Cesium-selective membrane electrode based on a recently synthesized 16-membered macrocyclic diamide

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Materials Science

Background:

• Accurate detection of Cesium ion (Cs+) is crucial in various environmental and industrial applications.
• Development of selective and sensitive ion-selective electrodes (ISEs) is an ongoing area of research.

Purpose of the Study:

• To prepare and characterize a novel PVC membrane sensor for the selective detection of Cs+ ions.
• To evaluate the sensor's performance in terms of linear dynamic range, sensitivity, response time, and selectivity.

Main Methods:

• Fabrication of a PVC membrane incorporating 1,5-diaza-2,3,4-naphthyl-8,11,14-trioxacyclohexadecane-6,16-dione (L) as the ionophore.
• Electrochemical characterization using potentiometric measurements to determine Nernstian slope, detection limit, and response time.
• Selectivity assessment against various interfering ions including alkali, alkaline earth, and transition metal ions.

Main Results:

• The developed Cs+ sensor exhibited a linear dynamic range from 5.0 x 10(-1) to 6.9 x 10(-6) mol L(-1).
• A Nernstian slope of 59.5 ± 0.8 mV decade(-1) and a detection limit of 4.7 x 10(-6) mol L(-1) were achieved.
• The sensor demonstrated a fast response time (<15 s), operational stability for over 8 weeks, and good selectivity.

Conclusions:

• The novel PVC membrane sensor based on the synthesized ligand demonstrates high performance for Cs+ ion detection.
• The electrode is suitable for practical applications within a broad pH range (4.5-11.0) due to its stability and selectivity.