A sensitive determination of dopamine in the presence of ascorbic acid using a nafion-coated clinoptilolite-modified carbon paste electrode.
A selective dopamine determination using a nafion-coated clinoptilolite-modified carbon paste electrode in the presence of ascorbic acid was studied. Both cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV) were used for measurements of dopamine. To improve the selectivity of the clinoptilolite-modified carbon paste electrode in presence of a high concentration of ascorbic acid, the electrode surface was coated with nafion membrane. Experimental parameters affecting the determination of dopamine, including the clinoptilolite ratio, nafion membrane thickness, preconcentration time, preconcentration solution pH, stripping solution pH and interferences are discussed. The developed sensor has a wide linear range, a low detection limit, and good stability and reproducibility. The sensor offers a good alternative to existing analytical methods for dopamine, permits a relatively short analysis time, and is simple, selective and inexpensive.
Alpat
Senol
S
Department of Chemistry Education, Dokuz Eylul University, Buca-Izmir, Turkey. senol.alpat@deu.edu.tr
Alpat
Sibel Kilinc
SK
Telefoncu
Azmi
A
D001205:Ascorbic Acid / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D004298:Dopamine / Q000032:analysis*; D004563:Electrochemistry; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D017641:Zeolites / Q000737:chemistry*
D005465:Fluorocarbon Polymers; C083175:clinoptilolite; D017641:Zeolites; C040402:perfluorosulfonic acid; D002244:Carbon; D001205:Ascorbic Acid; D004298:Dopamine