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Surface Area Determination of Soils by Adsorption of Ethylene Glycol Vapor¹

ABSTRACT

Surface area was determined from ethylene glycol (EG) retained by vapor-wetted soils and clays in equilibrium with EG-bentonite or -resin buffers. The method compared favorably with previously proposed equilibrium and nonequilibrium methods.

Only small excesses of EG are adsorbed by vapor-wetted samples. This reduces equilibration time, extends buffer life, and eliminates hysteresis on the drying curve at the monolayer point. The determination is independent of sample size; moderate temperature fluctuations; or moisture present in EG, buffer, or sample. Use of redistilled EG is not necessary.

The monolayer end point can be determined using a series of EG-bentonite buffers independently of other methods. Buffers containing more than a monolayer of EG can be used if suitable corrections are made.

¹ Contribution No. 832, Agronomy Department, Kansas Agr. Exp. Sta., Manhattan.

² Graduate student, now superintendent of North Central Kansas Exp. Fields, Belleville, and Associate Professor, respectively.

Received for publication May 24, 1963. Accepted for publication August 20, 1963.