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Selective electrodes for silver based on polymeric membranes containing cali.

L Chen1, X Zeng, X He

  • 1Department of Chemistry, Nankai University, Tianjin, China.

Fresenius' Journal of Analytical Chemistry
|February 28, 2001
PubMed
Summary
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New silver ion-selective electrodes were developed using calixarene derivatives. These sensors show excellent Nernstian response and high selectivity for silver ions, enabling precise detection and titration applications.

Area of Science:

  • Electroanalytical Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Development of ion-selective electrodes (ISEs) is crucial for accurate ion concentration measurements.
  • Calixarene derivatives offer unique structural properties for host-guest complexation, making them promising for sensor applications.
  • Efficient detection of silver ions (Ag+) is important in environmental monitoring and industrial processes.

Purpose of the Study:

  • To synthesize and characterize novel calix[4]arene derivatives for use in silver ion-selective electrodes.
  • To evaluate the electrochemical performance, including Nernstian response and selectivity, of the developed electrodes for silver ions.
  • To assess the applicability of the electrodes in potentiometric titrations.

Main Methods:

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  • Polymeric membranes were prepared using two specific calix[4]arene derivatives functionalized with hydroxy and benzothiazolylthioethoxy groups.
  • Potentiometric measurements were conducted to determine the response of the electrodes to silver ion activity.
  • Selectivity assessments were performed against various alkali, alkaline earth, and transition metal ions.
  • The electrode was employed as an indicator electrode in silver ion titrations with chloride ions.

Main Results:

  • The prepared silver ion-selective electrodes exhibited a consistent Nernstian response of 58 mV decade(-1).
  • A wide activity range from 5 x 10(-6) M to 10(-1) M was observed for silver ion detection.
  • The limit of detection for silver ions reached as low as 10(-5.8) M.
  • High selectivity was demonstrated against common interfering ions, including alkali, alkaline earth, and some transition metals.
  • The electrode performed effectively as an indicator in silver ion titrations with chloride ions.

Conclusions:

  • The novel calix[4]arene-based polymeric membranes provide a robust platform for highly selective and sensitive silver ion detection.
  • The developed electrodes offer excellent Nernstian behavior and low detection limits, suitable for various analytical applications.
  • These electrodes are viable for use in complexometric titrations, demonstrating their practical utility in quantitative analysis.