A CO2 TITRATION ELECTRODE .1. THEORETICAL DESCRIPTION

A novel titration electrode for measuring the concentration of CO2 is described in which OH- is generated electrochemically and the time tak en for the OH- to be titrated by the CO2 is measured. A theoretical de scription of the variation of pH with time is presented. The curve is shown to have two inflection points. The pH at the second point of inf lection is close to 8. Hence the time to the second point of inflectio n is the titration time. Results from experiments with known quantitie s of OH- are shown to be in good agreement with the theory.