An Overview onMetal Cations Extraction by Azocalixarenes. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 12, n. 1 & 2, p. 01–24, 2011. DOI: 10.21743/. Disponível em: http://pjaec.pk/index.php/pjaec/article/view/399. Acesso em: 12 jul. 2025.