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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F21%3AN0000054" target="_blank" >RIV/00177016:_____/21:N0000054 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/1424-8220/21/11/3935" target="_blank" >https://www.mdpi.com/1424-8220/21/11/3935</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/s21113935" target="_blank" >10.3390/s21113935</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 ((s)pH, solvent-specific scales). The recent introduction of the unified pH (pH(abs)) concept opens up the possibility of measuring pH, expressed as pH(abs)(H2O), 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 pH(abs)(H2O) values in mixtures of methanol, ethanol, and acetonitrile, with water, but without the presence of buffers or other additives. The aim was to assigned pH(abs)(H2O) values to solvent-water mixtures using differential potentiometry and the 'pH(abs)-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 pH(abs)(H2O) values for selected compositions of solvent-water mixtures are presented.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 ((s)pH, solvent-specific scales). The recent introduction of the unified pH (pH(abs)) concept opens up the possibility of measuring pH, expressed as pH(abs)(H2O), 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 pH(abs)(H2O) values in mixtures of methanol, ethanol, and acetonitrile, with water, but without the presence of buffers or other additives. The aim was to assigned pH(abs)(H2O) values to solvent-water mixtures using differential potentiometry and the 'pH(abs)-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 pH(abs)(H2O) values for selected compositions of solvent-water mixtures are presented.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/8B18003" target="_blank" >8B18003: Realisation of unified pH Scale</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Sensors

ISSN

1424-8220

e-ISSN

1424-8220

Svazek periodika

21

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

16

Strana od-do

—

Kód UT WoS článku

000660662600001

EID výsledku v databázi Scopus

2-s2.0-85107281800