16084 IUPAC Gold Book - sensory effect level 10.1351/goldbook.16084 16084 current 1 Intensity, where the detection threshold level is defined as the lower limit of the perceived intensity range (by convention, the lowest concentration that can be detected in \(\pu{50\%}\) of the cases in which it is present). Quality, where the recognition threshold level is defined as the lowest concentration at which the sensory effect can be recognized correctly in \(\pu{50\%}\) of the cases. Acceptability and annoyance, where the nuisance threshold level is defined as the concentration at which not more than a small proportion of the population, less than \(\pu{5\%}\), experiences annoyance for a small part of the time, less than \(\pu{2\%}\).Note: Since annoyance will be influenced by a number of factors, a nuisance threshold level cannot be set on the basis of concentration alone. threshold https://goldbook.iupac.org//terms/view/16136 PAC, 2007, 79, 1153. 'Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)' on page 1308 (https://doi.org/10.1351/pac200779071153) https://goldbook.iupac.org/terms/view/16084/html https://goldbook.iupac.org/terms/view/16084/json https://goldbook.iupac.org/terms/view/16084/plain Citation: 'sensory effect level' 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.16084 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. 2026-06-07T03:06:52+00:00