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Related Experiment Videos

Improved reliability of pH measurements.

Petra Spitzer1, Barbara Werner

  • 1Physikalisch Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany. petra.spitzer@ptb.de

Analytical and Bioanalytical Chemistry
|November 16, 2002
PubMed
Summary

New international guidelines ensure reliable pH measurements through traceability to global standards. This enhances the comparability and acceptance of analytical data worldwide.

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Area of Science:

  • Analytical Chemistry
  • Metrology

Background:

  • Accurate pH measurements are crucial for laboratory and industrial quality control.
  • Traceability of measurement results is essential for international acceptance of analytical data.
  • Current methods require recognized references for calibrating pH meter-electrode assemblies.

Purpose of the Study:

  • To introduce the new International Union of Pure and Applied Chemistry (IUPAC) recommendation for pH measurement.
  • To enable traceability of measured pH values to a globally recognized conventional reference frame.
  • To report on international initiatives aimed at improving pH measurement consistency.

Main Methods:

  • Description of the primary method for pH measurement.
  • Utilizing standard buffer solutions traceable to recognized references for calibration.
  • Conducting key comparisons for pH through the Consultative Committee for Amount of Substance (CCQM).

Main Results:

  • The new IUPAC recommendation provides a framework for traceable pH measurements.
  • The first key comparison for pH (CCQM-K9) assessed the equivalence of national measurement procedures.
  • International initiatives are underway to enhance the consistency of pH measurement results.

Conclusions:

  • The established traceability ensures the reliability and comparability of pH measurements globally.
  • Demonstrating the equivalence of national traceability structures is vital for international data acceptance.
  • These efforts collectively improve the consistency and reliability of pH measurements in science and industry.

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