Nontronite after acid or alkali attack

L. Heller-Kallai*, I. Rozenson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

X-ray diffraction patterns, infra-red and Mössbauer spectra of samples of nontronite reacted with 0.1 N HCl at 70-90°C for various lengths of time were indistinguishable from those of the starting material. After appropriate corrections for exchange of interlayer cations, constant Al/Mg and Al/Fe ratios of the solid were maintained. It was concluded that dissolution may be incongruent in a narrow reaction rim, but that the structure of the bulk material is not affected by acid attack. In contrast, minor changes were observed in the infra-red and Mössbauer spectra of samples reacted with 0.3 N NaOH solution. These were attributed to partial deprotonation of the entire structure. Scanning electron micrographs showed that alkali attack changed the morphology of the clay appreciably while acid attack did not.

Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalChemical Geology
Volume32
Issue number1-4
DOIs
StatePublished - 1981

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