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This article in SSSAJ

  1. Vol. 56 No. 6, p. 1811-1817
     
    Received: Oct 11, 1991


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doi:10.2136/sssaj1992.03615995005600060027x

The Analysis of Soil Organic Matter by Pyrolysis-Field Ionization Mass Spectrometry

  1. M. Schnitzer  and
  2. H. R. Schulten
  1. Centre for Land and Biological Resources Research, Research Branch, Agriculture Canada, Ottawa, ON K1A OC6, Canada
    Fachhochschule Fresenius, Dep. of Trace Analysis, Dambachtal 20, 6200 Wiesbaden, Germany

Abstract

Abstract

At the present time, the analysis of organic matter (OM) in soils requires extraction of the OM, fractionation of the extract into humic acid (HA), fulvic acid (FA), and humin, and purification of each fraction prior to more detailed characterization by chemical, spectroscopic, and other methods. To obviate the need for these laborious and possibly damaging procedures, we examined the possibility of applying pyrolysis-field ionization mass spectrometry (Py-FIMS), a method that provides information at the molecular level on complex organic materials, to whole soils and HAs, FAs, and humins separated from these soils. In all materials, carbohydrates, phenols, lignin monomers and dimers, and, to a lesser extent, n-fatty acids were the major components. Our data indicate that whole soils are the most suitable materials for the analysis of OM in soils. Thus, Py-FIMS has an advantage compared with existing methods in that it permits soil chemists and other interested scientists to do comprehensive OM analyses on air-dry soils, even ones with low OM contents, without any pretreatment.

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