Rispens R, Oeseburg B, Zock J P, Zijlstra W G
Pflugers Arch. 1980 Jul;386(1):97-9. doi: 10.1007/BF00584195.
Using glass electrode catheters, a decrease in blood plasma pH was found in four dogs when the electrode at the tip of the catheter was passed from central to more peripheral sites of the arterial system. This findings can at least in part be explained by assuming that in the lung capillaries erythrocytes and plasma equilibrate separately with alveolar gas.
