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This article in SSSAJ

  1. Vol. 55 No. 3, p. 745-750
     
    Received: June 25, 1990
    Published: May, 1991


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doi:10.2136/sssaj1991.03615995005500030018x

Determination of the Aromaticity of Humic Substances by X-Ray Diffraction Analysis

  1. M. Schnitzer ,
  2. H. Kodama and
  3. J. A. Ripmeester
  1. Land Resource Centre, Research Branch, Agriculture Canada, Ottawa, Ontario, K1A 0C6
    Chemistry Division, National Research Council, Ottawa, Ontario, K1A 0R9, Canada

Abstract

Abstract

Aromaticity is an important indicator of the origin, stability, and chemical reactivity of soil humic materials. The only method available at the present time for measuring the aromaticity of these materials is 13C nuclear magnetic resonance (NMR), so that there exists a need for an alternate, independent method. With this in mind, we developed a method based on the x-ray diffraction (XRD) analysis of humic materials. Total areas in XRD patterns are subdivided into areas due to G (aromatic) and γ (aliphatic) bands. The G-band area, expressed as a percent of the total area, is assumed to be a measure of the aromaticity. The method was tested on 14 natural humic acids, one natural fulvic acid, and one synthetic humic acid. Aromaticities so measured were then compared with aromaticities computed from 13C-NMR spectra. The agreement between the two methods was acceptable. This establishes the XRD method as a valid alternative to the 13C-NMR method.

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