Selective uranyl ion detection by polymeric ion-selective electrodes based on salphenH2 derivatives

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Materials Science

Background:

• Development of selective sensors for uranyl ions (UO2(2+)) is crucial for environmental monitoring and nuclear fuel reprocessing.
• Existing ion-selective electrodes (ISEs) often lack sufficient selectivity or have limited operational ranges for uranyl detection.

Purpose of the Study:

• To develop novel ion-selective electrodes (ISEs) for the sensitive and selective detection of uranyl ions (UO2(2+)).
• To evaluate the performance characteristics of ISEs incorporating specific salphenH2 derivatives as cation carriers.

Main Methods:

• Synthesis and characterization of salphenH2 derivatives (L1 and L2) as ionophores.
• Fabrication of ISEs using L1 and L2 with tris(2-ethylhexyl)phosphate (TEHP) as a plasticizer.
• Potentiometric measurements to assess selectivity, response range, pH influence, response time, and detection limit for uranyl ions.

Main Results:

• The developed ISEs exhibited near Nernstian slopes over a wide uranyl ion concentration range (1.0 x 10(-6) to 1.0 x 10(-2) M).
• Optimal performance was observed in the pH range of 1.0 to 5.0 with response times under 20 seconds.
• High selectivity for uranyl ions over other cations was achieved, attributed to selective complexation and lipophilic properties of the ionophores (especially L2).
• A low detection limit of 6.5 x 10(-7) M for uranyl ions was obtained.

Conclusions:

• SalphenH2 derivatives L1 and L2 are effective cation carriers for developing selective uranyl ion-selective electrodes.
• The proposed ISEs demonstrate excellent performance characteristics, including wide working range, fast response, and high selectivity.
• These sensors are suitable for the potentiometric determination of uranyl ions, showing promise for various analytical applications.