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Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Stohner, Jürgen


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Volume 79, Issue 1

Issues

Guidelines for potentiometric measurements in suspensions Part B. Guidelines for practical pH measurements in soil suspensions (IUPAC Recommendations 2006)

Srecko F. Oman
  • Corresponding author
  • Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia
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/ M. Filomena Camões
  • Corresponding author
  • Departamento de Química e Bioquímica, University of Lisbon (CECUL/DQB), Faculdade de Sciências da Universidade de Lisboa, Edificio C8, Pt-1749-016, Lisboa, Portugal
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/ Kipton J. Powell
  • Corresponding author
  • Department of Chemistry, University of Canterbury, Christchurch, New Zealand
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/ Raj Rajagopalan
  • Corresponding author
  • Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, The Republic of Singapore
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/ Petra Spitzer
  • Corresponding author
  • Physikalisch-Technische Bundesanstalt (PTB), Postfach 3345, D-38023, Braunschweig, Germany
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Published Online: 2009-01-01 | DOI: https://doi.org/10.1351/pac200779010081

The measured cell potentials for suspension potentiometric cells have been interpreted and explained by a detailed analysis of the schemes for these cells ["Guidelines for potentiometric measurements in suspensions. Part A. The suspension effect (IUPAC Technical Report", Pure Appl. Chem.79, 67 (2007)]. Some former disagreements amongst investigations have been clarified. A new unambiguous operational definition of the suspension effect (SE) is presented. It is defined as the difference in cell potential for two suspension potentiometric cells, one with both electrodes in the separated equilibrium solution (eqs) and the other with both electrodes in the sediment or suspension. This potential difference is the sum of the change in the indicator electrode (IE) potential and the change in the liquid junction potential of the reference electrode (RE), when the electrodes are used for measurement, once in the sediment of the suspension and then in its eqs.

Keywords: anomalous liquid junction potential; boundary potential; IUPAC Analytical Chemistry Division; mixed potential; operational definition of suspension effect; pH; pIon; soil pH; suspension effect; suspension potentiometric cell

Project Year: 2004, Project Code: 2004-016-2-500

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About the article

Published Online: 2009-01-01

Published in Print: 2007-01-01


Citation Information: Pure and Applied Chemistry, Volume 79, Issue 1, Pages 81–86, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: https://doi.org/10.1351/pac200779010081.

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