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Coulometry is a primary method for measuring high purity substances. This is used to certify the primary reference materials required in a chemical analysis process. This paper describes the coulometric titration system developed by the National Metrology Institute (NMI) of Colombia for the certification of hydrochloric acid 0,1 mol·kg. In addition, it also shows preliminary studies for future development of and ethylenediaminetetraacetic acid disodium salt (EDTA-Na2) certification.

Implementation of Coulometric Titration System at Constant Current for Certification of Primary Reference Materials