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Soil Science Society of America Journal Abstract -

Oven Drying as a Pretreatment for Surface-Area Determinations of Soils and Clays1


This article in SSSAJ

  1. Vol. 47 No. 5, p. 1056-1058
    Received: June 8, 1982
    Accepted: May 12, 1983

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  1. Yael Ratner-Zohar,
  2. A. Banin and
  3. Y. Chen2



Various procedures for drying soil and clay samples prior to surface area determination have been compared. The study was conducted on various soils—kaolinite, illite, and a number of minerals representing the smectite group. This research showed that 24 h of oven drying rather than P2O5 drying can be applied as a pretreatment for surface-area determinations of soils and clays by the ethylene glycol monoethyl ether (EGME) method with the exception of illite and illitic soils. Surface-area determinations following the two drying procedures were highly significantly correlated (at the 1% level) for smectites and soils, exhibiting coefficients of 0.996 and 0.986, respectively, between the oven- vs. P2O5 drying. Oven drying results in a 15% decrease in surface area of illite, suggesting that this procedure would not be recommended as a pretreatment for measurements on soils rich in illites. The oven drying procedure saves 4 to 5 d of the surface-area determination procedure and is applicable to smectites and soils rich in montmorillonite and kaolinite.

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