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Guidelines for Potentiometric Measurements in Suspensions

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Chemistry International -- Newsmagazine for IUPAC
From the journal Chemistry International -- Newsmagazine for IUPAC Volume 27 Issue 4

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Guidelines for Potentiometric Measurements in Suspensions

This project aims to unambiguously define and interpret the suspension effect (SE) on the basis of recent experiments. It will take into account the enormous amount of theoretical and experimental work accomplished in 75 years since the term was first introduced—a period in which no consensus was achieved. On the basis of the recommended definition and interpretation, the significance of potentiometric measurements in suspensions performed in different ways will be explained.

The SE is defined as the difference of the galvanic cell voltage measured with the electrodes (i) in the equilibrium solution of the suspension and (ii) in its sediment. It will be argued that the SE should be regarded as the sum of two effects that occur when the electrodes are immersed in a suspension. These are (i) the transition of the indicator electrode from a reversible potential to an irreversible mixed potential, and (ii) a systematic error of measurement caused by the outflow of the solution from the reference electrode salt bridge into the suspension.

Due to the irreversible mixed potential of the indicator electrode, which cannot be eliminated in suspension measurements, no thermodynamically exact data can be obtained. Guidelines will be presented for modifications of potentiometric methods applied to suspensions and the significance of these measurements will be interpreted and illustrated.

For more information and comments, contact the Task Group Chairman S.F. Oman <irena.lipar@uni-lj.si>.

www.iupac.org/projects/2004/2004-016-2-500.html

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Page last modified 6 June 2005.

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Published Online: 2009-09-01
Published in Print: 2005-07

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https://doi.org/10.1515/ci.2005.27.4.31

Articles in the same Issue

  1. Masthead
  2. From the Editor
  3. Contents
  4. Assessing the IUPAC
  5. The International Chemistry Olympiad
  6. Public Images of Chemistry
  7. IUPAC History Preserved
  8. Freedom to Publish
  9. InChl 1.0 Release
  10. Samsung Funds IUPAC Programs for Young Chemists
  11. 2005 IUPAC Prize for Young Chemists
  12. Honoring A Hero
  13. IUPAC Elections
  14. Wolfram vs. Tungsten
  15. Reply from Ture Damhus
  16. Remediation Technologies for the Removal of Arsenic from Water and Wastewater
  17. Global Availability of Information on Agrochemicals
  18. Towards a Holistic Mechanistic Model for Reversible Addition Fragmentation Chain Transfer (RAFT) Polymerizations
  19. Guidelines for Potentiometric Measurements in Suspensions
  20. Design of Polymer Education Materials for French-Speaking Countries
  21. Provisional Recommendations
  22. High-Temperature Mass Spectrometry: Instrumental Techniques, Ionization Cross- Sections, Pressure Measurements, and Thermodynamic Data (IUPAC Technical Report)
  23. Chemical Speciation of Environmentally Significant Heavy Metals with Inorganic Ligands. Part 1: The Hg2+ - Cl-, OH-, CO32-, SO42-, and PO43- Aqueous Systems (IUPAC Technical Report)
  24. Crop Protection Chemistry in Latin America
  25. Biotechnology
  26. Chemical Sciences in Changing Times: Visions, Challenges, and Solutions
  27. XI International IUPAC Symposium on Mycotoxins and Phycotoxins
  28. Metallothionein
  29. Chemistry for Agriculture
  30. Pesticide Chemistry
  31. Analytical Sciences
  32. Chemical Education
  33. Coordination Chemistry
  34. High Temperature Materials
  35. Mark Your Calendar
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