Investigating The Effect of Substitution on The Efficiency of Some Hydrazone Ligands in Using Them as Ionophores in The Construction of Membrane Sensors for Cr3+ Ions

Moblsaz Fard, Hediye; Mizani, Farhang; Heydari, Neda

doi:10.22034/abec.2024.716175

Investigating The Effect of Substitution on The Efficiency of Some Hydrazone Ligands in Using Them as Ionophores in The Construction of Membrane Sensors for Cr3+ Ions

Document Type : Original Article

Authors

Hediye Moblsaz Fard

Farhang Mizani

Neda Heydari

Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, Iran

10.22034/abec.2024.716175

Abstract

Chromium is a metallic element that is used in various industries. Because when chromium is placed in the environment, it is possible to be absorbed by humans and other environmental receptors, which is why the control of this element is very important. Ion-selective electrodes are commonly used today to measure a large number of cations and anions, which do not have some of the problems of the other analytical methods. In this study, to design and build a new chromium ion-selective potentiometric sensor, two ligands (E)-4-amino-N'-(5-bromo-2-hydroxybenzylidene) benzohydrazide (LP5) and (E)-4-amino-N'-(2-hydroxy-3-methoxybenzylidene) benzohydrazide (LP7) was used as ionophores. Then, two ligands used as ionophores were compared in terms of performance and efficiency, and finally the best ionophore was selected for further experiments. The potentiometric responses of electrodes for both ligands were without any changes in the pH range of 2.5 to 10. The electrode with LP5 ligand showed a detection limit of 9.8×10^-8 and the LP7 ligand showed a detection limit of 9.5×10^-8. As a result, the LP7 ligand indicates a favorable selectivity toward the Cr³⁺ ion. The optimal composition of the membrane that led to the desired results was 8% ionophilic, 4% additive, 64% plasticizer, and 24% PVC powder.

Keywords

Ion selective electrodes

PVC-membrane

Chromium (III) ions

Hydrazone ligands

Potentiometric sensor

Subjects