Final answer:
The Clark electrode measures oxygen concentration in solutions by producing a current that is proportional to the oxygen levels, which is then measured.
Step-by-step explanation:
The electrode is an analytical device used primarily to measure oxygen concentration in solutions, operating on the principles of electrochemistry.
Its functionality is based on the reduction of oxygen at a platinum cathode within an electrolytic solution.
When oxygen diffuses through a membrane and reaches the cathode, a current is produced that is proportional to the concentration of oxygen.
This current is then measured to determine the oxygen levels in the sample.
The Clark electrode can also measure dissolved oxygen in blood, which is vital in various medical and biological applications.