RESUMO
Seasonal variation of some heavy metals [Fe, MN, Cu, Cd, Pb, Co, Ni, Cr, Sn and Al] are estimated at surface and bottom waters from 10 stations at near-shore, Alexandria coast during 2004. Salinity [16.20-39.10] and pH values [alkaline side] were also measured. The concentrations of heavy metals are at high levels in regions receiving different effluents from wastes of El-Mex region. A comparative study between the different stations was carried out to evaluate the effect of sewage, agricultural and industrial wastes discharged into some regions of Alexandria coast. Different statistical treatments were carried out to calculate the correlation coefficients between metals and the annual average variation
Assuntos
Água do Mar/análise , Estações do AnoRESUMO
Seasonal collection of water samples were carried out at Alexandria coast from 18 selected stations during 2004 - 2005. The study area was divided into three sections A, B, and C. The study areas A and C are clearly affected by brackish polluted water discharge from El-Ammia, Rakta, Bughas, Umum, and Noubaria drains which were studied too. The hydrographic parameters [pH, DO, salinity, and OOM] were studied. This work aimed at evaluating some major ions level [average of 434.6 mg/l, 1.39 g/l, 3.11g/l, and 67.32 mg/l for Ca, Mg, SO[4], and Br in surface water and 449.12 mg/l, 1.48g/l, 3.42 g/l, and 75.68 mg/l in bottom water, respectively] in Alexandria coastal water and their chlorinity ratios relevant to the corresponding normal oceanic ones. The influence of dilution effect resulted from the discharge of different types and amount of land-based effluents was discussed. By all, the average chlorinity ratios of cations deviations from the respective oceanic values can detect as a resulting from the discharging of land -based effluents; [average of 0.074, 0.023, 0.004, and 0.172 for Mg/CI, Ca/CI, Br/CI and SO[4]/CI, respectively]. The correlation coefficients between the major cations and the hydrographic parameters were computed and discussed