عنوان المقالة:تصنيع قطب اوكسيد الزنك النانوي لتقدير عنصر الزنك من خلال الفولتائية الدورانية Zinc Metal at a New ZnO Nanoparticles Modified Carbon Paste Electrode: A Cyclic Voltammetric Study.
Emad salaam Abood, Amer Musa Jouda, Muthana Salih Mashkoor
Abstract
A new carbon paste electrode modified with ZnO nanoparticles was prepared and used to study the
electro oxidation of zinc ions in solution by cyclic voltammetry (CV) method. The modified electrode
displayed strong resolving function for the overlapping voltammetric response of zinc into one well-
defined peak. The potential difference between Epa and Epc was > 200 mV, the range of which
referred to the quasi-reversible mechanism. The kinetic of electrode was studied in the range of
temperature 15-30 °C. The data of voltamograms showed the negative shift increased with increase
of temperature, the result of which referred to the diffusion electron transfer in redox process of
zinc oxidation. Diffusion coffining was calculated from Sevcik-Randles equation and thus equaled
-7 -8-8
to 1.01×10 . The rate constant was equal to 5.2×10 and 3.3×10 for oxidation and redaction
respectively. And the peak current of zinc increased linearly with its concentration in the range of 2.0- 20.0 ppm.
ا.م.د عماد سلام عبود | Dr. Emad Salaam Abood | 5799