THE SEVERINGHAUS Pco2 ELECTRODE: A THEORETICAL AND EXPERIMENTAL ASSESSMENT

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Abstract
A systematic experimental and theoretical assessment of the Severinghaus Pco2 electrode has been made with gas, water and blood samples, together with a study of the response dynamics of the apparatus. A number of new recommendations are made on the operation of the electrode including the following. The calomel reference electrode should be maintained at a constant temperature because a change of 1 deg C can produce an error of 4 per cent. A clamp over the whole electrode helps to prevent occasional gross leakage. A procedure is suggested to correct for the remaining steady leakage which occurs with water samples and with blood samples of high carbon dioxide tension. A caution is given against taking readings too early. With these and other precautions an accuracy of ±2½ per cent has been achieved.

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