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Electrolytic conductivity: a reference system for aqueous solutions.

E Ferrara1, F Durbiano, P P Capra

  • 1Istituto Elettrotecnico Nazionale Galileo Ferraris, Strada delle Cacce, 91, I-10135 Torino, Italy. ferrara@ien.it

Annali Di Chimica
|September 14, 2001
PubMed
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A new system for measuring electrolytic conductivity in aqueous solutions was developed for SI traceability. This system achieves a relative uncertainty of 0.6% for 0.1 molal KCl solutions across a 20-35°C range.

Area of Science:

  • Electrochemistry
  • Metrology
  • Physical Chemistry

Background:

  • Accurate measurement of electrolytic conductivity is crucial for various scientific and industrial applications.
  • Traceability to the International System of Units (SI) is essential for reliable and comparable results.
  • Existing methods may lack sufficient accuracy or direct SI traceability.

Purpose of the Study:

  • To develop and validate a novel system for measuring electrolytic conductivity in aqueous solutions.
  • To ensure traceability of conductivity measurements to the SI.
  • To accurately determine the geometrical constant of the conductivity cell.

Main Methods:

  • Development of a specialized conductivity cell with a removable central section for precise geometrical constant determination.

Related Experiment Videos

  • Preparation and analysis of 0.1 molal potassium chloride (KCl) samples.
  • Measurements conducted over a temperature range of 20°C to 35°C.

    • Main Results:

    • The developed system provides accurate electrolytic conductivity measurements.
    • Relative uncertainty was assessed to be at the level of 0.6%.
    • Results show satisfactory agreement with reference values from existing literature.

    Conclusions:

    • The established system successfully enables SI-traceable measurements of electrolytic conductivity.
    • The system demonstrates high accuracy and reliability for standard solutions like KCl.
    • This work contributes to improved metrological standards in electrochemistry.