Distribution of different metals in coastal waters of Alexandria, Egypt

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

Electronic sepctral properties of substituted azouracil compounds

Synthesis of 5-[substituted phenylazo] uracil compounds [I] have been reported. The analytical data and 1H-NMR are used to elucidate the structures. The electronic spectral properties of the organic compounds were investigated in presence of different solvents and at different pH's. The pK's values were determined and related with the molecular structure of the compounds. The electronic transitions were assigned. The phenomenon of tautomerism was explained. The shifts in peak locations in the electronic spectra of the organic compounds have been correlated with different solvent polarity parameters. X = -H; 2-CH3;3CH3;3-OH; 2-COOH; 4-COOH; 2-Cl; 3-Cl; 4-Cl; 2-Br; 3-NO2 2,5-diCH3 2,5-diCI and 2,4-diCI

behaviour of P-Nitrobenzoresorcinol thermodynamic parameters of ionization and its complexing properties

The thermodynamic properties [pK, and delta G, delta H and delta [delta S] for the ionization of p-nitrabenzeneazaresarcinol were evaluated. The interaction between such ligand and Co, Ni and Cu was discussed. The data were found to follow the William-Irving order

Mixed ligand complexes of copper [II] -4-nitrobenzeneazoresorcinol complex with unidentate ligands

The formation constants of mixed ligand complexes of copper [II]-4-Nitrobenzeneazoresorcinol complex with unidentate ligands were determined by spectrophometric method at 25°C. The data of the inner sphere complex are related with both the electron donor and basicity constants of the unidentate ligands