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Related Experiment Videos

Redox-iodometry: a new potentiometric method.

Waldemar Gottardi1, Jörg Pfleiderer

  • 1Institute of Hygiene and Social Medicine, Innsbruck Medical University, 6010, Innsbruck, Austria. waldemar.gottardi@uibk.ac.at

Analytical and Bioanalytical Chemistry
|June 28, 2005
PubMed
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A novel redox-iodometry method precisely quantifies iodine/iodide solutions and related substances in minutes. This technique offers a simple, time-saving alternative to traditional iodometric titrations, especially for low concentrations.

Area of Science:

  • Analytical Chemistry
  • Electrochemistry

Background:

  • Traditional iodometric titration methods for quantifying iodine/iodide solutions are often laborious and expensive.
  • Existing colorimetric procedures can be outbalanced at low analyte concentrations.

Purpose of the Study:

  • To introduce a new, rapid, and precise iodometric method for quantifying aqueous solutions.
  • To establish a simple and cost-effective alternative to conventional analytical techniques.

Main Methods:

  • Utilizes redox potential measurements after reaction with a known concentration of iodide or iodine.
  • Employs simple instrumentation: a pH/mV meter with platinum and reference electrodes.
  • Relies on developed algorithms and GWBASIC programs for calibration and calculations.

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Main Results:

  • Achieves analysis times of 2-3 minutes.
  • Demonstrates a feasible concentration range from 0.1 mol/L down to 10⁻⁸ mol/L for specific oxidants.
  • Exhibits low calculated imprecision (0.4-0.9%) and inaccuracy (0.3-0.8%), with total error of 0.5-1.2%.

Conclusions:

  • Redox-iodometry is a simple, precise, and time-saving analytical method.
  • This technique is particularly advantageous for analyzing low concentrations of substances.
  • It serves as a practical and superior substitute for traditional iodometric titration and colorimetric methods.