Validación de un método de espectrofotometría de absorción atómica para la cuantificación de cobre en muestras solidas metalúrgicas

Abstract

CONDITION FOR PUBLICATION OF PROJECT. This study presents the validation of an analytical method based on atomic absorption spectrophotometry (AAS) for the quantification of copper in metallurgical solid samples, with the objective of establishing a reliable and reproducible procedure to satisfy the analytical needs of the industry. The research follows the SAE guidelines, evaluating key performance parameters such as limit of detection (LOD), limit of quantification (LOQ), linearity, precision, accuracy, robustness. The experimental design included the use of certified reference materials and interlaboratory comparisons with an accredited Conformity Assessment Body (OEC). The results showed an LOD of 0.0075ppm, a LOQ of 0.025ppm and a coefficient of determination R2 of 0.9980, indicating excellent linearity. The intermediate precision presented a %RSD of less than 2% at all concentration levels, while the recovery ranged between 80% and 120%, confirming the selectivity of the method. In addition, robustness against controlled variations of experimental conditions was checked. The interlaboratory comparison evidenced the agreement of the results obtained with the values reported by the OEC, consolidating the reliability and accuracy of the validated method as an efficient and economical analytical tool for the metallurgical industry. Keywords: validation, atomic absorption spectrophotometry, solid samples, copper quantification, metallurgical analysis