Environmental, physical, and chemical changes of Lake Nubia-Aswan High Dam Lake water
Awadallah, R.M.; Soltan, M.E.
Journal of Environmental Science and Health Part A Environmental Science and Engineering and Toxic and Hazardous Substance Control 30(9): 2071-2087
1995
DOI: 10.1080/10934529509376322
Accession: 002612596
During the period from 23 November to 18 December 1992 water samples were collected from the surface and at 25, 50, 65 and 80% depth between Daal Cataract in Sudan and the High Dam wall in the most southern part of Egypt. The study concerned with measuring the velocity of water movement, temperature, electrical conductivity and pH, and with the determination of dissolved oxygen. CO-3-2-, HCO-3-, SO-4-2-, NO-2-, PO-4-3-, Cl-, siO-2, Na, Ca, Mg, total hardness (TH) and total dissolved solids (TDS), in the entire body of water, in order to follow up the distribution of physical components between surface and bottom water of the High Dam Lake and their effects on the water quality and on the life of biota (growth of the microorganisms communities, fish,turtles, birds, .etc.) The study showed temperature ranges from 16.5-21.8 degree C conductivity; 17.1-25.3 mSm-1, dissolved oxygen; 7.2-10.8 mg/L, pH; 7.20-8.25, 0.0-12.0 mg/L, HCO-3-; 103.7-146.4 mg/L, 0.0-0.18mg/L, Cl-; 1.77-6.21 mg/L, Na; 1.84-31.17mg/L, Ca; 19.2428.86 mg/L, Mg; 3.39- 13.62 mg/L, TH; 71.98-112 mg/L, SiO-2; 1.25-15 mg/L and TDS; 120-157 mg/L. The statistical analysis of the database exhibited positive and significant correlation coefficient values. On the basis of the results there was a stratification in the watermasses of the lake. This is consistent with the data obtained. Positive and lower correlations indicate anticorrelations, i.e. adsorption of Ca-2+ and Mg-2+ on CO-3-2-, HCO-3- and NO-2- on silicates.