CHIOMA, Okereke; EMMANUEL, Agomuo; PETER, Amadi. Accumulation and toxicological risk assessment of Cd, As, Pb, Hg, and Cu from topsoils of school playgrounds at Obio-Akpor LGA Rivers State Nigeria. International Journal of Scientific World, [S. l.], v. 5, n. 1, p. 38–46, 2017. DOI: 10.14419/ijsw.v5i1.6710. Disponível em: https://sciencepubco.com/index.php/IJSW/article/view/6710.. Acesso em: 9 apr. 2025.