04804 IUPAC Gold Book - preconcentration coefficient 10.1351/goldbook.P04804 P04804 current 1 This is defined as \[K = \frac{Q_{\rm{T}}/Q_{\rm{M}}}{Q_{\rm{T}}^{\rm{o}}/Q_{\rm{M}}^{\rm{o}}}\] where \(Q_{\rm{T}}\) and \(Q_{\rm{T}}^{\rm{o}}\) are the quantities of the microcomponent in the concentrate and in the sample, respectively (mass units or concentration units), and \(Q_{\rm{M}}^{\rm{o}}\) and \(Q_{\rm{M}}\) and are the quantities of the matrix before and after preconcentration, respectively. If the recovery is 100%, \(K=\frac{Q_{\rm{M}}^{\rm{o}}}{Q_{\rm{M}}}\). The terms enrichment coefficient and enrichment factor are not recommended. coefficient https://goldbook.iupac.org//terms/view/C01124 preconcentration https://goldbook.iupac.org//terms/view/P04803 recovery https://goldbook.iupac.org//terms/view/R05206 PAC, 1979, 51, 1195. 'Separation and Preconcentration of Trace Substances. I-Preconcentration for Inorganic Trace Analysis' on page 1198 (https://doi.org/10.1351/pac197951051195) https://goldbook.iupac.org/terms/view/P04804/html https://goldbook.iupac.org/terms/view/P04804/json https://goldbook.iupac.org/terms/view/P04804/plain Citation: 'preconcentration coefficient' 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.P04804 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. 2026-04-21T08:09:47+00:00