14688 IUPAC Gold Book - final chronic value 10.1351/goldbook.14688 14688 current initialism: FCV 1 Estimate of the concentration of a substance corresponding to a cumulative probability of \(\pu{0.05}\) in the chronic toxicity values for all genera for which acceptable chronic tests have been conducted on the material. The FCV can also be calculated by dividing the final acute value (FAV) by the final acute-to-chronic toxicity ratio (ACR). acute-to-chronic toxicity ratio https://goldbook.iupac.org//terms/view/14422 final acute value https://goldbook.iupac.org//terms/view/14687 PAC, 2009, 81, 829. 'Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)' on page 886 (https://doi.org/10.1351/PAC-REC-08-07-09) https://goldbook.iupac.org/terms/view/14688/html https://goldbook.iupac.org/terms/view/14688/json https://goldbook.iupac.org/terms/view/14688/plain Citation: 'final chronic value' 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.14688 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. 2026-04-20T16:46:16+00:00