Abstract

A liquid membrane ion-selective electrode has been prepared for the measurement of carbonate ion activities in solutions containing high levels of hydrogen carbonate and chloride. The electrode exhibits Nernstian response in the approximate range 1O -2–1O -7 M carbonate, and has a fast response and low noise level under most conditions. In the physiologically important pH region, hydroxide ion does not interfere. Detailed information is given on the composition and properties of the active membrane phase.

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