GRAVIMETRIC DETERMINATION OF SULPHATE IN SOME SELECTED INDUSTRIAL EFFLUENTS. FUDMA JOURNAL OF SCIENCES, [S. l.], v. 4, n. 4, p. 290–294, 2021. DOI: 10.33003/fjs-2020-0404-484. Disponível em: http://162.254.38.185/index.php/fjs/article/view/484. Acesso em: 17 sep. 2025.