Investigation of drinking- and Nile-water samples of upper Egypt

Nile- and drinking-water samples which were collected from Aswan to Giza during January, June and August 1987, were investigated. The water temperature, transparency and pH were measured in situ and the samples were analysed for the following constituents, i.e. free CO 2 (0,00 to 7,04 mg/l), carbonate (0,0 to 2,0 mg/l), bicarbonate (120 to 160 mg/l), pH (7,00 to 8,45), nitrite (0,00 to 0,10 mg/l), nitrate (0,018 to 0,360 mg/l), phosphate (0,007 to 0,500 mg/l), Ca 2+ (24,05 to 36,90 mg/l), Mg 2+ (9,73 to 15,56 mg/l), total hardness (TH) (102 to 112 mg/l), chloride (6,5 to 11,7 mg/l), sulphate (3,5 to 15,5 mg/l), ion (0,00 to 0,11 mg/l), organic matter (0,8 to 5,2 mg/l) and total dissolved solids (125 to 230 mg/l. Ionic dominance patterns did not change within the seasons although Ca, Mg, HCO 3 − , Cl − and SO 4 2− in both Nile and drinking water increased from Aswan to Assiut and then decreased