Highly Sensitive and Selective Chromium Oxide Nanoparticles Modified Carbon Paste Membrane Electrode to Determine Cr Concentration in Different Solutions

Emad Salaam Abood, Ahmed Salim Abed, Zahraa Salman



Chromium ions in the solution were electro-oxidized using a novel carbon paste electrode containing Cr2O3 nanoparticles. As a result of the modification, the voltammetric response of Cr-ion could be resolved into one well-defined peak. As a result, the quest-reversible mechanism was activated. Researchers investigated the electrode's kinetics between 20 and 30 degrees Celsius. In the redox process of Cr-ion oxidation, the voltammogram data indicated a rise in temperature that increased negative shift, which implied diffusion electron transfer. The Randles-Sevcik equation gave a diffusion coefficient of 1.9 x10-3; the rate constant K was 0.3x10-3; and According to the study, In the range of 2-10 ppm, the peak current of Cr-ion rose linearly with its concentration, thermodynamic and kinetic parameters was calculated such as ∆E, ∆H, ∆G and ∆S equal to -58.2, -4.9, -65.1 and 0.11 KJ/mol respectively. 

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Nano Biomedicine and Engineering.

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