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Monatshefte für Chemie / Chemical Monthly

, Volume 135, Issue 12, pp 1475–1488 | Cite as

Comparison of Several Calibration Procedures for Glass Electrodes in Proton Concentration

  • Isabel Brandariz
  • José L. Barriada
  • Teresa Vilariño
  • Manuel E. Sastre de Vicente
Article

Summary.

Several reported procedures for calibrating glass electrodes in proton concentration are compared. Some recommendations for non-experts are also given. The examined procedures can be classified into two broad categories, namely: those based on direct potential difference measurements of solutions of known proton concentration and those that use one or several pH standards to calibrate the electrode and subsequently measure the pH of solutions containing known proton concentrations. With a single buffer, the two types of procedures lead to equivalent results. However, if two pH buffers are used, the slope of the calibration graph in proton concentration will differ from the real electrode slope to an extent proportional to the difference between the liquid junction potentials of the two buffers. Therefore, any other method is preferable under these circumstances.

Keywords. Glass electrode; Proton concentration; Electrode response; Potentiometry; Calibration. 

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Copyright information

© Springer-Verlag/Wien 2004

Authors and Affiliations

  • Isabel Brandariz
    • 1
  • José L. Barriada
    • 1
  • Teresa Vilariño
    • 1
  • Manuel E. Sastre de Vicente
    • 1
  1. 1.Departamento de Química Física e Ingeniería Química I, Facultad de CienciasCampus da Zapateira, Universidad de La CoruñaLa CoruñaSpain

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