Physico-chemical characteristics and heavy metal contents in water of Wadi El-Rayan Lakes, western desert, Egypt.

Abstract

hysico-chemical characteristics and eight heavy metals (Fe, Mn, Cu, Co, Cr, Ni, Pb and Cd) of Wadi El Rayan Lakes water were evaluated from summer 2009 to spring 2010. Salinity (TDS) and major ions show highly significant difference between the two lakes. On the other side, station 1 in 1 st lake (infront El Wadi Drain) exhibits the highest content of nutrient salts and heavy metals.The mean values of Fe, Mn, Cu, Co, Cr, Ni, Pb and Cd in the 1 st lake were 562. 33, 82.71, 15.49, 9.69, 11.86, 11.68, 9.66 and <0.20µg/l respectively, on the other hand, the values were 372. 00, 56.70, 10.37, 7.72, 9.72, 9.43, 6.79 and <0.20µg/l in the 2 nd lake respectively. The present results revealed that the 2 nd lake undergoes progressive increase in salinity, especially in the last decade and the lake water may be salinized with time, leading to a great revolutionize in fauna, flora and environment of these lakes. On the other hand, the discharge of pollutants via El Wadi Drain causes unfavorable impact on the lakes environment.

Seasonal Variations in Primary Productivity and Its Relation to Some Physico-Chemical Properties of Water at Al-Abbassa Fish Farm

“…On the other hand, the lowest temperature value (17.5°C ±1.40) was observed at site (A) during winter. Low water temperature during winter is due to high current velocity, frequent clouds and high humidity (Shama et al, 2011). This in agreement with Khalil et al (2012) who found that water temperature was 17.78ºC at Ismailia canal water during winter season.…”

Assessment of Heavy Metal Contamination in Surface Water of Burullus Lagoon, Egypt

“…It is the most abundant element of the heavy metals in most Lagoons. This is agreed with the findings of Shama et al (2011). The highest value of iron (48.6 μg/l) was recorded at Damru drain, while the lowest value (10.55 μg/l) was obtained at west of Abou Amer area far from drainage areas.…”

Impact of pollution on macroinvertebrates biodiversity in Ismailia Canal, Egypt

“…Regarding seasonal variation, summer exhibited the highest water temperature with an average of 31.6 ºC, while winter exhibited the lowest with an average of 17.78 ºC. The low water temperature during winter and autumn is due to frequent clouds, high humidity, high current velocity, while high water temperature during summer and spring is due to clear atmosphere and great solar radiation (Shama et al, 2011). The analysis of variance (ANOVA) revealed significant regional and seasonal variation (F= 10.99 and 467.457, p< 0.05, respectively).…”

“…Nitrite was detected only during winter with lower values than the corresponding values of nitrate due to the fast conversion of NO 2 -to NO 3 -ions by nitrifying bacteria (Shama et al, 2011). The increase in NO 2 -during cold seasons might be attributed to low consumption by phytoplankton as well as the oxidation of ammonia by nitrifying bacteria and biological nitrification (Rabeh, 2000 and (Table 8).…”