?Removal of Iron and Manganese from Under- ground Water Using Cement Dust. Biological Sciences - PJSIR, [S. l.], v. 39, n. 1-4, p. 81–82, 1996. Disponível em: http://www.v2.pjsir.org/index.php/biological-sciences/article/view/2379. Acesso em: 30 apr. 2026.