What is working principle of polarograph?

Answer 1

A polarograph operates on the principle of voltammetry, where it measures the current that flows through an electrochemical cell as a function of an applied potential. It utilizes a dropping Mercury electrode (DME) as the working electrode, which allows for the continuous renewal of the electrode surface. As the potential is varied, different analytes in the solution undergo reduction or oxidation reactions, resulting in characteristic current responses that are recorded as a polarogram. The resulting graph plots current against voltage, enabling the identification and quantification of the analytes based on their unique electrochemical signatures.