Study of the spatiotemporal variation of iron and manganese ions content in the Oued Moulouya water (North-East of Morocco)Ben Cheikh Boumediene, Yahya Khoukhi, Abdelhafid Chafi and Mourad ArabiE3S Web Conf., 364 (2023) 02002DOI: https://doi.org/10.1051/e3sconf/202336402002