By Wang Joseph
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Additional info for Analytical Electochemistry. Second Edition
In the extreme case, the chemical reaction may be so fast that all of R will be converted to Z, and no reverse peak will be observed. A classic example of such an EC mechanism is the oxidation of the drug chlorpromazine to form a radical cation that reacts with water to give an electroinactive sulfoxide. , of iron porphyrin complexes) occurring after electron transfer represent another example of such a mechanism. , adjusting the experimental time scale). In particular, the scan rate controls the time spent between the switching potential and the peak potential (during which the chemical reaction occurs).
Maloy, J. Chem. , 60, 285 (1983). 2. G. Smith, Laplace Transform Theory, Van Nostrand, London, 1966. 3. G. Compton, J. Eklund, and F. Marken, Electroanalysis, 9, 509 (1997). 4. P. Grundler, and A. Kirbs, Electroanalysis, 11, 223 (1999). 4a. J. G. Compton, Anal. , 72, 198A (2000). 5. D. Grahame, Chem. Rev. 41, 441 (1947). 6. A. Swietlow, M. Skoog, and G. Johansson, Electroanalysis, 4, 921 (1992). 7. C. Grahame, Annu. Rev. Phys. , 6, 337 (1955). 8. D. Mohilner, Electroanal. , 1, 241 (1966). 9. O'M.
During the potential sweep, the potentiostat measures the current resulting from the applied potential. The resulting plot of current versus potential is termed a cyclic voltammogram. The cyclic voltammogram is a complicated, time-dependent function of a large number of physical and chemical parameters. Figure 2-2 illustrates the expected response of a reversible redox couple during a single potential cycle. It is assumed that only the oxidized form O is present initially. Thus, a negative-going potential scan is chosen for the ®rst half-cycle, starting from a value where no reduction occurs.
Analytical Electochemistry. Second Edition by Wang Joseph