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

2nd Colombian Congress of Electrochemistry; 2nd Symposium on Nanoscience and Nanotechnology

物理学;化学

Suarez, H.^1 ; Cristancho, R.^1 ; Peralta, F.^1 ; Torres, H.^1

Instituto Nacional de Metrología, Bogotá D.C., Colombia^1

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

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/786/1/012041/pdf
DOI  :  10.1088/1742-6596/786/1/012041

来源: IOP

【 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.