Explain the different types of current used in polarography?

Question: Explain the different types of current used in polarography?

Polarography is an electrochemical technique that utilizes a potential sweep to study the behavior of analytes in a solution. There are two types of current used in polarography: (1) direct current (DC), also known as direct current voltammetry, where the potential is linearly scanned with time, and (2) alternating current (AC), also known as alternating current polarography, where the potential is modulated at a high frequency. In AC polarography, the current is measured at the fundamental frequency and at higher harmonic frequencies, allowing for the detection of low concentrations of analytes. DC polarography, on the other hand, is used to study the reduction behavior of electroactive species and can be used to determine the half-wave potential and diffusion coefficient of analytes.

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