Some trace metals in the waters of Abu Qir bay

Abu Qir Bay is subjected to many sources of pollution; industrial, agricultural and domestic. These sources affect greatly the quality of the seawater. The opening of Rashid Nile Branch discharges annually about 3.3x109 m[3] of fresh water in the bay. The waste water discharge through El-Tabia pump Station amounts to 1.5-2.0 million m[3]/day the annual average concentration of lead, zinc and cadmium the period of study were 9.92, 53.32 and 1.55 mg/l respectively. The western side of the bay was affected by the brackish water entering the bay from idku and Rashid mouth for pb and station4 had the maximum value [14.04 and 2.79 micro g/1, respectively during the period of investigation. For Zn Station 23 had the maximum value during the four seasons of invertigation[109. 11 micro g/l]

Chemical forms of copper and zinc in the surficial sediments of Brollos Lake, Egypt

Lake Borollos is situated in the northern part of Nile Delta along the Mediterranean coast of Egypt between longitudes 30 degree 31-and 31 degree 10 E and latitudes 31 degree 21-and 31degree sign 35-N. this wprk revealed that more than 72% of the total copper occurred in the residual fraction. The carbonate-Cu organic- Cu and oxides fractions ranged from 1.8 to 6.7%, 1.4 to 14.7% and 0.53to 12.4%, respectively. The exchangeable Cu was found in trace amounts and the other fractions were relatively low in comparison with zinc fractions. The residual fraction of zinc reached between 66 and 88%. The carbonate Zn, organic Zn and oxides fractions ranged from 1.3 to 7.9, 2.8 to 11.6% and 2.8 to 13.2%, respetively. There was no pollution by Cu and Zn metals in contrast with the results previously reported for other polluted Egypt aquatic environments such as lake mariut

influence of land-based sources on the nutrients level in Abu-Qir bay

Surface and bottom water samples were collected bimonthly during the year 1990 at 23 localities covering Abou-Qir Bay area. The concentrations of P, N and Si showed great temporal as well as spatial variations. Significant positive correlation coefficients were found between most of nutrient salts and chlorophyll a, explaining the dependence of phytoplankton growth on these ions. The calculated inverse correlations between the nutrient contents and salinity, on the other hand, demonstrated the allochthonous origin of most of these salts. Phosphorus appears as the most important limiting factor where the N: P ratio average ranged between 24: 1 and 36: 1 at the off- and near-shore localities, respectively. Occasionally, nitrogen tends to be a controlling factor particularly during winter and autumn seasons, where the N: P ratio was found below 4.5: 1. The Si: P ratio varied widely from >100: 1, affected by different factors. The high ratios calculated for September samples collected at the near- shore localities may have resulted from autochthonous processes [regeneration from sediments for silicates] as well as from allochthonous contribution [drainage water]. The ratios were highly reduced during winter as a result of diatom uptake. Chlorophyll a biomass in Abou-Qir water was found in a considerable concentration [0 - 9.57 mg/m3] with an annual average of 1.15 mg/m3

Organic pollutants in Abu Qir Bay

Natural sea water contains many dissolved organic compounds in minute concentrations. Among them are: Detergents, phenolic compounds and urea. These compounds originate from life processes in the sea. Dissolved organic compounds are utilized by many, if not all, forms of marine life, in one way or another. The results revealed that the detergent concentrations are comparable with those recorded previously in the same area. For the concentrations of phenolic compounds in Abou-Qir Bay the results did not reach danger levels for aquatic life compared with those recorded previously in the Eastern Harbor and El- Max Bay. For urea content it is clear that the bay is affected by the wastes from the Abou-Qir Fertilizer Company

Un-ionized ammonia concentration in coastal waters of Alexandria, effect of pH, total ammonia and temperature

The concentration of un-ionized ammonia which is harmful to fish along Alexandria coastal water ranged between 0.15-0.92 U mol/L in El-Mt-x Bay and 0.23-3 U mol/L in the Eastern Harbour. El-Mex Bay has higher content of un-ionized ammonia than the Eastern Harbour due to a large amount of industrial and agricultural waste water discharged to the area [6 million m /day]. There is a strong negative correlation between un-ionized ammonia, total ammonia and pH values