Abstract

CHAMBI TAPIA, Maria Isabel et al. Validation of the x-ray fluorescence (FRX-ED) analytical method for the determination of metals in soils at Colquencha municipality. Rev. Bol. Quim [online]. 2019, vol.36, n.3, pp.139-147. ISSN 0250-5460.

Abstract The analytical method by the technique of X-ray Fluorescence with dispersive energy (FRX-ED) for the determination of the concentrations of Cu, Fe, Mn, Ni and Zn, has been validated with statistical tools in soil samples extracted from calicate soils of the Colquencha municipality. The FRX-ED technique does not require prior treatment in the preparation of standards, reference materials or soil samples, which are analyzed in the form of tablets. The quantification of the Cu, Fe, Mn, Ni and Zn metals is determined through the QXAS software and contrasted with the SOIL-7 certified reference material and the MAPEP-7 intercomparison material. Validated parameters for Cu, Fe, Mn, Ni and Zn compared to SOIL-7 and Ni and Zn compared to MAPEP-7 that include detection limit (LOD) and quantification (LOQ) are within the acceptance criteria. Reproducibility and repeatability have error values that are below 5% for Cu, Mn and Zn, while Fe showed values below 1%. The accuracy evaluated with the student t (one tail) does not present a significant difference for Cu, Mn and Zn, excepting Fe. The results obtained by FRX-ED showed us that the concentrations of the metals Cu, Fe, Mn and Zn in the soils are within the maximum permissible limits, according to the data reported in international studies, having established this, that the soils of the municipality of Colquencha are suitable for cultivation.

Keywords : X-R Fluorescence; Heavy metals; Agricultural soils; ISO 17025.

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