Implementation of coulometric titration system at constant current for developing of certified materials as primary standards

[摘要] 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 0.1mol/kg reference materials. In addition, it also shows preliminary studies for future development of potassium chloride (KCl) and ethylenediaminetetraacetic acid disodium salt (EDTA-Na2) certification.

[发布机构] Instituto Nacional de Metrología, Bogotá D.C., Colombia^1

[效力级别] 化学

[关键词] Colombia;Constant current;Coulometric titration;Disodium salt;High purity;National metrology institutes;Primary standards;Reference material