What type of electrochemical measurement is used by the PCO2 electrode?

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Multiple Choice

What type of electrochemical measurement is used by the PCO2 electrode?

Explanation:
The PCO2 electrode works by sensing a change in hydrogen ion activity with a pH electrode, so it is potentiometric. CO2 diffuses through a gas-permeable membrane into a bicarbonate buffer, forming carbonic acid and lowering the pH of the solution. The glass pH electrode converts this pH change into an electrical potential, which the analyzer translates into pCO2. This type of measurement relies on voltage (potential) rather than a current from a redox reaction or a light signal, which is why it’s not amperometric or optical (and not coulometric).

The PCO2 electrode works by sensing a change in hydrogen ion activity with a pH electrode, so it is potentiometric. CO2 diffuses through a gas-permeable membrane into a bicarbonate buffer, forming carbonic acid and lowering the pH of the solution. The glass pH electrode converts this pH change into an electrical potential, which the analyzer translates into pCO2. This type of measurement relies on voltage (potential) rather than a current from a redox reaction or a light signal, which is why it’s not amperometric or optical (and not coulometric).

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