10210 IUPAC Gold Book - Craig countercurrent distribution apparatus 10.1351/goldbook.10210 10210 current 1 Apparatus for extraction based on a multistage countercurrent distribution. The Craig CCD apparatus consists of a battery of glass vessels designed to allow the mixing, settling, and transfer of extracted phase (sample) and the addition of fresh solvent (extractant) in a repetitive fashion. Movement about the horizontal axis provides gentle mixing of the phases, settling, and decanting of the upper phase. The extraction process is slow but is fully automated. multistage countercurrent distribution https://goldbook.iupac.org//terms/view/10217 PAC, 2016, 88, 517. 'Glossary of terms used in extraction (IUPAC Recommendations 2016)' on page 534 (https://doi.org/10.1515/pac-2015-0903) https://goldbook.iupac.org/terms/view/10210/html https://goldbook.iupac.org/terms/view/10210/json https://goldbook.iupac.org/terms/view/10210/plain Citation: 'Craig countercurrent distribution apparatus' 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.10210 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. 2026-08-04T19:14:50+00:00