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This article in SSSAJ

  1. Vol. 47 No. 5, p. 1056-1058
     
    Received: June 8, 1982
    Published: Sept, 1983


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doi:10.2136/sssaj1983.03615995004700050048x

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

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

Abstract

Abstract

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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