02299 IUPAC Gold Book - extractant 10.1351/goldbook.E02299 E02299 current synonym: extracting agent 1 The active component(s) primarily responsible for transfer of a solute from one phase to the other. The term extracting agent is a synonym but solvent and ligand should not be used in this context. Certain extractants that consist of liquids immiscible with water (e.g. tributyl phosphate or certain ketones) might comprise the only component of the initial organic phase but extractant(s) can also be dissolved in diluent. ketones https://goldbook.iupac.org//terms/view/K03386 Orange Book, 2nd ed., p. 91 (https://media.iupac.org/publications/analytical_compendium/) PAC, 1993, 65, 2373. 'Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)' on page 2380 (https://doi.org/10.1351/pac199365112373) https://goldbook.iupac.org/terms/view/E02299/html https://goldbook.iupac.org/terms/view/E02299/json https://goldbook.iupac.org/terms/view/E02299/plain Citation: 'extractant' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.E02299 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. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-07-25T21:46:29+00:00