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

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.

¹ Contribution from the Seagram Centre for Soil and Water Sciences, Faculty of Agriculture, The Hebrew Univ. of Jerusalem, Rehovot, POB 12, 76100, Israel.

² Graduate Student, Professor, and Senior Lecturer of Soil Chemistry, The Hebrew University of Jerusalem.

Received for publication June 8, 1982. Accepted for publication May 12, 1983.

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