Electrochemical measurement principle based on measurement of current at a controlled applied potential.
Notes: - 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.
Source:
PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 669 (https://doi.org/10.1515/pac-2018-0109)