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 language | English |
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Pages (from-to) | 95-102 |
Number of pages | 8 |
Journal | Chemical Geology |
Volume | 32 |
Issue number | 1-4 |
DOIs | |
State | Published - 1981 |