Pseudo Cavity of Schiff Base Ionophore Incorporated in Screen Printed Electrode for Sensing of Zn (II). Issue 6 (8th April 2019)

• Record Type: Journal Article
• Authors: Rana, Sonia; Mittal, Susheel K; Kaur, Navneet; Banks, Craig E.
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 6(2019)
• Page Start: B464
• Page End: B471
• Publication Date: 2019-04-08
• Subjects: Electroanalytical Electrochemistry -- Sensors -- cyclic voltammetry -- Zn2+ in food samples -- Modified screen printed electrode -- Schiff base ionophore -- electrochemical sensor; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1041904jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : An electrochemical sensor for Zn 2+ ions in aqueous medium has been developed using disposable screen printed electrodes (SPE). Working electrode of the screen printed electrode has been modified using an ionophore (SMS-3) having schiff base moiety. Surface modification and redox behavior of the SMS-3 modified SPE has been compared with unmodified SPE using Scanning Electron Microscopy (SEM) and Cyclic Voltammetry (CV). Herein, we discovered that modified SPE showed good electrochemical signals and sensitivity toward metal ions. The characteristic cathodic peaks at −0.59 V and 0.55 V of the ionophore was quenched in the presence of Zn 2+ . SMS-3 modified SPE works in the detection range of 0.47 to 5.56 μM with a limit of detection (LOD) 0.92 μM. DFT studies on SMS-3 supported the observations for the modified SPE. Further, sensitivity and selectivity of the electrode were also examined in the presence of various interfering ions and found that these ions did not interfere in the detection of Zn 2+ ions. The electrodes were applied for the detection of Zn 2+ in food samples.