Al-Nahrain Journal of Science

New metal complexes of cu(II);Ni(II);Co(II);Mn(II);Zn(II);VO(IV) and Cd(II) have been synthesized from the Sciff base (L)derived from 4-amino antipyrine,salicyaldehyde andO-phenylene diamine. The prepared complexes where characterized by magnetic susceptibility,Molar conductance,FTIR,Uv-vis. The data show that these complexes have composition of ML type. The uv-vis,magnetic susceptibility data of the complexas suggest asquare-planar geometry around the central metal ion except VO(IV )complex which has square-pyramidal geometry

In this study,a boiling mixture of acids (20% HCl + 80%HNO3) was used to extract trace metalsfrom sediments for Mahaweel River(branch ofEuphrates). The elements of interest included Na, Mg, Ca, Cr, Cu, Pb, Hg and Ni, all of which can be determined by electro thermal atomic absorption spectrometry(ETAAS).High recoveriespercentage 96, 97, 99, 99, 97.5 and 95 for Na, Mg,Ca, Cr, Cu, and Pb, respectively. The relative standard deviation of the method is less than 3%.Calibration graphs for Pb, Ni and Cr were found to be linear between 100-250, 80-180, 180-250 ng/mL, respectively However, when the acid extraction method was applied to some selected sediments, the resulting trace metal concentrations, although reproducible. Apparently SRM-1645 provided too favorable an assessment of the true accuracy of the method with ordinary sediments

Reverse Phase High Performance Liquid Chromatography (RP-HPLC) was coupled with ultraviolet absorption sepectoscopy (UV) for separation and identification of Naphthalene, Acenaphthylene, Pyrene, Benz{a} anthracene and 1,3,2,4-Dibenzanthracene.RP-HPLC was performed on an ODS-C18 column (150×4.6 mm I.D) using acetonitrile–buffer phosphate as mobile phase. UV absorption spectra of the elutes was detected in 254 nm, and studying the chromatographic variables include organic modifier ratio, PH, column temperature and concentration of buffer to maximize resolution and minimize separation time. the results showed that using mobile phase( 80:20)v/v acetonitrile:0.01M phosphate buffer solution at PH 6 with flow rate 1ml/min and column temperature 60 C° at wave length 254 nm would give ideal separation with good resolution. Theseparation time was (7.5) min

The photochemistry of Tris(ethylxanthato) iron(III)was studied in five organic solvents: dimethyl sulfoxide (DMSO), methanol, acetone, ethyl acetate and Benzene .Monochromatic light of wavelength 365 nmwas used for theirradiation process at 25 oC. Uv-visible spectral changes and other observations indicatedan intra oxidation-reduction reaction occuring during the photolysis of Fe(etx)3complex, with homolytic scission of FeS bond. The quantum yield(d), rate of photodecomption and reactivity ratio (k2/k-1) were determined in each solvent. These values always increase as the polarity of the solvent increased and following the order.DMSO > Methanol > Acetone > Ethyl acetate > Benzene According to theexperimental results obtained, the mechanism of photodecomption of these complexes under the applied conditions was proposed

Cr(III), Co(II), Ni(II), and Cu(II) complexes of (1-benzoyl-3-methyl-1H-pyrazol-5(4H)-one have been synthesized and characterized by elemental analysis, FT-IR, UV/ visible spectra, magnetic susceptibility and molar conductivity. All complexes are expected to have an octahedral structure

The aim of this research is to study the emission and dispersion of pollutants (HC, CO, NOx, SPM) from the elevated flares in three situations of South Gas Company for Liquefied Petroleum Gas (LPG) production in Al-Basrah Governorate in Iraq. These three situations are Khor Al-Zubair plant, North Al-Rumaila Plant, and Storage Complex. The number of flares in the situations are5, 3, and 2 flares respectively.A mathematical model formulated in a computer program written in visual basic language was utilized in finding the ground level concentrations of pollutants HC, CO, NOx, and SPM emitted from the elevated flares of the three situations; the concentrations were found at selected sites inside and outside of each situation at different distances. The programmed model takes into consideration all the meteorological conditions (wind speed, wind direction, ambient temperature, and atmospheric stability) which may take place atthe study region. The emission rates of the pollutants which are emitted from the elevated flares are found depending on the laboratory analysis of gas compositions send to the flares , also by utilizing the modern EPA methods for determination the emission rates.The results of research illustrate the meteorological cases which are more effect in causing the maximum groundlevel concentrations of pollutants especially the unstable atmospheric conditions and wind speed.On the other hand, the programmed model is utilized to find the concentrations of hydrocarbons (HC), propane (C3H8) , and butane (C4H10) which are released from flare column to the atmosphere in case of combustion failure of these gases, at areas adjacent to the situations of flares

Two types of novolac were prepared, namely / random (o,p-) and (o.o-) novolac. The prepared resins were modified by three methods, the first one includes esterification of phenolic hydroxyl groups in the prepared resins via their treatment with adipoyl chloride and urethane derivative by the reaction of toluene diisocyanate with resins . While the second modificationincludes incorporation of phosphorous, silicon, and boron into the novolac structure via reaction of P2O5SiCl2(CH3)2,SiCl2(C6H5)2and Ba(OH)2with novolac, Sulfure was incorporated into the novolac structure by preparation of 3,3,5,5 tetra methylo1-4,4-dihydroxy diphenyl sulfone which then reacted with o,o-novolac and the third modification includes reaction of benzyl chloride with sodium salt of novolac and structure contains benzylic ether were obtained.All prepared products were characterized by IR. HNMR, thermal analysis and some physical properties

D.c. σ(0) and a.c conductivity σ(w) and dielectric parameter (and tan60Te30Ge10glassy thin films which were prepared by thermal evaporation were investigated. Measurementsof a.c. conductivity over frequency range (100Hz-100kHz) and temperature range (303-363K) showed that the a.c. conductivity follows the empirical formula a.c(w)=Aws, where (s) lies between(1.03-0.60).In the glasses of Se60Te30Ge10thin films the d.c. conductivity along localized states prevails. A.c conductivity is explained by hopping mechanism of charge transfer between two defect centers

The imaging system we haveinvestigating suffer from the appearance of scattered bright points. A usual solution to reduce this noise can be achieved by an increase in exposure but it is very difficult to prevent the hits. In present study, we have investigating algorithms to reduce noise with out an increase in exposure by adopting four digital filters for noise reduction and comparing between efficiency of each filter to determine an efficient method. The resulting images and fidelity criteria showed that the median filter smoothes hit noise while maintaining edge information, but the mean filter image is a blurred version of the noisy image