Kinetic parameters oxygen electrode process

Thermodynamic and kinetic measurements of the O2 binding process for the heme proteins are essential to discuss their physiological and chemical properties. Representative parameters are depicted in Table 1. The oxygen equilibrium can be directly determined by a polarographic-spectrophotometic method with an O2 electrode. The P50 value, the O2 pressure when half of the heme protein s 02-binding sites are occupied, is quite often used for the... 

The experimental studies of such a reaction performed with pure oxygen have shown, as expected, that its overall rate decreases as the oxygen pressure decreases. When dealing with an electrode where the oxygen pressure is fixed by CO-CO2 mixtures, the observed electrode reaction rates are much higher than those extrapolated from the previous results. As long as no further data are known on the reaction kinetics it would be more reasonable not to look for peculiar variations of reaction-(4)-parameters but to interpret the discrepancy by the fact that another reaction has taken over the role of dominant process. The reaction which has been proposed ... 

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