The spatiotemporal variation in lead and zinc contents in the Moulouya River (northeastern Morocco)Boumediene Ben Cheikh, Yahya Khoukhi, Mourad Arabi, Abdelhafid Chafi, Abdelouadoud Omari and Said BenyoussefE3S Web Conf., 527 (2024) 02006DOI: https://doi.org/10.1051/e3sconf/202452702006