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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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A novel ion selective sensor for promethium determination.

Vinod K Gupta¹, Rajeev Jain, A J Hamdan

¹Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India. vinodfcy@iitr.ernet.in

Analytica Chimica Acta

|November 2, 2010

Summary

This study introduces a novel promethium ion-selective sensor using Schiff base ligands. Optimized membranes show excellent performance for detecting promethium (III) in water samples.

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Area of Science:

Electroanalytical Chemistry
Sensor Technology
Rare Earth Element Analysis

Background:

Accurate determination of promethium (Pm) is crucial for nuclear waste management and research.
Development of selective and sensitive sensors for Pm(III) ions is an ongoing challenge.
Schiff base ligands offer potential as selective ionophores in chemical sensors.

Purpose of the Study:

To develop and characterize the first ion-selective sensor for promethium (Pm) ions using Schiff base ligands.
To investigate the influence of various plasticizers and anion excluders on sensor performance.
To evaluate the sensor's applicability in real-world sample analysis.

Main Methods:

Synthesis and comparative study of two Schiff base ligands (X(1) and X(2)) as neutral ionophores.
Fabrication of membrane-based ion-selective electrodes (ISEs) with varying compositions.
Optimization of membrane components including plasticizers (e.g., o-NPOE) and anion excluders (e.g., KTpClPB).
Electrochemical characterization using potentiometric measurements to determine response characteristics.

Main Results:

The optimized membrane sensor (5:5:30:60 ionophore:KTpClPB:PVC:o-NPOE) demonstrated superior performance.
Sensor 8 exhibited a wide working concentration range (4.5×10⁻⁷–1.0×10⁻² M) with a detection limit of 3.2×10⁻⁷ M and a Nernstian slope of 20.0±0.5 mV/decade.
The sensor maintained satisfactory performance in partially non-aqueous media (up to 10% methanol, ethanol, acetonitrile).

Conclusions:

The developed Schiff base ligand-based sensor provides a sensitive and selective method for promethium ion detection.
The sensor is suitable for the determination of Pm(III) in spiked water samples, demonstrating practical analytical utility.
This work represents a significant advancement in the field of rare earth element sensing technology.