Term: pre-equilibrium https://doi.org/10.1351/goldbook.P04809 Definition: Preliminary treatment of a solvent in order to convert the extractants into a suitable chemical form. Notes: 0) The use of @E02175@ in this sense is confusing and should be avoided. 1) The term conditioning may be used as a synonym for pre-@E02175@. Source: Citation: 'pre-equilibrium' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.P04809 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.