| Abstract: | The voltammetric behavior of epinephrine was investigated by differential pulse voltammetry (DPV) at a carbon paste electrodes (CPE) made of different carbon powders – CR-2, glassy carbon (GC) microparticles, and single-wall carbon nanotubes (SWNT). In Briton-Robinson (BR) buffer solution pH 6, the linear dependence was found for the determination of epinephrine by the given method in the concentration ranges of 1·10?6–1·10?4 (CR-2), 1·10?6–1·10?4 (GC microparticles) and 4·10?6–1·10?4 (SWNT) mol·dm?3. Limits of detection were 8·10?7, 8·10?7, and 2·10?6 mol·dm?3, respectively. The best results were obtained employing CPE containing carbon paste with 50% (m/m) of SWNT, a linear dynamic range being 4·10?7–1·10?4 mol·dm?3 and a limit of detection 2·10?7 mol·dm?3. The attempt to increase the sensitivity by adsorptive accumulation of epinephrine was not successful. |
