1Department of Chemistry, Cauvery College for Women, Trichy-18. Tamilnadu, India
2Department of Chemistry, V.S.B. Engineering College, Karur, Tamilnadu, India
A novel modified electrode was fabricated by electrochemical derivatization of CdHCF at a GNP adsorbed graphite wax composite electrode. The electrode developed was used for the determination of dopamine. The voltammetric characteristics of the CdHCF modified electrode in the presence of different alkali metal cations were investigated by cyclic voltammetry (CV). The modified electrode was also characterized by electrochemical impedance method (EIS). The electrode surface was characterized by scanning electron microscopy (SEM) which indicated that the CdHCF particles were 50–70 nm in size and were dispersed uniformly on electrode surface. The CdHCF modified electrodes presents good electrocatalytic activity towards the oxidation of dopamine and this electrode can be used for determination of dopamine. A linear calibration curve is obtained in the range from 2.6×10−6 to 7.2×10−3M of dopamine with a detection limit of 1×10−7M. Chronoamperometry and differential pulse voltammetry (DPV) were used for the determination of dopamine from industrial waste water samples. The proposed modified electrode is simple to prepare and it shows fast response, good stability and reproducible results.
GNP, Cadmium hexacyanoferrate, Electro catalysis, Dopamine
