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Article

Symmetric Potentiometric Cells for the Measurement of Unified pH Values

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Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
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Institute of Chemistry, University of Tartu (UT), 14a Ravila Street, 50411 Tartu, Estonia
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Laboratoire National de Métrologie et d’Essais (LNE), 1 Rue Gaston Boissier, 75015 Paris, France
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FCiências. ID (FC.ID), Centro de Química Estrutural, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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Government Office of the Capital City Budapest (BFKH), Németvölgyi út 37-39, 1124 Budapest, Hungary
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Instituto Português da Qualidade (IPQ), R. António Gião, 2, 2829-513 Caparica, Portugal
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The Scientific and Technological Research Council of Turkey–National Metrology Institute (TUBITAK UME), Gebze Campus, Gebze 41470, Turkey
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Czech Metrology Institute (CMI), Okružní 31, 63800 Brno, Czech Republic
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Slovak University of Technology, Faculty of Mechanical Engineering, Namestie Slobody 17, SK-81231 Bratislava 1, Slovakia
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DFM A/S, Kogle Allé 5, 2970 Hørsholm, Denmark
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Institut für Anorganische und Analytische Chemie, University of Freiburg, Albertstr. 21, 79104 Freiburg, Germany
*
Authors to whom correspondence should be addressed.
Symmetry 2020, 12(7), 1150; https://doi.org/10.3390/sym12071150
Received: 29 May 2020 / Revised: 30 June 2020 / Accepted: 2 July 2020 / Published: 9 July 2020
(This article belongs to the Special Issue Symmetry in Acid-Base Chemistry)
A unified pH scale of absolute values (pHabs scale) enables the comparison of acidities in different solvents. To date, very few different experimental setups have been used for the measurement of values on this scale. The article describes the design and performance of the different symmetric cells used for unified pH measurement by several institutions. Well-established and reliable standard aqueous buffer solutions are the first step of method validation necessary to achieve a robust metrological level for more complex media. The pH of aqueous standard buffers was measured by differential potentiometry, where the potential between two glass electrodes is measured directly. All the tested electrochemical cells prove to be suitable for unified pH measurements. This validation highlights that the method is, to a large extent, independent of the used equipment, including the cell geometry. The inherent symmetry of the cell design helps to reduce the experimental workload and improve the accuracy of obtained results. View Full-Text
Keywords: unified pH scale; pHabs; all solvents; differential potentiometry; liquid junction; ionic liquid unified pH scale; pHabs; all solvents; differential potentiometry; liquid junction; ionic liquid
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MDPI and ACS Style

Heering, A.; Stoica, D.; Camões, F.; Anes, B.; Nagy, D.; Nagyné Szilágyi, Z.; Quendera, R.; Ribeiro, L.; Bastkowski, F.; Born, R.; Nerut, J.; Saame, J.; Lainela, S.; Liv, L.; Uysal, E.; Roziková, M.; Vičarová, M.; Snedden, A.; Deleebeeck, L.; Radtke, V.; Krossing, I.; Leito, I. Symmetric Potentiometric Cells for the Measurement of Unified pH Values. Symmetry 2020, 12, 1150. https://doi.org/10.3390/sym12071150

AMA Style

Heering A, Stoica D, Camões F, Anes B, Nagy D, Nagyné Szilágyi Z, Quendera R, Ribeiro L, Bastkowski F, Born R, Nerut J, Saame J, Lainela S, Liv L, Uysal E, Roziková M, Vičarová M, Snedden A, Deleebeeck L, Radtke V, Krossing I, Leito I. Symmetric Potentiometric Cells for the Measurement of Unified pH Values. Symmetry. 2020; 12(7):1150. https://doi.org/10.3390/sym12071150

Chicago/Turabian Style

Heering, Agnes, Daniela Stoica, Filomena Camões, Bárbara Anes, Dániel Nagy, Zsófia Nagyné Szilágyi, Raquel Quendera, Luís Ribeiro, Frank Bastkowski, Rasmus Born, Jaak Nerut, Jaan Saame, Silvie Lainela, Lokman Liv, Emrah Uysal, Matilda Roziková, Martina Vičarová, Alan Snedden, Lisa Deleebeeck, Valentin Radtke, Ingo Krossing, and Ivo Leito. 2020. "Symmetric Potentiometric Cells for the Measurement of Unified pH Values" Symmetry 12, no. 7: 1150. https://doi.org/10.3390/sym12071150

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