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Use of off-chip injection to compare the response of Hg/Au electrodes to the response of bare Au electrodes when both are exposed to discrete 500 nL injections of cysteine. The Hg/Au microelectrode was held at +0.2 V vs. Ag/AgCl for detection of 50 μM cysteine while the bare electrode was held at +1.0 V vs. Ag/AgCl for detection of 1 mM cysteine. Flow rate for both = 1.5 μL min−1.
