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Currently, different sources of contamination threaten water quality in Damietta, Egypt. The aim of this study was to assess the pollution, hydrogeochemistry and suitability for use in agriculture of water collected atseven stations along the Damietta branch of the Nile River. In addition to pH, temperature, dissolved oxygen (DO), and electrical conductivity (EC), levels of Mg2+, Ca2+, K+, Na+, Cl−, HCO3−, SO42− and CO32− were measured. From the highest to the lowest, the concentrations of cations were Na+ &amp;gt; Ca2+ &amp;gt; Mg2+ &amp;gt; K+, whereas those of anions were HCO3− &amp;gt; SO42− &amp;gt; Cl− in water samples collected at seven stations along the Damietta branch. Moreover, water quality indexes, such as sodium percentage (Na%) ranged between 21.6 and 71.4, Kelly's ratio from 0.37 to 3.85, sodium adsorption ratio (SAR) varied from 1.73 to 61.8, residual sodium carbonate (RSC) found to be in range of 0.2 to 3.8. Also, the potential salinity (PS) and permeability index (PI), magnesium hazard (MH), were calculated. Most samples (71%) belonged to the Mg–Ca–Na–HCO3 watertype. Fertilization wastes were identified as the main contributors of alkaline earth metals, whereas ion exchange was the main source of alkali metals. This work also provides information on distinguishing geochemical behaviors and the pollution of water samples.

Effects of pollution on hydrogeochemistry and water quality of the Damietta branch (Nile River, Egypt)