الملخص

The current study is based on the use of statistical techniques to study and identify factors controlling the concentrations of dissolved major elements in Tigris River water within a wide range of the river course, starting from Fishkabur region in the north to Baghdad city in the south. The Results show that the rock compositions of the river basin mainly control the concentrations of the dissolved major ions in the river water with limited effect of anthropogenic factor, represented by human activities, that controls the nitrate ion concentration. The results also indicate the presence of spatial and temporal variations in the dissolved major ions concentrations, along the study area.