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- Title
Rigorous pH measurement in non-aqueous solution: measurement method and reference values in ethanol.
- Authors
Bastkowski, Frank; Heering, Agnes; Uysal, Emrah; Liv, Lokman; Leito, Ivo; Quendera, Raquel; Ribeiro, Luís; Deleebeeck, Lisa; Snedden, Alan; Nagy, Dániel; Szilágyi, Zsófia Nagyné; Camões, Filomena; Anes, Bárbara; Roziková, Matilda; Stoica, Daniela
- Abstract
The recently introduced unified pH ( pH abs H 2 O ) concept enables rigorous pH measurements in non-aqueous and mixed media while at the same time maintaining comparability to the conventional aqueous pH scale. However, its practical application is hindered by a shortage of reference pH abs H 2 O values. In order to improve this situation, the European Metrology Research Project (EMPIR) UnipHied ("Realisation of a UnipHied pH scale") launched an interlaboratory comparison among highly experienced electrochemistry expert laboratories to assign the first such reference pH abs H 2 O values by adopting an extensive statistical treatment of the reported measurement data: to phosphate buffer in water–ethanol mixture (50 wt% of ethanol) and ammonium formate buffer in pure ethanol. Two different measurement setups — one capable of being easily adopted in industrial applications — have been used to demonstrate the robustness of pH abs H 2 O measurement. This is an important step towards wider adoption of the pH abs H 2 O concept in practice, like liquid chromatography, biofuels analysis and electrocatalysis.
- Subjects
REFERENCE values; ETHANOL; LIQUID chromatography; GLASS electrodes; ELECTROCATALYSIS; BIOMASS energy
- Publication
Analytical & Bioanalytical Chemistry, 2024, Vol 416, Issue 2, p461
- ISSN
1618-2642
- Publication type
Article
- DOI
10.1007/s00216-023-05043-5