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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
The effect of experimental conditions and particle size on DTA curves of clay minerals
 Vítámvásová, E. ; Plevová, Eva ; Vaculíková, Lenka
DTA curves of clay minerals can be affected by measurement conditions and the particle size of studied minerals. The DTA curves of kaolinite Sedlec and montmorillonite Jelšový potok were measured and then the effect of heating rate, particle size and compaction influence on the character of the DTA curves was evaluated. Heating rate has the greatest influence on the character of DTA curves.
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Determination of minerals in slates by infrared spectroscopy and chemometrical methods
 Ritz, M. ; Vaculíková, Lenka ; Plevová, Eva
Application of infrared spectroscopy with chemometry methods to determination of chlorite, muscovite, albite and quartz in slates was suggested. Eighty six samples of slates from different localities in Czech Republic were used in this study. X-ray diffraction with Rietveld method was used as primary reference method. Infrared spectra were collected by the bromide pellets technique and by the diffuse reflectance technique. The infrared spectra and the results of X-ray diffraction were used for creation of the chemometry models by Partial Least Squares regression. The equality of results of chemometric models and results of X-ray analysis were tested. The statistical tests certified the statistical equality of results.
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