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Current Amplification with Signal Averaging at Steady‐State Microelectrodes
Author(s) -
Zoski Cynthia G.,
Rodgers Robert S.
Publication year - 2000
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(20000401)12:6<420::aid-elan420>3.0.co;2-q
Subject(s) - microelectrode , potentiostat , current (fluid) , signal (programming language) , steady state (chemistry) , preamplifier , analytical chemistry (journal) , diffusion , electrode , ferrocyanide , materials science , chemistry , optoelectronics , electrochemistry , amplifier , physics , chromatography , computer science , thermodynamics , cmos , programming language
An approach for measuring picoampere currents at a steady‐state microelectrode is described. A commercial current preamplifier, interfaced to a PAR273 potentiostat, is used to amplify the current while a real‐time‐average digital filter discriminates against noise. The steady‐state voltammogram for the oxidation of a 48 µM solution of ferrocyanide in 1 M KCl at a platinum microdisk electrode is found to have an experimental diffusion‐limited current and Tomes potential separation within 2% and 4%, respectively, of theoretical values. The approach will be useful for potentiostats without picoampere measuring capability.