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Membrane-Covered Electrode for Measurement of Oxygen Concentration in Soil¹

ABSTRACT

The membrane-covered polarographic electrode has been modified to permit a continuous in situ measurement of the oxygen concentration (partial pressure) of soil air. The modifications include temperature compensation (for a 30°C. temperature range) and a probe design that permits sealing in a soil access tube. The temperature-compensated signal is proportional to oxygen concentration and is about 20 mv. in atmospheric oxygen. The (1/e) time constant of the probe following a step change in oxygen concentration is minute. The relative error for routine measurements is about 2%. General design features of the probe and example measurements are presented.

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."

² Graduate Assistant and Professor of Soils, respectively.

Received for publication September 7, 1962. Accepted for publication May 8, 1963.