Surface Area Determination of Soils by Adsorption of Ethylene Glycol Vapor
1964
Morin, R. E. | Jacobs, H. S.
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.
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