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A Comparison Between Mercury Injection and Nitrogen Sorption as Methods of Determining Pore Size Distributions¹

ABSTRACT

A comparison of mercury injection and nitrogen sorption methods of pore size distribution analysis was made on a sample of goethite using the slit-shaped pore model. Using the commonly accepted contact angle of 140° for mercury, the mercury pore-size distribution plot is displaced by approximately 20% in plate separation with respect to the nitrogen plot. The assumption of a contact angle of 153° for mercury is required to make the plots coincide. This value is regarded as not unrealistic. Combination of the two techniques provide a useful method of pore size distribution analysis over a continuous range of pore sizes from 10Å to 50µm. This approach is particularly appropriate to the investigation of the pore structure of soil materials.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, University of Western Australia, Nedlands, W. Australia 6009.

² Research Officer, Senior Lecturer in Soil Science, and Professor of Soil Science, respectively, Department of Soil Sci. and Plant Nutrition, Univ. of Western Australia, Nedlands, W. Australia 6009.

Received for publication January 2, 1973. Accepted for publication April 3, 1973.