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A Steady-State Method for Laboratory Measurement of the Oxygen Diffusivity of Porous Materials¹

ABSTRACT

A steady-state system using a large membrane-covered electrode as a quantitative oxygen reducing sink and small membrane-covered electrodes to measure oxygen concentrations was devised for measuring the oxygen diffusion coefficient D of soil or other porous material artificially packed in a sample-holding tube. With this system, D was measured both with a zero net nitrogen flux through the sample in a close-end system and with the counter-current molar fluxes of oxygen and nitrogen made equal by injecting nitrogen into the system. For 100µ and 300µ diameter glass beads these methods gave values of D that agreed within 3% and were within 8% of values of D measured with a transient method for the same samples. Diffusion coefficients determined for air were in the range of those reported in literature.

¹ Department of Soils, University of Wisconsin, Madison. Published with the permission of the Director of Wisconsin Agr. Exp. Sta. Contribution from the Wisconsin Agr. Exp. Sta. as a collaborator under Regional Cooperative Research Project NC-17, entitled "The Value of Organic Matter and of Various Soil and Crop Management Practices in Improving Soil Structure and Other Factors Affecting Productivity." Presented before Div. S-1 and S-2, SSSA Meeting, Nov. 17–21, 1963, Denver, Colo.

² Formerly Research Assistant, University of Wisconsin; now Soil Physicist, USDA, ARS, SWC, at Raleigh, N.C.; and Professor of Soils, University of Wisconsin, Madison, respectively.

Received for publication April 20, 1964. Accepted for publication July 8, 1964.