Comparative Study of Groundwater Pollution of M’nasra and Sfafaa zones (Gharb, Morocco) by NitratesNajib El Khodrani, Serine Omrania, Abdrrahim Nouayti, Abdelmajid Zouahri, Ahmed Douaik, Hamza Iaaich, Mbark Lahmar and Mohammed FekhaouiE3S Web Conf., 150 (2020) 01006DOI: https://doi.org/10.1051/e3sconf/202015001006