Evaluation of Diazatetraoxa Cryptand as Extractant for Transition Metals and Pb2+. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 15, n. 2, p. 20–25, 2014. DOI: 10.21743/. Disponível em: http://pjaec.pk/index.php/pjaec/article/view/332. Acesso em: 12 jul. 2025.