IGBERASE, Ephraim. Retraction Note: The adsorption of Pb2+ and Ni2+ ions utilizing modified chitosan beads: A response surface methodology and artificial neural network modelling study. EQA - International Journal of Environmental Quality, [S. l.], v. 65, p. 97, 2025. DOI: 10.6092/issn.2281-4485/20311. Disponível em: https://eqa.unibo.it/article/view/20311. Acesso em: 31 oct. 2024.