A novel fluorescent cesium ion-selective optode membrane based on 15-crown-5-anthracene

Area of Science:

• Analytical Chemistry
• Chemical Sensing
• Materials Science

Background:

• Accurate determination of cesium ions is crucial in various environmental and biological applications.
• Development of selective and sensitive sensors is essential for real-time monitoring.
• Optode technology offers a promising approach for ion detection.

Purpose of the Study:

• To develop a novel fluorescent optode system for the determination of cesium ions.
• To investigate the performance characteristics of the developed optode system, including sensitivity, selectivity, and response time.
• To establish optimal experimental conditions for cesium ion measurement using the fluorescent optode.

Main Methods:

• Fabrication of a plasticized polymer membrane incorporating a cesium ion-selective fluoroionophore (15-crown-5 derivative with anthracene) and lipophilic anions.
• Measurement of emission intensity at 500 nm (excitation at 360 nm) in Tris-HCl buffer.
• Optimization of experimental parameters such as pH and concentration range.
• Evaluation of selectivity against other cations (K+, Na+, Li+), response time, and reproducibility.

Main Results:

• The fluorescent optode system demonstrated a linear response of relative fluorescence intensity with cesium ion concentration from 1.0 × 10(-4) M to 1.0 × 10(-1) M.
• A low detection limit of 4.2 × 10(-5) M for cesium ions was achieved.
• The optode system exhibited high selectivity and sensitivity for cesium ions over other common cations.
• The effects of pH, response time, and reproducibility were investigated and discussed.

Conclusions:

• A highly selective and sensitive fluorescent optode system for cesium ion determination has been successfully developed.
• The developed optode system shows potential for practical applications in cesium ion analysis.
• Further studies can focus on optimizing membrane composition and exploring real-world sample analysis.