Selective and efficient electrochemical sensing of Cd2+ ions and hydroquinone in aqueous medium by katiragum dialdehyde-tryptophan Schiff base modified glassy carbon electrode

Katiragum dialdehyde-tryptophan Schiff base (KGDT) is developed for selective and efficient detection of Cd2+ ion and hydroquinone (HQ) in the aqueous medium by electrochemical method. KGDT is synthesized by selectively oxidizing the C-2-C-3 bond of katiragum with sodium meta periodate (NaIO4) to obtain katiragum dialdehyde (KGD), followed by condensation between KGD and an alpha-amino acid (L)-tryptophan. KGD and KGDT are characterized by (HNMR)-H-1, HRMS, and FESEM with EDAX analysis. The electrochemical experiment is carried out by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. The electrochemical sensing toward the Cd2+ ion in the DPV method is found to be better compared to the CV method. In the CV method, the limit of detection (LOD) values of Cd2+ ion and HQ are calculated as 8.84 nm and 15.91 nm, respectively. In the DPV method, the LOD values of Cd2+ ion and HQ are found to be 7.24 nm and 15.29 nm, respectively. The proposed sensor, KGDT/GCE, shows satisfactory results in the stability and reproducibility test and also shows excellent practical applicability in real sample analysis.