Validación de métodos analíticos para la determinación de Hg, Na, Cr, Cd, y As por absorción atómica en las matrices de agua residual, natural y de consumo humano.

Abstract

Abstract:The validation of analytical methods for the determination of Hg, Na, Cr, Cd, and As by atomic absorption in the matrices of wastewater, natural and for human consumption, was carried out under standardized methodologies such as Standard Methods and Eurachem, and fulfilling the norm NTE INE9N-ISO / IEC 17025. The air-acetylene (Na), cold vapor (Hg), electrothermal (Cr, Cd, As) flame methods were used with the Perkin 400 Atomic Absorption Spectrophotometer. To determine the validation, 15 readings of each matrix (natural, residual and human consumption) were made, enrichments were made with certified reference substances and recoveries of each matrix for the assurance of the quality of the method. Control charts were made and by means of different statistical analyzes (limit of detection and quantification, repeatability, reproducibility, accuracy, uncertainty, linearity, range of work) the effectiveness of the method was corroborated.