By Wang Joseph
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Additional resources for Analytical Electochemistry. Second Edition
In particular, fast-scan (1000 V sÀ1 ) background-subtracted cyclic voltammetry is seeing increased use for the in-vivo monitoring of neurotransmitters (such as dopamine or serotonin) in the brain. Such coupling of digital background subtraction and fast voltammetric measurements provides the subsecond temporal resolution necessary for detecting dynamic concentration changes in the micromolar range occurring in the extracellular environment of the brain. The good temporal and chemical resolution of such in-vivo cyclic voltammetric experiments offers improved understanding of the chemistry of the brain.
The extraction of such information commonly requires background subtraction to correct for the large charging current contribution associated with ultrafast scan rates. A special case of the EC mechanism is the catalytic regeneration of O during the chemical step: O neÀ R 2-8 RA O 2-9 An example of such a catalytic EC process is the oxidation of dopamine in the presence of ascorbic acid (4). The dopamine quinone formed in the redox step is reduced back to dopamine by the ascorbate ion.
Note that the continuous change in the surface concentration is coupled with an expansion of the diffusion layer thickness (as FIGURE 2-2 Typical cyclic voltammogram for a reversible O neÀ R redox process. 30 STUDY OF ELECTRODE REACTIONS FIGURE 2-3 Concentration distribution of the oxidized and reduced forms of the redox couple at different times during a cyclic voltammetric experiment corresponding to the initial potential (a), to the formal potential of the couple during the forward and reversed scans (b, d), and to the achievement of a zero reactant surface concentration (c).
Analytical Electochemistry. Second Edition by Wang Joseph