Resumo

AHUMADA-FONGUA, Diego A.; SOTO-MORALES, Luis L.; MORALES-ERAZO, Laura V.  e  ABELLA-GAMBA, Johanna P.. Development of a certified reference material for elemental analysis of drinking wáter. Rev.Colomb.Quim. [online]. 2019, vol.48, n.3, pp.36-44. ISSN 0120-2804.  https://doi.org/10.15446/rev.colomb.quim.v48n3.78660.

The production of reference materials (RM) is a process that involves carrying out different studies related to the preparation, packaging and chemical stability of the analytes. This paper presents the results of the development of a drinking water RM. The packaging is done by applying two procedures (conventional packaging and immersion). The characterization of this material was carried out through atomic absorption, ICPMS and ion chromatography. The assessment of the homogeneity of the material was carried out for Na, Mg, Ca, Fe, K, Co, Pb, Mo, As, Ni, Se, Cu, Al, Cr Zn and anions as NO3 - y Cl-. The stability studies were evaluated in the short term (accelerated conditions), and long term by ICPMS and IC, and gravimetric monitoring was also performed. Homogeneity and stability were evaluated based on their uncertainty. The uncertainty associated with homogeneity and MR stability evidenced acceptable results for most analytes. The results of the gravimetric monitoring allowed to detect losses of mass of the material, reason why a new scheme was proposed to evaluate the stability through gravimetric methods. Finally, it was found that the RM presents expanded uncertainties between 0,93% and 4,38%, which makes it suitable for the intended use.

Palavras-chave : measurement uncertainty; reference materials; metrological traceability.

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