What does the Clark electrode measure?

The Clark electrode is specifically designed to measure the partial pressure of oxygen (pO2) in a solution. This device works based on the principles of electrochemistry, where it utilizes an oxygen-permeable membrane to allow molecular oxygen to diffuse to a cathode, resulting in a reduction reaction. As oxygen molecules reach the electrode, they are reduced, and the resulting current is directly proportional to the concentration of oxygen present, enabling the determination of its partial pressure.

This is particularly useful in various applications such as blood gas analysis and physiological monitoring, where knowing the oxygen levels is crucial. The precision and sensitivity of the Clark electrode make it a valuable tool in clinical settings, especially in measuring arterial or venous blood oxygen levels, which are essential for assessing respiratory function and overall metabolic status.