Toward Unified pH of Saline Solutions
Fluctuations of pH in coastal systems are generally surveyed through potentiometric pH measurements. A new concept of a unified pH scale was introduced with the great advantage of enabling comparability of absolute values, pHabs, pertaining to any medium. Using water as an anchor solvent, yielding p...
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ftmdpi:oai:mdpi.com:/2073-4441/13/18/2522/ 2023-08-20T04:09:00+02:00 Toward Unified pH of Saline Solutions Silvie Lainela Ivo Leito Agnes Heering Gaëlle Capitaine Bárbara Anes Filomena Camões Daniela Stoica agris 2021-09-15 application/pdf https://doi.org/10.3390/w13182522 EN eng Multidisciplinary Digital Publishing Institute Oceans and Coastal Zones https://dx.doi.org/10.3390/w13182522 https://creativecommons.org/licenses/by/4.0/ Water; Volume 13; Issue 18; Pages: 2522 acidity seawater pH scales unified scale absolute pH differential potentiometric measurements minimization of liquid junction potential ionic liquid salt bridges residual liquid junction potential Text 2021 ftmdpi https://doi.org/10.3390/w13182522 2023-08-01T02:42:05Z Fluctuations of pH in coastal systems are generally surveyed through potentiometric pH measurements. A new concept of a unified pH scale was introduced with the great advantage of enabling comparability of absolute values, pHabs, pertaining to any medium. Using water as an anchor solvent, yielding pHabsH2O, enables referencing the pHabs values to the conventional aqueous pH scale. The current work aims at contributing to implement pHabsH2O to saline solutions. To this purpose, differential potentiometric measurements, with a salt bridge of ionic liquid [N2225][NTf2], were carried out aiming at overcoming problems related to residual liquid junction potentials that affect the quality of such measurements. The ability to measure pHabsH2O with acceptable uncertainty was evaluated using Tris-Tris·HCl standard buffer solutions prepared in a background matrix close to the characteristics of estuarine systems (salinity of 20) as well as with NaCl solutions with ionic strength between 0.005 and 0.8 mol kg−1. The present study shows that for high ionic strength solutions, such as seawater, challenges remain when addressing the assessment and quantification of ocean acidification in relation to climate change. Improvements are envisaged from the eventual selection of a more adequate ionic liquid. Text Ocean acidification MDPI Open Access Publishing Water 13 18 2522 |
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MDPI Open Access Publishing |
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English |
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acidity seawater pH scales unified scale absolute pH differential potentiometric measurements minimization of liquid junction potential ionic liquid salt bridges residual liquid junction potential |
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acidity seawater pH scales unified scale absolute pH differential potentiometric measurements minimization of liquid junction potential ionic liquid salt bridges residual liquid junction potential Silvie Lainela Ivo Leito Agnes Heering Gaëlle Capitaine Bárbara Anes Filomena Camões Daniela Stoica Toward Unified pH of Saline Solutions |
topic_facet |
acidity seawater pH scales unified scale absolute pH differential potentiometric measurements minimization of liquid junction potential ionic liquid salt bridges residual liquid junction potential |
description |
Fluctuations of pH in coastal systems are generally surveyed through potentiometric pH measurements. A new concept of a unified pH scale was introduced with the great advantage of enabling comparability of absolute values, pHabs, pertaining to any medium. Using water as an anchor solvent, yielding pHabsH2O, enables referencing the pHabs values to the conventional aqueous pH scale. The current work aims at contributing to implement pHabsH2O to saline solutions. To this purpose, differential potentiometric measurements, with a salt bridge of ionic liquid [N2225][NTf2], were carried out aiming at overcoming problems related to residual liquid junction potentials that affect the quality of such measurements. The ability to measure pHabsH2O with acceptable uncertainty was evaluated using Tris-Tris·HCl standard buffer solutions prepared in a background matrix close to the characteristics of estuarine systems (salinity of 20) as well as with NaCl solutions with ionic strength between 0.005 and 0.8 mol kg−1. The present study shows that for high ionic strength solutions, such as seawater, challenges remain when addressing the assessment and quantification of ocean acidification in relation to climate change. Improvements are envisaged from the eventual selection of a more adequate ionic liquid. |
format |
Text |
author |
Silvie Lainela Ivo Leito Agnes Heering Gaëlle Capitaine Bárbara Anes Filomena Camões Daniela Stoica |
author_facet |
Silvie Lainela Ivo Leito Agnes Heering Gaëlle Capitaine Bárbara Anes Filomena Camões Daniela Stoica |
author_sort |
Silvie Lainela |
title |
Toward Unified pH of Saline Solutions |
title_short |
Toward Unified pH of Saline Solutions |
title_full |
Toward Unified pH of Saline Solutions |
title_fullStr |
Toward Unified pH of Saline Solutions |
title_full_unstemmed |
Toward Unified pH of Saline Solutions |
title_sort |
toward unified ph of saline solutions |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/w13182522 |
op_coverage |
agris |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Water; Volume 13; Issue 18; Pages: 2522 |
op_relation |
Oceans and Coastal Zones https://dx.doi.org/10.3390/w13182522 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/w13182522 |
container_title |
Water |
container_volume |
13 |
container_issue |
18 |
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2522 |
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1774721634105556992 |