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An examination was made of the effect of electrode polishing on the direct pulsed amperometric detection (PAD) and indirect PAD response to penicillin G. The polishing procedure produced a temporary loss of sensitivity for both types of PAD, which over time relaxed back to higher levels. A temporary increase in the electrode kinetics can be observed as well, particularly for a PAD waveform in the...
It is well known that alterations of the times and potentials of each step within a PAD waveform can alter the sensitivity of the amperometric response, peak shape has also been found to vary with waveform adjustments. This work studied the variation in both peak heights and peak tailing as a function of waveform alterations for penicillin G oxidation in flow injection analysis. Large variations...
Dissolved oxygen can be reduced on platinum and gold electrodes, although the presence of adsorbing species can attenuate the amount of cathodic current observed. By monitoring the degree that the current is suppressed, one can indirectly monitor the concentration of the adsorbate. This type of quantitative procedure can be done on both metals, with platinum giving a larger residual reduction signal...
Aided by the construction of a custom potentiostat, a series of different PAD waveforms were compared to find the optimum detector for penicillin oxidation. The waveforms included standard 3-step direct and indirect PAD in addition to reverse-PAD and 4-step PAD. Two new waveforms, the indirect reverse-PAD and the 4-step indirect PAD were examined in the study. Under the solvent conditions of the...
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