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The Application of Drift Spectroscopy to the Multicomponent Analysis of Organic Chemicals Adsorbed on Montmorillonite

Published online by Cambridge University Press:  28 February 2024

Robert W. Parker  and
Raymond L. Frost
Robert W. Parker
Affiliation:
Queensland Department of Lands, Robert Wicks Research Station, PO Box 178, Inglewood, Q, 4387, Australia
Raymond L. Frost
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, PO Box 2434, Brisbane, Q, 4001, Australia
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Abstract

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Diffuse Reflectance Fourier Transform Infrared spectroscopy was used to monitor both molecular interactions and concentrations of volatile organic chemicals adsorbed on a commercial montmorillonite. Chemicals tested included propanoic acid, hexanal, heptanal, trimethylamine, dimethylsulfide and dimethyldisulfide. Diffuse Reflectance Fourier Transform Infrared spectroscopy had several advantages over other infrared techniques including ease of sample preparation, greater numbers of useful bands and the ability to detect both major and minor components from the same spectra. Evidence for the formation of organo-clay complexes was found for all chemicals except dimethylsulfide. Spectra of mixed chemicals on the clay showed numerous overlapping bands. Organic concentrations were determined by multicomponent analysis using a least squares curve fitting technique. Significant correlation (P < 0.01) between actual and determined concentrations of added organics was obtained for all except dimethylsulfide. Here the weak spectral contribution appeared to be overshadowed by the strongly adsorbing montmorillonite with consequent decrease in sensitivity. Diffuse Reflectance Fourier Transform Infrared spectroscopy of organo-montmorillonite complexes could be used both as a means of studying molecular interactions and for the determination of adsorbed organic concentrations.

Keywords

MontmorilloniteOdorOrganicSlow-releaseSorption
Type
Research Article
Information
Clays and Clay Minerals , Volume 44 , Issue 1 , February 1996 , pp. 32 - 40
Copyright
Copyright © 1996, The Clay Minerals Society

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