51312-01121-Interpretation of electrochemical noise generated by multiple electrodes

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Product Number: 51312-01121-SG

ISBN: 01121 2012 CP

Author: Michele Curioni

Publication Date: 2012

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The electrochemical potential and current noise generated by an array of galvanically coupled electrodes has been analyzed. It is assumed that the individual current flowing through each of the n electrodes can be measured simultaneously with the potential of the array. For each electrode the apparent noise resistance (impedance) Rn* is determined as the square root of the potential variance (power spectral density) divided by the individual current variance (power spectral density). Depending on the relative noise levels and resistances of electrode n and the remaining n-1 electrodes Rn* may approach closely to the true noise resistance of electrode n Rn be proportional to Rn or be unrelated to Rn. The analysis is facilitated by the introduction of “virtual electrodes” corresponding to a convenient sub-array of real electrodes and obtained by mathematical manipulation of the individual currents in the time or frequency domain. By this approach the validity of the assumptions on the relative magnitude of the noise sources and electrode resistances that are often necessary to evaluate Rn can be partially or completely verified. For example the electrochemical noise data recorded from four identical electrodes and from two dissimilar couples of identical electrode are discussed.