Validation of X-Ray Fluorescence Spectrometer Technique to Determine Heavy Metal Concentrations in Soil Samples. Global Journal of Science Frontier Research, [S. l.], v. 22, n. H5, p. 43–48, 2022. DOI: 10.34257/GJSFRHVOL22IS5PG43. Disponível em: https://testing.journalofscience.org/index.php/GJSFR/article/view/102506. Acesso em: 4 feb. 2026.