09128 IUPAC Gold Book - amperometry 10.1351/goldbook.09128 09128 current 1 Electrochemical measurement principle based on measurement of current at a controlled applied potential. The current is usually faradaic and the applied potential is usually constant. Amperometry can be distinguished from voltammetry by the parameter being controlled (electrode potential \(E\)) and the parameter being measured (electrode current \(I\) which is usually a function of time - see chronoamperometry). In a non-stirred solution, a diffusion-limited current is usually measured, which is proportional to the concentration of an electroactive analyte. The integral of current with time is the electric charge, which may be related to the amount of substance reacted by Faraday’s laws of electrolysis. Faraday’s laws of electrolysis https://goldbook.iupac.org/terms/view/09075 chronoamperometry https://goldbook.iupac.org/terms/view/09129 voltammetry https://goldbook.iupac.org/terms/view/09148 PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 669 (https://doi.org/10.1515/pac-2018-0109) https://goldbook.iupac.org/terms/view/09128/html https://goldbook.iupac.org/terms/view/09128/json https://goldbook.iupac.org/terms/view/09128/plain Citation: 'amperometry' 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.09128 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. 2026-06-29T13:26:17+00:00