Electrochemical measurement principle in which the electric charge required to carry out a known electrochemical reaction is measured. By
Faraday’s laws of electrolysis, the amount of substance is proportional to the charge.
Notes: - Coulometry used to measure the amount of substance is a primary reference measurement procedure not requiring calibration with a standard for a quantity of the same kind (i.e. amount of substance).
- The coulometric experiment can be carried out at controlled (constant) potential (see direct coulometry at controlled potential) or controlled (constant) current (see direct coulometry at controlled current).
Source:
PAC, 2020, 92, 641. 'Terminology of Electrochemical Methods of Analysis (IUPAC Recommendations 2019)' on page 683 (https://doi.org/10.1515/pac-2018-0109)