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This article in SSSAJ

  1. Vol. 41 No. 6, p. 1114-1118
     
    Received: June 3, 1977
    Published: Nov, 1977


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doi:10.2136/sssaj1977.03615995004100060020x

Pyrolysis-Gas Chromatography-Mass Spectrometry of Soil Humic Fractions: I. The Low Boiling Point Compounds1

  1. F. Martin,
  2. C. Saiz-Jimenez and
  3. A. Cert2

Abstract

Abstract

Pyrolysis-gas chromatography-mass spectrometry studies of fulvic and humic acids from different soils: Calcic Rhodoxeralf, Typic Xerochrept, Typic Chromoxeret, Andic Hapludult, Humic Haplorthod, Typic Haplorthod and a Canadian Orthic Humo-Ferric Podzol were made. Samples were pyrolyzed at 700°C for 10 sec, and low boiling point compounds were separated in a Chromosorb 102 column. Peaks were identified with a mass spectrometer coupled to the gas chromatograph. Major components from soil humic acids were related to proteins, namely methane, ethene, ethane, propene, propane, butene, acetonitrile, benzene, pyridine, pyrrol, toluene, and phenol, and to polysaccharides, such as acetaldehyde, acetone, furan, methylfuran, 2-butanone, and furfural. Soil fulvic acids gave pyrograms with major peaks of methane, ethene, acetaldehyde, acetone, furan, acetic acid, 2-butanone, benzene, toluene, and furfural, which are characteristic for soil polysaccharides. Bromomethane, an unusual compound, was found in the humic fractions from podzolic soils.

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