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Using Infiltrations of Heptane and Water into Soil Columns to Determine Soil-Water Contact Angles¹

ABSTRACT

A horizontal infiltration procedure using two liquids, water and -heptane, has been presented for determining wetting soil-water contact angles in columns of water-repellent soil. The method can be used to measure contact angles less than, equal to, or greater than 90° and requires minimal reaction time between water and soil during experimental measurements. This technique was applied to two columns of water-repellent Pomello fine sand for six cycles of wetting, leaching, and drying. Wetting contact angles decreased from 101° initially to 91° after the six cycles.

¹ Contribution from Dep. of Soil Science, Univ. of Florida, Gainesville 32601. Research supported in part by Cooperative States Res. Service. Grant No. 716-15-7. Published as Journal Series No. 4735, Florida Experiment Stations.

² Post-doctoral Fellow, Assistant Professor, and Professor, respectively, in Dep. of Soil Science, Univ. of Florida, Gainesville. The first author is currently Associate Professor of Irrigation at Pahlavi University, Shiraz, Iran.

Received for publication December 8, 1972. Accepted for publication January 30, 1973.