Heavy metal concentration of surface water of Martil’s watershed leading into the Moroccan Western Mediterranean

Pollution of superficial waters is one of the most answered aspects in the world and especially in the Mediterranean. The Mediterranean countries like Morocco is settled in a serious policy for the conservation of resources in superficial waters or groundwater, reducing the rate of the pollution load reaching the different streams and also, practicing techniques of cleanup especially in the Mediterranean watersheds whose the watershed of Martil which represents the largest one in the north western of Morocco. The results of physicochemical parameters recorded at different stations, show a high pollution load in stations located in the center of urban and industrial areas, translated by high rates of TSS, COD and BOD5 and consequently low levels of dissolved O2. The analysis of heavy metals, have led to the remarkable presence, by location, of iron, aluminum and lead, by cons, the results showed low contents of zinc, copper and cadmium.