Electrochemical behavior study of salicylic acid following azo dye formation with 2,4-dinitrophenylhydrazine: Analytical evaluation

6^th International Conference and Exhibition on Materials Science and Chemistry

May 17-18, 2018 | Rome, Italy

W Boumya, F Laghrib, S Lahrich, A Farahi, M Achak, M Bakasse and M A El Mhammedi

Universite Hassan-Ier, Morocco
Chouaib Doukkali University, Morocco
Ibn Zohr University, Morocco

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

A new simple, accurate and cost-effective chronoamperometry (CA) based approach coupled with azo coupling reaction has been put forward for quantitative analysis of salicylic acid. The reaction involves a two-step process of oxidation of the 2,4-dinitrophenylhydrazine (DNPH) by potassium iodate to give a 2,4-dinitrophenylhydrazinium cation at 0â��5�°C and coupling with salicylic acid (SA) to form red salicylic acid-derived azo dye. Electrochemical impedance spectroscopy, square wave voltammetry and chronoamperometry methods were used to characterize the electrochemical behavior of the salicylic acid-derived azo dye. Studies on different variables affecting the reaction were optimized. Under the optimal conditions, amperometric studies showed that the current response exhibits a wide linearity range from 0.1 to 0.0005 mmolL-1 for SA and the limit of detection and quantification are found to be 0.0001 and 0.0015 mmolL-1 (S/N = 3 & 10) respectively. Therefore, the developed method was successfully applied for routine determination of SA in pharmaceutical samples. wafaa-angel@hotmail.fr