Assessment of the Environmental Impact of Fly Ash on the Concentration of  Heavy Metals around Cement Company of Northern Nigeria. Lafia Journal of Scientific and Industrial Research, [S. l.], v. 3, n. 1, p. 7–12, 2024. DOI: 10.62050/ljsir2025.v3n1.370. Disponível em: https://lafiascijournals.org.ng/index.php/ljsir/article/view/370.. Acesso em: 7 jan. 2026.