66 research outputs found
Pressure Dependence of the Oxygen Electrode
ABSTRACT A commercial oxygen electrode (YSI 5750) has been calibrated from 1 to 1500 bar. The theory of the pressure dependence of the electrode processes, the oxygen fugacity, and the membrane permeability is presented. A short treatment of the use of the electrode in measuring kinetic processes under pressure is also given. The activation volume for the diffusion through the membrane has been found to be 58 • 2 cm 3 mole -1. The diffusion is always the rate-determining step. When the increase in oxygen fugacity with pressure is not taken into consideration, the observed activation volume is 25 ~ 2 cm ~ mole -1
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