scholarly journals Unified pH Measurements of Ethanol, Methanol, and Acetonitrile, and Their Mixtures with Water

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3935
Author(s):  
Lisa Deleebeeck ◽  
Alan Snedden ◽  
Dániel Nagy ◽  
Zsófia Szilágyi Nagyné ◽  
Matilda Roziková ◽  
...  
Keyword(s):  
Salt Bridge ◽  
Ph Measurements ◽  
Organic Mixtures ◽  
Solvent Water ◽  
Ph Values ◽  
Liquid Salt ◽  
Practical Standpoint ◽  
Glass Electrodes ◽  
Selection Of ◽  
Measuring Ph

Measurement of pH in aqueous-organic mixtures with different compositions is of high importance in science and technology, but it is, at the same time, challenging both from a conceptual and practical standpoint. A big part of the difficulty comes from the fundamental incomparability of conventional pH values between solvents (spH, solvent-specific scales). The recent introduction of the unified pH (pHabs) concept opens up the possibility of measuring pH, expressed as pHabsH2O, in a way that is comparable between solvent, and, thereby, removing the conceptual problem. However, practical issues remain. This work presents the experience of the authors with measuring pHabsH2O values in mixtures of methanol, ethanol, and acetonitrile, with water, but without the presence of buffers or other additives. The aim was to assigned pHabsH2O values to solvent–water mixtures using differential potentiometry and the ‘pHabs-ladder’ method. Measurements were made of the potential difference between glass electrodes immersed in different solutions, separated by an ionic liquid salt bridge. Data were acquired for a series of solutions of varying solvent content. This work includes experiences related to: a selection of commercial electrodes, purity of starting material, and comparability between laboratories. Ranges of pHabsH2O values for selected compositions of solvent–water mixtures are presented.

scholarly journals Current Stage and Perspectives of pH Measurements by Use of Ionic Liquid Salt Bridge

2016 ◽  
Vol 65 (4) ◽  
pp. 181-191 ◽  
Author(s):  
Takashi KAKIUCHI ◽  
Masahiro YAMAMOTO
Keyword(s):  
Ionic Liquid ◽  
Salt Bridge ◽  
Ph Measurements ◽  
Liquid Salt ◽  
Current Stage

scholarly journals Symmetric Potentiometric Cells for the Measurement of Unified pH Values

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1150 ◽  
Author(s):  
Agnes Heering ◽  
Daniela Stoica ◽  
Filomena Camões ◽  
Bárbara Anes ◽  
Dániel Nagy ◽  
...  
Keyword(s):  
Electrochemical Cells ◽  
Cell Design ◽  
Cell Geometry ◽  
Ph Measurements ◽  
Buffer Solutions ◽  
Ph Values ◽  
Glass Electrodes ◽  
Ph Scale ◽  
And Performance ◽  
Aqueous Standard

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.

scholarly journals The pH measurement with glass electrode in an electromagnetic field

2016 ◽  
Vol 81 (12) ◽  
pp. 1407-1414 ◽  
Author(s):  
Dragan Veselinovic ◽  
Zoran Velikic
Keyword(s):  
Electromagnetic Field ◽  
Buffer Capacity ◽  
Extreme Values ◽  
Ph Value ◽  
Radiation Power ◽  
Glass Electrode ◽  
Frequency Interval ◽  
Buffer Solutions ◽  
Ph Values ◽  
Glass Electrodes

Measurements of pH values of buffer solutions (pH 4.0, 7.0 and 10.0) and distilled water have been performed with a glass electrode in electromagnetic field at the frequency interval of 10 MHz to 200 MHz and the output power of dispersed and reflected electromagnetic radiation of 0.01 W to 3 W. In all the cases, there occurred a reduction of pH values, i.e. a "recorded pH value" was obtained. The reduction appears within the applied frequency interval reaching extreme values at specific frequencies. The reduction of the pH values increases with the radiation power and depend of the solution buffer capacity. The effect of electromagnetic field on pH value change is exerted dominantly through the influence on glass electrodes.

The Ideal Ionic Liquid Salt Bridge for Direct Determination of Gibbs Energies of Transfer of Single Ions, Part II: Evaluation of the Role of Ion Solvation and Ion Mobilities

2018 ◽  
Vol 130 (9) ◽  
pp. 2372-2376 ◽  
Author(s):  
Andreas Ermantraut ◽  
Valentin Radtke ◽  
Niklas Gebel ◽  
Daniel Himmel ◽  
Thorsten Koslowski ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Direct Determination ◽  
Salt Bridge ◽  
Ion Solvation ◽  
Gibbs Energies ◽  
Liquid Salt ◽  
Gibbs Energies Of Transfer ◽  
The Ideal

scholarly journals Application of a pH Electrode Incorporating an Ionic Liquid Salt Bridge to the Measurement of Rainwater Samples

2017 ◽  
Vol 33 (6) ◽  
pp. 739-742 ◽  
Author(s):  
Yota KUDO ◽  
Manabu SHIBATA ◽  
Satoshi NOMURA ◽  
Nobuaki OGAWA
Keyword(s):  
Ionic Liquid ◽  
Salt Bridge ◽  
Liquid Salt ◽  
Ph Electrode
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