A new simple, rapid, inexpensive and nontoxic spectrophotometric method for the determination of Ceftazidime in the pure and local market formulation was proposed. The method is based on the coupling reaction between the diazotized drug and 4-tert-butylphenol (4-TBP) to produce a colored compound with a (λ max 500 nm). The optimal conditions for the factors affecting the formation of this compound were studied. Beer's law was obeyed and a linear calibration curve was obtained over the range of (1-10 μg/mL) with a correlation coefficient (r=0.9890), molar absorptivity (ε=6.62710 3 L/mol.cm), the limit of detection 0.314 μg/mL, and the limit of quantification LOQ 1.047 μg/mL. the accuracy and precision of the method were checked and the method was applied successfully for the determination of Ceftazidime in commercial preparation and the values of recovery percent and RSD% ranged between (93.11 -102.20%) and (0.48 -9.54%) respectively.

Benzidines and phenols are the most priority pollutants. Separation and quantitative estimation of priority pollutant benzidines composed of various benzidines BZ, including substituted 3, 3'-dichlorobenzidine DCB and 3, 3'-dimethylbenzidine DMB, and priority pollutant phenols (9 compounds, i.e., phenol, 2-and 4-nitrophenol, 2,4-dimethylphenol, 2-, 2,4-di-, 2,4,6-tri-, Penta-chlorophenol, and 4-chloro-3-methylphenol)was performed using high performance liquid chromatography-ultra violet techniques. Both groups were separated using a C-18 column with a UV detector at a wavelength of 280 nm, and the flow of the mobile phase was isocratic. The mobile phase consisted of 75:25 methanol: water. The column temperature was 50°C, and the flow rate was 1.8 ml/min for the Benzedine's separation. The mobile phase consisted of a 50:50 acetonitrile: phosphate buffer. The optimum pH was 7.1, the flow rate was 0.7 ml/min and the optimum column temperature was 45°C for the phenols separation. The separation parameters were calculated, including the chromatographic parameters such as the capacity factor (k), the number of theoretical plates (N) , the selectivity factor (α), and the resolution factors (Rs).This method was applied to real samples. The water samples that were analyzed were obtained from a petroleum refinery wastewater treatment unit. The results ranged between undetectable levels and 246.9μg/L of the selected benzidines.The results were ranged between undetectable levels and 1865.61 μg/L of the selected phenols.

Syntheses, Characterization and biological Activity of a new ligand [4-[(1E)ethylideneamino]-5-phenyl-4H-1,2,4-triazole-3-thiol with some transition metals complexes

In present work, new tetra-dentate ligand, titled 3,5-bis ((E)-5-Bromo-2-hydroxy benzylidene amino) benzoic acid (H 3 L), was prepared via an acid-catalyzed condensation process. New four metallic ligand complexes with Co(II), Ni(II), Cu(II) and Zn(II) ions, were also prepared from the refluxing of equivalent moles. Ligand's structure and its complexes; were confirmed by numerous characterization methods, including Ultraviolet-Visible, Infrared, Mass Spectrometer, 1 H and 13 C Nuclear Magnetic Resonance spectra, atomic absorption, magnetic moments, and molar conductivity measurements. The results of the spectroscopic analyzes proved that the prepared ligand acts as tetradentate bi-ionic ligand and it was bonded to the metal ions by two nitrogen atoms of the two azomethine groups and by two oxygen atoms of the two phenolic hydroxyl groups after losing their two protons. Octahedral structure proposed to all prepared complexes. The (anti-bacterial) and (anti-fungal) activities of these compound were screened against (E. coli, S. aureus, Klebsiella spp., S. epidermidis,), and (Candida albicans). The results indicated that these compounds have moderated inhibition behavior. The activity of the prepared compounds against Acetyl Choline Esterase Enzyme (AChE) have also studied and the obtained data indicated the presence of different inhibition behavior.