Work

The “pH-window” of a representative deep eutectic solvent and evaluation of electrodes for pH measurement

Year: 2025

Type: article

Abstract: The Brønsted acid–base properties of ethaline, composed of choline chloride and ethylene glycol, were investigated as a representative deep eutectic solvent (DES). Rigorous potentiometric titrations with a hydrogen electrode were performed for the first time in DES to determine the autoprotolysis constant and the p K a values of some weak acids. These results revealed a ~ 4 unit shift in pH relative to water and established the pH window of the DES, which allows direct conversion of the pH value between the DES and conventional solvents. IS-FET and glass electrodes were also evaluated, confirming practical applicability.

Source: Chemical Physics Letters

DOI: 10.1016/j.cplett.2025.142475

Authors: Ryo Kanzaki, Tomoya Hidaka, Shinji Tajima, Hitoshi Kodamatani, Takashi Tomiyasu

Institution: Kagoshima University

Language: English

Topic: Ionic liquids properties and applications

Subfield: Catalysis

Field: Chemical Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,270

Funder: Japan Society for the Promotion of Science