaolinite, illite and mixed layer smectite/illite. After each extraction step the cation exchange capacity, specific surface area and the concentrations of Al, Si, Fe, Mg, K and Ca in solution were measured.
For all minerals the specific surface area increases after treatment with hydroxylamine hydrochloride and oxalate, but is decreases after treatment with dithionite solution. The cation exchange capacity shows no significant change for smectite/illite, a small decrease for illite and a continuous increase for kaolinite after treatment with the extractants.
K, Ca, and Mg are mainly extractable by hydroxylamine hydrochloride. After each extraction step an additional exchange of these cations could be observed by treatment with ammonium acetate.
For all minerals the specific surface area increases after treatment with hydroxylamine hydrochloride and oxalate, but is decreases after treatment with dithionite solution. The cation exchange capacity shows no significant change for smectite/illite, a small decrease for illite and a continuous increase for kaolinite after treatment with the extractants.
K, Ca, and Mg are mainly extractable by hydroxylamine hydrochloride. After each extraction step an additional exchange of these cations could be observed by treatment with ammonium acetate.
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