Diffuse reflectance spectra of smectite minerals in the near infrared and their relationship to chemical composition

E. Ben-Dor, A. Banin

Research output: Contribution to journalArticlepeer-review

Abstract

High resolution reflectance spectra of 12 selected smectite minerals were determined in the near infrared (NIR) region,. The total concentration of four constituents (Al, Mg, Fe and Si) in the minerals was determined by XRF. Two approaches were studied in order to get the best correlation between chemical and spectroscopical data: (I) Selection of bands according to known OH-cation absorption features and calculation of the correlation between corrected absorption values and the constituent concentration. Some trends, but generally poor correlations (r2 = 0.36-0.85) were obtained between chemical and spectroscopic data. (II) Selection of wavelengths from all the spectral regions in which high linear correlation exists between a given constituent concentration and the absorption intensity. Near infrared analysis (NIRA) based upon approach II may have promising applications as a non-destructive and rapid method for analysis of constituent concentration in clays. -from Authors

Original languageEnglish
Pages (from-to)117-128
Number of pages12
JournalSciences Geologiques - Bulletin
Volume43
Issue number2-4
StatePublished - 1990

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