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۱IR Spectroscopic Investigation, X–Ray Structural Characterization, Thermal Analysis Decomposition and Metal Content of Sediment Samples along Egyptian Mediterranean Coast
اطلاعات انتشار: World Applied Sciences Journal، بيست و سوم،شماره۶، ۲۰۱۳، سال
تعداد صفحات: ۱۴
Spectral characteristics of 10 samples along the Egyptian Mediterranean coast from Abu Qir Bay to Marsa Matrouh have been discussed and the conclusions are drawn. The combined spectroscopic techniques are used to throw light on the nature of the sediment. Infrared spectroscopy (IR) has been successfully used in the analysis of sedimentary minerals. Many common minerals exhibit unique absorbance spectra in the mid–IR range, which extends from 400 to 4000 cm . The bulk mineralogy of samples 1 from the IR and X ray diffraction studies revealed that calcite, aragonite and quartz are the dominant minerals. Thermal curves (TGA\DTA) are used to evaluate and discuss different kinetic parameters (n, Ea, G , H S , k, Z, Tm and m). The negative and small values of entropy suggest a great degree of organization before the final step for sediment degradation. The small collision factor values (Z), support the view of the extra stability of these sediments; this is well verified by small free energy values. Since activation energy (Ea) can be thought of as the energy barrier, so the minimum energy required starting the sediment decomposition in study area is high with a range of 282.244 to 412.848 Kjmol 1. Carbonates, Calcium, Magnesium and silicate values fluctuated in the range of 5.42–81.2%, 2.17–40.6%, 1.57– 8.37% and 15.98–94.58 % for carbonate Calcium, Magnesium and silicate. Sodium, Potassium, Iron and Aluminum recorded values fluctuated in the ranges of (1.6–4.63%, 0.225–1.79% 046–3.543% and 0.045–0.974) for Na, K, Fe and Al, respectively. Mn, Zn, Cu, Pb, Cd,V, Se, Sn and As in sediment of the study area were varied in the ranges of 23 – 479.60, 26.34– 246.27, 9.75–190.15, 2.2 112.1, 0.314–6.76, 8.93–70.64, 0.3–1.89, 6.96–437.4 and 1.54–11.04 ìg\g respectively.Pollution indicators (MPI, mCd and PLI) are used to assess status of sediments pollution with heavy metals. The data revealed that Eastern harbor and 2; Western harbor 1and 2; El Max 2 are the most polluted stations with heavy metals.
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