Reduction organic materials, near electrodes

Response of water might be probable initial event of an organism s response to mild exposure this is probably connected to high sensitivity of oxidation-reduction processes in water media to action of external factors. Such features as electronic work function, zero charge potential, electrode potential, etc. are connected to concept of electrochemical processes. For this reason, the structure of near-electrode layer will depend on nature of electrodes material and specific nature of its interaction with solvent [8]. 

One of the limitations of using electrodes as detectors is that many electroactive substances do not react at the electrode surface easily, causing variations in response with time. This problem can be overcome by utilizing highly reversibly electroactive substances (known as mediators) as intermediates between the analyte and electrode. Some common mediators are ferrocene, phenazine methosulfate, and benzylviologen. Since different organic materials have different potentials where they react in the electrode, is necessary to choose a mediator that has an oxidation/reduction potential that is near the oxida-tion/reduction potential of the analyte. 

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