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Paper-based thin-layer coulometric sensor for halide determination.

Maria Cuartero1, Gastón A Crespo, Eric Bakker

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.

Analytical Chemistry
|January 8, 2015
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Summary
This summary is machine-generated.

This study introduces a simple paper-based analytical device (PAD) for accurately measuring halide ions in water and food. The novel sensor offers a cost-effective and portable solution for environmental and nutritional analysis.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Materials Science

Background:

  • Accurate halide determination is crucial for water quality and nutritional analysis.
  • Existing methods can be complex, costly, and require laboratory settings.

Purpose of the Study:

  • To develop a paper-based analytical device (PAD) for the absolute determination of halides (chloride, bromide, iodide).
  • To establish a simple, cost-effective, and portable sensor for diverse sample types.

Main Methods:

  • Utilized a paper-based analytical device with a cellulose paper layer, cation-exchange membrane, and silver-foil electrode.
  • Employed cyclic voltammetry (0–0.8 V) at moderate scan rates (10 mV s⁻¹) for halide plating and re-reduction.
  • Optimized electrochemical cell parameters for sensitivity and resolution.

Main Results:

  • Achieved absolute determination of chloride, bromide, and iodide in concentrations ranging from 10⁻⁵ to 0.6 M.
  • Demonstrated a limit of detection of 10⁻⁵ M for halides.
  • Successfully analyzed halides in various water samples (sea, tap, river, mineral) and food supplements.

Conclusions:

  • The developed PAD offers a highly sensitive, selective, and robust method for halide quantification.
  • The device's simplicity, low cost, and portability facilitate on-site analysis outside traditional laboratory environments.
  • This technology holds promise for routine environmental monitoring and food safety applications.