"Amperometric Batch Injection Analysis: Theoretical Aspects Of Current Transients And Comparison With Wall-jet Electrodes In Continuous-flow"
Electroanalysis
1995 Volume 7, Issue 3 Pages 225-229
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Christopher M. A. Brett, Ana Maria Oliveira Brett, Lucian Costel Mitoseriu
Abstract:
Amperometric detection using the batch injection analysis technique has been studied and compared with the current obtained at the wall-jet electrode under similar conditions using the oxidation of potassium ferrocyanide and the injection of samples of volume 10 to 100 µL. The form of the current transients has been analyzed and compared with the steady-state response at wall-jet disk electrodes. Good agreement is found at high dispension rate, differences at lower dispension rates being ascribed to radial diffusion effects. The importance of tip-electrode distance and injection volume have been evaluated; it is shown that the optimum distance is 3 mm and that maximum sensitivity requires a minimum injection volume of 14 µL. A detection limit of 50 µM using simple amperometric detection is estimated. Implications of these results for the efficient application of amperometric batch injection analysis are discussed.
Theory
