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This article in SSSAJ

  1. Vol. 44 No. 3, p. 639-642
    Received: Aug 22, 1979
    Accepted: Jan 11, 1980

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Amorphous Material and Aluminum Interlayers in Quebec Spodosols1

  1. C. R. De Kimpe and
  2. M. R. Laverdiere2



Clay fraction from spodic B horizons of Appalachian and Laurentian soils was recovered after organic matter and sesquioxides removal. Sodium citrate and sodium hydroxide further extracted various amounts of Al, Si, and Fe. Samples from the Appalachian sites released < 5% Al2O3 + SiO2 and < 1% Fe2O3. There were only small differences between the amounts of material extracted by both reagents. After citrate treatment, a moderate increase of CEC was observed and related to Al interlayer removal, while after NaOH + citrate treatment the CEC decreased slightly because of amorphous material removal. Samples from the Laurentian sites released from 9.3 to 30.0% Al2O3 + SiO2 in NaOH and subsequently 1.6 to 6.0% Fe2O3 in Na-citrate. The presence of large amounts of amorphous material prevented the identification of clay minerals by X-ray diffraction analysis, and its removal caused a strong decrease of the CEC. Citrate alone extracted this poorly crystalline material at a slower rate and for these samples, this was followed by a decrease of the cation exchange capacity.

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