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

Abstract

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 C2‐C3 bond of katiragum with sodium meta periodate (NaIO4) to obtain katiragum dialdehyde (KGD), followed by condensation between KGD and an α‐amino acid (L)‐tryptophan. KGD and KGDT are characterized by 1HNMR, 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.