A novel CdTe quantum dots‐modified carbon paste electrode (QDMCPE) was fabricated and used to study the electrooxidation of dopamine and uric acid and their mixtures by electrochemical methods. Using square wave voltammetry (SWV), a highly sensitive and simultaneous determination of dopamine and uric acid was explored at the modified electrode. SWV peak currents of dopamine and uric acid increased linearly with their concentrations in the ranges of 7.5×10−8–6.0×10−4 M, and 7.5×10−6–1.4×10−3 M, respectively. Finally this new sensor was used for determination of dopamine and uric acid in some real samples.
The electrochemical oxidation of hydroxylamine on the surface of a carbon paste electrode modified with carbon nanotubes and 2,7-bis(ferrocenyl ethyl)fluoren-9-one is studied. The electrochemical response characteristics of the modified electrode toward hydroxylamine and phenol were investigated. The results showed an efficient catalytic activity of the electrode for the electro-oxidation of hydroxylamine, which leads to lowering its overpotential. The modified electrode exhibits an efficient electron-mediating behavior together with well-separated oxidation peaks for hydroxylamine and phenol. Also, the modified electrode was used for determination of hydroxylamine and phenol in some real samples.
The electrochemical behaviour of hydrazine at a 1-benzyl-4-ferrocenyl-1H-[1,2,3]-triazole-triazole/carbon nanotube modified glassy carbon electrode has been studied. The modified electrode shows an excellent electrocatalytic activity for the oxidation of hydrazine and accelerates electron transfer rate. The electrocatalytic current increases linearly with hydrazine concentration in the range 0.5-700.0 mM and the detection limit for hydrazine was 33.0 AE 2.0 nM. The diffusion coefficient (D = 2.5 AE 0.1 Â 10 À5 cm 2 s À1 ) and kinetic parameters such as the electron transfer coefficient, (a = 0.52) and the heterogeneous rate constant (k 0 = 5.5 AE 0.1 Â 10 À3 cm s À1 ) for hydrazine were determined using electrochemical approaches. Finally, the method was employed for the determination of hydrazine in water samples.
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