Optimization And Validation Of Analytical Methods For Trace Metal Analysis In Heavy Crude Oils By Flame Atomic Absorption Spectrophotometry. International Journal of Environmental Sciences, [S. l.], v. 11, n. 6s, p. 795–808, 2025. DOI: 10.64252/dsjcde83. Disponível em: http://theaspd.com/index.php/ijes/article/view/1213.. Acesso em: 12 oct. 2025.