engleski

Minerals from Macedonia. X. Separation and identification of some oxide minerals by FT IR spectroscopy, AAS, AES-ICP and powder XRD

The fourier transform infrared spectroscopy (FT IR), powder X-ray diffraction (XRD) as well as atomic absorption spectrometry (AAS) and emission atomic spectrometry with induced coupled pl as ma (AES-ICP) are used as powerful techniques in the proces s of identification of several oxide minerals (hematite, Fe203 ; magnetite, Fe304 ; limonite, FeOOH ; goethite, a-FeOOH ; corundum, A1203 ; ruti le, Ti02 ; chromite, FeCr204) collected from various localities in the Republic of Macedonia. The mineral association of the localities where the minerals appear from (Pehčevo, Damjan, Alšar, Ržanovo, Sivec, Raduša, Veselčani, Košino) with their petrological and mineralogical aspects are discussed. The content of the main and trace elements in the studied oxides is determined using AAS, AES-ICP, classical chemical analysis and the resuIts are related to the geological and mineralogical conditions of their origin localities. As a pattern for mineral identification was the comparison of the ir infrared bands (their number, frequencies and intensities) with the corresponding literature data for the analogue (naturai and synthetic) mineral species. In this context, in some cases disagreements between the infrared spectra of the studied mineral types (the number of bands and their frequencies) and the corresponding literature analogues appeared and have been discussed. The caused additional difficulties in the identification of the studied minerals were solved by the analysis of their X-ray patterns. Powder X-ray patterns were also representative for the detection of impurities in some of the studied mineral samples.

Oxide minerals ; Macedonia ; FT IR spectroscopy ; AES-ICP ; AAS ; powder XRD

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