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Abstract
In Egypt, Rosetta branch, one of the two main branches of the Nile River, is impacted by several agricultural drains and industrial companies at Kafr El-Zayat City which potentially affect and deteriorate its quality of water. In this study water and sediment samples were collected from fifteen different locations in Kafr-El Zyat area. Analytical values including temperature, pH, total concentrations of trace metals, major anions and cations were inserted into the Visual MINTEQ geochemical speciation model to calculate various ionic activities of (Mn, Fe, Cu and Al).
The results show that the studied metal in the collected samples are controlled by different solid phases. Mn activity is controlled by MnCO3(s), Cu is controlled by CuO(s) while Fe is controlled by Fe(OH)3 and Al is controlled by Al(OH)3 amorphous and gibssite. The study reveals that, identifying ionic activities is of particular importance as pollutants affect the water environment by the chemical behavior of the ionic species than by total concentrations. Finally the adverse effects of highly soluble metals are important in water chemistry because their inherent toxicities are related to the bioavailability.
Key words: Ion activities, Heavy metals, Speciation, River Nile, Geochemical modelling