Impact of anthropogenic and natural processes on the degradation of water and sediment quality of the Mghohga River estuary (northern Morocco)

Document Type : Primary Research paper



The Tangier city knew in the last decades an increasing production of household and industrial waste caused problems critical pollution. The objectives, in this study, were to understand the monitoring of water and sediment quality in Tangier area based on the comparison of hydrochemical data variations and land use changes during the urbanization, to distinguish the impact of natural processes and anthropogenic activities on the water and sediment quality. Six metallic trace elements were investigated at 5 water and sediment sites during 2010 and 2012. Concentrations of selected metals were measured using an atomic absorption spectrophotometer (AAS). The results obtained show that the level of the station where the discharged wastewater discharges from the Tangier city, there has been a significant change in the values ​​of the principal elements (Cr and Cd). Indeed, the metal content of the sediments of the Mghogha estuary of these elements reach particularly high values ​​at three levels: in the vicinity of discharges upstream and downstream of the Mghogha estuary respectively characterized by a strong industrial activity and a rejection of domestic wastewater. Significant correlations (p<0.05) between Cr-Cd were observed in sediment and Pb-Fe in water.