Lanthanide Recognition: an Asymetric Erbium Microsensor Based on a Hydrazone Derivative

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Materials Science

Background:

• Selective detection of specific metal ions is crucial in various scientific fields.
• Developing sensitive and reliable ion-selective electrodes (ISEs) remains an active area of research.

Purpose of the Study:

• To develop a highly selective and sensitive microelectrode for Erbium(III) ions.
• To investigate the potential of N'-(2-hydroxy-1,2-diphenylethylidene)benzohydrazide (HDB) as a neutral ion carrier.

Main Methods:

• Synthesis and characterization of N'-(2-hydroxy-1,2-diphenylethylidene)benzohydrazide (HDB).
• Construction and optimization of a poly(vinyl chloride) (PVC) membrane microelectrode using HDB.
• Electrochemical performance evaluation including response, linearity, pH range, and detection limit.

Main Results:

• HDB demonstrated high selectivity for Erbium(III) ions over thirteen other lanthanide and metal ions.
• The optimized Er(III) microelectrode exhibited a near Nernstian response (17.5±0.5 mV/decade) over a wide linear range (1.0×10⁻³–3.0×10⁻¹⁰ M).
• The microelectrode operated effectively within a pH range of 3.0–9.0 with a lower detection limit of 2.0×10⁻¹⁰ M.

Conclusions:

• N'-(2-hydroxy-1,2-diphenylethylidene)benzohydrazide (HDB) is an excellent neutral ion carrier for constructing selective Erbium(III) microelectrodes.
• The developed microelectrode offers a sensitive, selective, and reliable method for Erbium(III) ion determination.
• This research contributes to advancements in ion-selective electrode technology for rare earth element analysis.