ENRICHMENT FACTOR OF ATMOSPHERIC TRACE METAL USING ZIRCONIUM TITANIUM IRON AND COPPER AS REFERENCE ELEMENT. Nigerian Journal of Technology, [S. l.], v. 35, n. 4, p. 785–795, 2016. DOI: 10.4314/njt.354.1170. Disponível em: https://www.nijotech.com/index.php/nijotech/article/view/1170. Acesso em: 27 apr. 2026.