Inland saline lakes of Wadi El Natrun depression, Egypt

Abstract

Abstract. The morphology and geochemistry of saline lakes in the Wadi E1Natrun depression were studied. All lakes had pH values of 8.5-9.5 and a salinity from 283 to 540 g/L. The main ionic components were sulphate, chloride, carbonate and sodium. Traces of magnesium were also present. The water of the lakes is of the C1-to SO 2--C1-type. Increased C1-in Wadi E1 Natrun brines can increase metal solubility due to the formation of soluble chloro-complexes of trace elements. The metal concentrations decrease in the order: Pb > Cu > Cd > Ni > Zn > Fe > Mn. The characteristics of Wadi E1 Natrun saline lakes are compared with those from other saline lakes.

Dethiobacter alkaliphilus gen. nov. sp. nov., and Desulfurivibrio alkaliphilus gen. nov. sp. nov.: two novel representatives of reductive sulfur cycle from soda lakes

“…8-12 samples from individual lakes in each region were combined into a single pool. The pH of the brines varied from 9.2 to 10.6, total salt concentration from 20 to 400 g l -1 and total soluble alkalinity from 0.05 to 2 M. More information about the sites can be found in Sorokin et al (2004a);Taher (1999) and Duckworth et al (1996).…”

Alkaline protease from a new halotolerant alkaliphilic Bacillus agaradhaerens strain ak-r isolated from egyptian soda lakes

“…This valley is an elongated depression approximately 90 km northwest of Cairo (Egypt) that extends in a northwest by southeast direction between latitudes 30°15' north and longitude 30°30' east. The bottom of Wadi ElNatrun valley is 23 m and 38 m below sea level and water level of Rosetta branch of the Nile, respectively, with average length and width of 60 km and 10 km, respectively (TAHER, 1999). The collected samples were kept at 4 °C, and transferred within few days to the laboratory at King Saud University (Riyadh, Saudi Arabia).…”

Salt Minerals at Wadi El Natrun Saline Lakes, Egypt. New Implications From Remote Sensing Data

“…[1][2][3][4] A comparative mineralogical study of saline deposits in the study area was carried out by. 5 Mass developments of sulfide-oxidizing phototrophic bacteria in the upper sediments and in the waters of Wadi El Natrun lakes have been observed.…”