D-C polarographic determination of ampicillin in pharmaceutical dosage forms. G.O. Analytical Letters, 27, 2516 . Spectrophotometric studies and analytical applications of the complexes of Fe(III), Ni(II) and Cu(II) with some 4-amino antipyrine azo derivatives. Spectroscopy Letters, 27, 981 . Application of alizarine derivatives as chromogenic reagents for the spectrophotometric determination of some sulfa drugs. Microchemical Journal, 51, 369. Utility of certain π-acceptors for the spectrophotometric determination of norfluxacin. Analyst, 120, 1189 . Polarographic determination of metronidazole in pharmaceutical formulations and urine. G.O. . icrochemical Journal, 55, 110 . Polarographic Investigation of Co(II), NI(II) and Zn(II) complexes with procaine. G.O. Analytical Letters, 30, 2279 . Colorimetric determination of ampicillin and 6-aminopenicillanic acid using acenaphthenequinone as a chromophoric reagent. analytical Letters, 30, 1337 . Colorimetric microdetermination of mercury (II) with some quinoxaline azo compounds in presence of an anionic surfactant. Monatsheft Fur Chemie, 132, 587 . Role of natural gas in improving air quality into greater Cairo. S.F. Bulletin of Faculty of Science "Cairo University", 75, 1 . Voltammetric behavior and determination of cinnarizine in pharmaceutical formulations and serum, G.O. Analytical Letters, 41, 3021 . Adsorptive Voltammetric Determination of Nimesulide at Glassy Carbon Electrode. G.O. EL-SAYED, S.A. Adsorptive Voltammetric Determination of Chlordiazepoxide in pure and dosage forms, G. O. J. Chem. Pharm. Res., 1 (1): 225-232 Determination of Secnidazole in Tablets and Human Serum by Cathodic Adsorptive Stripping Voltammetry. Template polymerization synthesis of hydrogel and silica composite for sorption of some rare earth elements. Maize Stalks as a Cheap Biosorbent for Removal of Fe (II) from Aqueous Solution