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Development of a More Sensitive and Specific Chromogenic Agar Medium for the Detection of Vibrio parahaemolyticus and Other Vibrio Species
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THE VIOLOGEN INDICATORS.

L Michaelis1, E S Hill

  • 1Laboratories of The Rockefeller Institute for Medical Research.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

This study tabulates normal potentials for viologen indicators at 30°C, crucial for determining oxidation-reduction potentials in solutions. These potentials are independent of pH, offering a stable reference for electrochemical measurements.

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Area of Science:

  • Electrochemistry
  • Chemical Thermodynamics

Background:

  • Viologens are widely used redox indicators.
  • Accurate normal potentials are essential for quantitative redox titrations and electrochemical studies.

Purpose of the Study:

  • To tabulate the normal potentials of various viologen indicators at 30°C.
  • To provide a method for calculating oxidation-reduction potentials based on indicator coloration.

Main Methods:

  • Measurement of normal potentials for methyl, ethyl, betaine, and benzyl viologens at 30°C.
  • Referencing potentials to the normal hydrogen electrode with an estimated accuracy of +/-0.002 V.

Main Results:

  • Normal potentials were determined: Methyl viologen (-0.446 V), Ethyl viologen (-0.449 V), Betaine viologen (-0.444 V), Benzyl viologen (-0.359 V).
  • An equation was presented to calculate the oxidation-reduction potential (E) of a solution based on indicator coloration (A%) and normal potential (E(o)).

Conclusions:

  • The determined normal potentials provide a reliable reference for viologen indicators.
  • The established relationship between coloration and potential is independent of pH, simplifying redox potential determination.