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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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An Aptamer-based Sensor for Unchelated GadoliniumIII
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An Aptamer-based Sensor for Unchelated GadoliniumIII

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A new selectophore for gadolinium selective sensor.

Hassan Ali Zamani1, Farnoush Faridbod2, Mohammad Reza Ganjali2

  • 1Department of Applied Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran.

Materials Science & Engineering. C, Materials for Biological Applications
|September 2, 2014
PubMed
Summary
This summary is machine-generated.

A new Gadolinium(III) selective sensor was developed using a novel ligand, N

Keywords:
GadoliniumIon selective electrodeNew ionophorePVC membranePotentiometrySensor

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Materials Science

Background:

  • Gadolinium(III) ions are crucial in various fields, including medical imaging and catalysis.
  • Accurate and selective detection of Gadolinium(III) is essential for these applications.
  • Existing methods for Gadolinium(III) detection can be complex or lack selectivity.

Purpose of the Study:

  • To develop a novel, selective, and sensitive sensor for Gadolinium(III) ions.
  • To investigate the performance of a PVC membrane sensor incorporating a specific ligand.
  • To establish the optimal conditions for sensor operation and assess its reliability.

Main Methods:

  • Synthesis and characterization of the N'-(2-oxo-1,2-di(pyridin-2-yl)ethylidene)furan-2-carbohydrazide ligand (L).
  • Construction of a Gadolinium(III) selective PVC membrane sensor using the synthesized ligand.
  • Optimization of membrane composition, including plasticizer (o-nitrophenyloctyl ether) and anion excluders (sodium tetraphenyl borate and oleic acid).
  • Electrochemical characterization of the sensor, including potentiometric measurements to determine Nernstian behavior, detection limit, response time, and applicable pH range.

Main Results:

  • The developed sensor exhibited selective complexation with Gadolinium(III) ions.
  • The sensor demonstrated Nernstian behavior over a wide concentration range (1.0 × 10⁻⁶ to 1.0 × 10⁻² mol L⁻¹).
  • A low detection limit (4.2 × 10⁻⁷ mol L⁻¹), rapid response time (~10 s), and a broad applicable pH range (4.2–8.0) were achieved.
  • The sensor maintained a stable performance for at least 10 weeks and showed accuracy when analyzing certified reference materials.

Conclusions:

  • The synthesized ligand (L) effectively acts as a selective complexing agent for Gadolinium(III) ions.
  • The developed PVC membrane sensor offers a reliable and accurate method for Gadolinium(III) ion determination.
  • This sensor presents a promising tool for Gadolinium(III) analysis in various applications.