DETERMINATION OF EPINEPHRINE AT DIFFERENT TYPES OF CARBON PASTE ELECTRODES

作者：Jemelkova Zuzana^*; Barek Jiri; Zima Jiri

来源：Analytical Letters, 2010, 43(7-8): 1367-1376.

DOI：10.1080/00032710903518773

• Carbon paste electrode
• Carbon nanotubes
• Crystal graphite
• Differential pulse voltammetry
• Epinephrine
• Glassy carbon microparticles

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.

• 出版日期2010