Betel-nut Peel as an Adsorbent in the Removal of Cd, Cr and Pb from Aqueous Solutions. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 13, n. 2, p. 137 – 147, 2012. DOI: 10.21743/. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/377. Acesso em: 3 jul. 2025.