Voltammetry at microcylinder electrodes: Part IV. Normal and differential pulse voltammetry |
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| Affiliation: | 1. Department of Analytical Chemistry, Faculty of Chemistry, Razi University, Kermanshah 671496734, Iran;2. Laboratorio de Desarrollo Analítico y Quimiometría (LADAQ), Cátedra de Química Analítica I, Universidad Nacional del Litoral, Ciudad Universitaria, CC 242 (S3000ZAA), Santa Fe, Argentina;1. Laboratory of Organic Materials and Interfaces, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands;2. Pharmaceutical Analysis, Groningen Research Institute of Pharmacy, University of Groningen, P.O. Box 196, 9700 AD, Groningen, The Netherlands |
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| Abstract: | Expressions for reversible normal pulse (NP) and differential pulse(DP) voltammograms at microcylinder electrodes, which are powerful and convenient tools in in vivo measurements, were derived in connection with the effects of successive pulse electrolysis. These expressions were computed numerically, varying the pulse interval, τ, and the pulse width, δ. Consequently, it was found that the use of τ>10δ for NP and τ>5δ for DP did not distort the well-known shapes of the voltammograms. By choosing τ=10δ for NP voltammetry or τ=5δ for DP voltammetry, the analysis time was greatly reduced. Methods of analysing reversible NP and DP waves are presented. NP and DP measurements were carried out at platinum and carbon fiber microcylinder electrodes for various values of τ and δ. The minimum values of δ for undistorted voltammograms found experimentally were τ = 5δ for NP voltammetry and τ = 2δ for DP voltammetry. |
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