Characterization of Humic Acid from the River Bottom Sediments of Burigonga: Complexation Studies of Metals with Humic Acid. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 11, n. 1, p. 42–52, 2010. DOI: 10.21743/. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/428. Acesso em: 22 nov. 2025.