Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 5 )

2019 ( 594 )

2018 ( 712 )

2017 ( 712 )

Custom range...

Search Results: 1 - 10 of 402594 matches for " Mahmood M. BARBOOTI "
All listed articles are free for downloading (OA Articles)
Page 1 /402594
Display every page Item
Evaluation of Analytical Procedures in the Determination of Trace Metals in Heavy Crude Oils by Flame Atomic Absorption Spectrophotometry  [PDF]
Mahmood M. Barbooti
American Journal of Analytical Chemistry (AJAC) , 2015, DOI: 10.4236/ajac.2015.64031
Abstract: In the present work, four trace metals, V, Ni, Cu and Fe, have been determined in five crude oil samples of Eastern Baghdad area, Iraq by flame atomic absorption spectrophotometry. The crude oils are characterized with API gravity values in the range, 25 - 15. The V/Ni ratios for the studied crudes were in the range 3.7 to 5.4 and indicated a typical of the sapropelic-type organic matter. The Ni and V contents were correlated with API gravity where an increase of metal contents with the decrease in the API values could be observed. The plots of V and Ni versus sulfur indicated linear correlation. This is attributed to the increase of porphyrinic structures of the metals. The method of direct dilution (DD) with organic solvent and the standard addition (SA) were evaluated as compared with standard dry ashing-acid dissolution (DA). In most cases the DD method gave V and Ni concentrations that are higher than DA and for the heavier crude oil (API = 15) the DD results were significantly smaller than those of the DA method. The SA method can be a good solution to determine the trace metals in heavy crude oils provided that the addition must not exceed the levels of the metal concentration in the diluted samples.
Simultaneous Removal of Chromium and Lead from Water by Sorption on Iraqi Montmorillonite  [PDF]
Mahmood M. Barbooti
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.63024
Abstract: A certified clay mineral from Iraq, montmorillonite, is used for the adsorption of chromium and lead ions from water. Experimental design is utilized here to plan for the practical work and analysis of the results. Batch wise experiments are carried out to equilibrate Cr and Pb solutions (250 mg/L) individually and simultaneously with montmorillonite (5 - 20 g/L) at various pH ranges (2 - 7.5) for 10 - 60 minutes. The results indicate perfect fit with the model used. Chromium adsorption is sensitive to pH changes being high at neutral medium. Lead is almost independent of the pH of the solution. In nearly neutral medium, the sorption capacity of Cr is 21.4 and that of lead is 24.3 mg/g. The optimum conditions for >96% Cr removal are 12 - 15 g clay/L, 40 - 50 minutes and a pH of 5 - 7. For lead, almost 100% removal can be attained using 12 - 15 g clay/L, 40 - 50 min. at a pH of 4 - 6. The effects of various operating parameters are discussed. Simultaneously, the lead shows a greater tendency to sorption than chromium and a ratio of 5:4 can best represent the occupation of the active surface of the clay. The most favorable conditions for simultaneous removing of Cr, 86% and Pb, 100% may be 12.5 g/L clay content and a pH of 7.5 within 30 minutes. The kinetic study of the results indicates the adsorption follow pseudo-second order kinetics in which chemical interaction is also involved. The kinetic study confirms the dependence of chromium adsorption on the pH of the medium being favoured at high pH values.
Removal of Nitrogen Dioxide and Sulfur Dioxide from Air Streams by Absorption in Urea Solution  [PDF]
Mahmood M. Barbooti, Neran K. Ibraheem, Awni H. Ankosh
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.22020
Abstract: The study focuses on the absorption rates of NO2, SO2 and a mixture of these two acid gases into urea solution in packed bed column. The absorption rate was studied as a function of absorbent temperature, urea concentration and acid gas concentration. The influence of liquid temperature between 10 - 40?C, urea concentration between 0.1 - 0.5 M and acid gas concentration NO2 between 100 - 1000 ppm (191 - 1910 mg/m3), SO2 between 500 - 2500 ppm (1310 - 6530 mg/m3) were investigated. The mass gas flow rate of 20.646 (kg/m2.min) at 25?C and the absorption rate were determined by measuring the NO2 and SO2 concentrations in the inlet and outlet streams of the absorptioncolumn. The absorption rate of SO2 increases with the decrease of temperature of absorbent (urea solution) and with the increase of the urea concentration. The presence of NO2 in the effluent gas stream lowers the absorption rate of SO2 in urea solution due to the fast reaction of NO2 with urea as compared with SO2. The absorption rate of NO2 decreases as the urea concentration exceeds 0.4 mol/l and for NO2 gas concentration of 100 ppm due to the decrease the diffusivity of the gas. The experimental data were analyzed using dimensionless analysis to find the correlation of mass transfer coefficient in the packed column Sh (H / dp)1.2 = 4.19*10–2 *(G' dp / μg)0.87 (μg / ρg DAB)0.60 The results confirmed the hypothesis that the absorption is accompanied with chemical reaction. Also it is found the increasing the temperature of absorbent solution the absorption rate of two gases is decreases. The mass transfer coefficient models are in good agreements with the Kramer’s equation.
Turbidimetric Determination of Hydrocarbon Contamination in Passaic River Sediments and Refinery Polluted Soils  [PDF]
Mahmood Mahdi Barbooti
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.27104
Abstract: A rapid method is described for the determination of petroleum hydrocarbons in soil samples. The method is based on the extraction of hydrocarbons by a solvent and the treatment of the solution with an aqueous solution of a surfactant to release the hydrocarbons to the water phase in the form of a stable emulsion. The emulsion is then utilized to measure the hydrocarbon content by turbidimetry. The effects of various operating parameters including the surfactant solution composition and time of extraction and time of mixing with the releasing solution are investigated. The stability of the emulsion was improved in acid environment containing and electrolyte. The turbidity values (T) were related with hydrocarbon concentration in the extract (C) by the following equation. Turbidity = 2.75 C + 205.7. With R2 = 0.9929. The soil hydrocarbon content (SHC) measured in µg/g can then be calculated using the formula: SHC = [Extract Vol. (mL) x C]/Sample Wt (g). The results correlated well with the results of total hydrocarbons in soils determined by standard methods. The method was applied for the estimation of hydrocarbons in Passaic river sediments taken from various locations and depths. For field work the method was used to supply data on the hydrocarbon contamination of soil samples taken within an oil refinery and a monitoring well drilled within heavy hydrocarbon waste dumping location.
Thermal and Ablative Properties of Ipns and Composites of High Ortho Resole Resin and Difurfurylidene Acetone
Tariq S. NAJIM,Amel M. NAJI,Mahmood M. BARBOOTI
Leonardo Electronic Journal of Practices and Technologies , 2008,
Abstract: High ortho resole resin was prepared by condensation of phenol with excess of formaldehyde in the presence of magnesium oxide as catalyst. Reaction of furfuraldehyde with acetone in basic medium led to difurfurylidene acetone (DFA). Their interpenetrating polymer network (IPNS) were obtained by the reaction of predetermined quantities of difurfurylidene acetone and high ortho resole using p-toluene sulphonic acid (PTSA) as curing agent. The thermal behavior of the resins was studied using thermogravimetry (TG) under ambient and nitrogen atmospheres over a temperature range of (25-1000 Co). It was observed that the IPN of 20% DFA – 80% resole has higher thermal stability than that of resole alone and the decomposition temperature was higher by 80 Co. This behavior was attributed to highly cross linked structure and thermally stable backbone of ploy difurfurylidene acetone due to formation of ladder structure.Impregnation of chopped fiber glass type (E) with the polymeric solutions was used to prepare their composites, and the ablative properties were investigated according to ASTM E-285 –80. It was observed that the IPN of (DFA- resol) perform better than the resole composite alone.
Recovery of Chromium from Waste Taning Liquors by Magnesium Oxide
Mahmood M. Barbooti,Mumtaz A. Zablouk,Usama A. Al-zubaidi
International Journal of Industrial Chemistry , 2010,
Abstract: This is a case study of AL-Za’afaraniya tanning factory, 15 km to the south of Baghdad, to spot light on simple chemical treatment of the discharged water to solve the environmental problems associated with its chromium content management. The treatment was extended to the recovery and reuse of chromium. Chromium was precipitated by the addition of magnesium oxide which also aid as a neutralizer for the acidic effluent. The laboratory treatment was carried out to find the optimum conditions. The wastewater samples were taken from the outline area of the tannery. Box-Wilson method was adopted to find useful relationships between the operating variables (temperature, mixing period and magnesium oxide dose) and the pH and chromium content of effluent. The experimental data were successfully fitted to second order polynomial mathematical models for the treatment. The most favorable operating conditions for the treatment were: temperature, 30 oC; mixing period, 50 min and magnesium oxide concentration, 3000 mg/L. On using the optimum conditions a mathematical model simulating the operation for the treatment was obtained as follows:Cr = 6.0848 – 0.001839 X11 – 0.105334 X12 – 0.041038 X13pH = 10.29086 – 0.001223 X11 – 0.140043 X12 – 0.00953 X13Experimentally Cr concentration was decreased to about (0.5 mg/L) in wastewater after raising the pH value to (7.35) by adding magnesium oxide.
Relationship between Serum Levels of Some Trace Elements, Disease Duration and Severity in Patients with Knee Osteoarthritis  [PDF]
Naza M. A. Mahmood
Pharmacology & Pharmacy (PP) , 2015, DOI: 10.4236/pp.2015.611051
Abstract: Background: Many trace elements in the biological system, including boron, are involved in various vital processes related to health and diseases. Boron has been proved to have a role in decreasing inflammatory pain, joint stiffness and other disabling symptoms associated with osteoarthritis (OA). Aims and Objective: The purpose of the present study was to evaluate the relationship between serum concentrations of copper (Cu), zinc (Zn), selenium (Se), manganese (Mn) and magnesium (Mg) with disease duration and severity in patients with knee OA. Methods: A total of 43 patients with knee OA were clinically evaluated and serum concentrations of Cu, Zn, Se, Mn and Mg were measured, and the results were compared with those of healthy controls. Trace elements levels were correlated with disease duration and severity. Results: Serum Cu and the value of Cu/Zn were significantly elevated in OA patients and positively correlated with disease duration and severity. Serum Zn, Se and Mn were significantly lower in patients compared with controls; Zn and Se were found to be negatively and significantly correlated with disease duration and severity. Conclusion: Patients with knee OA had higher levels of Cu and larger value of Cu/Zn and lower levels of serum Zn and Se; these changes were potentially correlated with the duration and severity of disease.
Loops in Digraphs of Lambert Mapping Modulo Prime Powers: Enumerations and Applications  [PDF]
M. Khalid Mahmood, Lubna Anwar
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.68045
Abstract: For an odd prime number p, and positive integers k and \"\", we denote \"\", a digraph for which?\"\" is the set of vertices and there is a directed edge from u to v if \"\", where ?\"\". In this work, we study isolated and non-isolated fixed points (or loops) in digraphs arising from Discrete Lambert Mapping. It is shown that if \"\", then all fixed points in \"\"?are isolated. It is proved that the digraph \"\"?has \"\"isolated fixed points only if \"\". It has been characterized that \"\"?has no cycles except fixed points if and only if either g is of order 2 or g is divisible by p. As an application of these loops, the solvability of the exponential congruence \"\"?has been discussed.
Evaluation of quality of drinking water from Baghdad, Iraq
M.M Barbooti, G Bolzoni, I.A Mirza, M Pelosi, I Barilli, R Kadhum, G Peterlongo
Science World Journal , 2010,
Abstract: This is a joint work between the Italian Red Cross and the Environmental Laboratories, Baghdad. The drinking water (DW) samples from 16 residential districts in Baghdad were chemically evaluated with reference to the raw water samples and water directly taken from the purification plants. In addition to the routinely measured parameters, 17 metals and 11 trihalomathane (THM) were measured. Generally, the samples of water analysed can be considered of good quality. The relatively high sulphate and aluminium contents results from the use of aluminium sulphate as flocculent. The ammonia and Nitrite concentrations were lower than the detectable limit, because ammonia is converted into chloramines and nitrite is converted into Nitrate during chlorination. This indicates no sewage contamination of the drinking water. The high chloride contents can be referred to the use of partially degraded hypo for the disinfection. The presence of THM's in the samples analysed is indicative of good disinfection process. The presence of these compounds is preferred better than bacterial contamination. The relatively high levels of zinc and iron have no impact on the quality of DW. Iron, however, was efficiently removed during the treatment, together with Manganese. Reference was done to the EU specification of drinking water regarding total hardness, chloride contents, sulphate, iron and THM's. As for the iron content, the original pH of the river water (7.5 and 8.0) ensures that Iron should not be present in soluble form at a detectable level. Corrosion of the pipes could be one of the reasons for the presence of iron. Key Words: Drinking water quality, heavy metals, sulphate, Aluminium, Trihalomethans, hardness.
A remark on the intersection of the conjugates of the base of quasi-HNN groups
R. M. S. Mahmood
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s0161171204309191
Abstract: Quasi-HNN groups can be characterized as a generalization of HNN groups. In this paper, we show that if G∗ is a quasi-HNN group of base G, then either any two conjugates of G are identical or their intersection is contained in a conjugate of an associated subgroup of G.
Page 1 /402594
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.