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Search Results: 1 - 10 of 87718 matches for " I. Akinlua "
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Physico-chemical and Trace Metal Characterization of Battery Factory Wastewater
A. Akinlua,O.I. Asubiojo
Journal of Applied Sciences , 2006,
Abstract: The physico-chemical and trace metal analyses of battery factory wastewater were carried out in this study. Samplings were done three times in a period of nine months at settling tank (i.e., before treatment) and at final discharge point (after treatment). High levels of pH, conductivity, Pb, Fe and Zn were observed, which may affect the health of the aquatic ecosystem of the receiving river. The high levels of conductivity, Pb, Fe and Zn may also adversely affect the health of the community that uses the receiving river directly for domestic use without treatment. The treatment technique employed by the factory is grossly ineffective for the removal of Pb, Fe and Zn but effective for removal of Cu and Cd.
Mobility and Transport of Inorganic Species in Weathered Hydraulic Disposed Coal Fly Ash: An Insight from Geochemical Fractionation and Statistical Evaluation
S. A. Akinyemi,O. I. Ojo,W. M. Gitari,A. Akinlua
Energy Science and Technology , 2012, DOI: 10.3968/j.est.1923847920120301.154
Abstract: A large volume of coal fly ash generated through combustion process has raised environmental concerns due to possible release of potentially toxic species to the surface and groundwater systems. The chemical partitioning and mobility of elements in the hydraulic disposed ash dump was investigated using modified sequential extraction scheme. The geochemical distribution of the investigated elements in 33 drilled core samples was determined by x-ray fluorescence and inductively coupled plasma mass spectrometry. The ternary plot of major elements as determined by XRF showed that hydraulic disposed ash cores are sialic, ferrosialic and ferrocalsialic in chemical composition. The relationship between SiO2 and chemical index of alteration (CIA) showed low, moderate to high degree of weathering. These chemical compositions and degree of chemical weathering depend on the ash sampling point and ash interaction chemistry. The Na+ and K+ soluble salts showed evidence of leaching and downward migration in the water soluble fraction indicating that the hydraulic disposed ash dump is not a sustainable salt sink. The geochemical partitioning reveals that mobility and transport of potentially toxic metal species are governed by the pore water pH, ash interaction chemistry and the sampling point of the ash cores. The chemical interaction of drilled core ash with the ingress CO2 and percolating rain water led to dissolution and co-precipitation of soluble major components in fly ash. This had led to incoherent patterns of elements in carbonate fraction of the ash cores. Key words: Modified sequential extraction; Hydraulic disposed ash; Chemical index of alteration; Pore water pH; Ash interaction chemistry; Moisture content; Chemical weathering
Evaluation of Oxidative Stress and Antioxidant Level of Stroke Patients in Osun State, South-Western Nigeria  [PDF]
I. Akinlua, M. F. Asaolu, O. C. Ojo, G. O. Oyebanji
Journal of Biosciences and Medicines (JBM) , 2019, DOI: 10.4236/jbm.2019.75020
Abstract: Stroke is a leading cause of morbidity and mortality worldwide. Oxidative stress which is as a result of increased activity of free radicals and decreased antioxidant mechanism plays a major role in the pathogenesis of stroke. This study determined the plasma level of malondialdehyde (MDA), a marker of lipid peroxidation and oxidative stress and enzymatic Antioxidants namely, superoxide dismutase (SOD), Glutathione peroxidase (GPx), and Catalase (CAT) in sixty stroke patients of both sexes attending Wesley Guide Hospital, Obafemi Awolowo University Teaching Hospital, Ilesa, Osun State. An equal number of healthy subjects were used as control. The result of this study revealed a significantly (p < 0.05) high plasma level of MDA in stroke patients when compared with the control subjects. Plasma level of SOD in stroke patients was significantly higher (p < 0.05) than the control subjects while plasma GPx and CAT level were found to be significantly lower (p < 0.05) in stroke patients than the control subjects. The result of the study indicated high level of lipid peroxidation and oxidative stress in stroke patients and high degree of free radicals presence as indicated by the high level of SOD.
Petrography and stable isotope geochemistry of cretaceous sandstones, Orange Basin, South Africa
Solomon Adeniyi Adekola,Akinsehinwa Akinlua
Journal of Petroleum Exploration and Production Technologies , 2013, DOI: 10.1007/s13202-013-0050-5
Abstract: Some siliciclastic rock samples of the Orange Basin were subjected to diagenetic and reservoir quality evaluation; 33 core and side wall core samples from 8 wells within the genetically related packages (systems tracts); lowstand systems tract, transgressive systems tract and highstand systems tract were collected for this study, to determine the prevailing conditions at deposition and post deposition of the sediments within the age bracket of Barremian to Campanian. The samples were subjected to petrographic and mineralogical analyses including bulk stable isotope analysis of oxygen and carbon. From the petrography of the samples, the basin shows complex diagenetic histories which include compaction, cementation/micritization, dissolution, overgrowth of quartz, and fracturing. The Eh–pH shows that the cements in the area of the basin under investigation were precipitated under weak acidic and slightly alkaline conditions. The δ18O isotope values of the samples range from 1.648 to 16.180 % whilst δ13C isotope values range from 25.86 to 6.95 %, which is indicative of terrestrial biomass contribution. The plot of δ18O versus δ13C shows that the sediments were deposited in shallow marine temperate conditions with some Barremian and Aptian samples more marine. There is no significant variation of δ13C isotope values across the stratigraphic sequences, which could be an indication that the burial diagenesis does not have significant effect on geochemical pattern of the δ13C isotope in the sandstones but contribution from land-derived materials. The authigenic minerals precipitated blocked the grain interspaces and interlayers and with continued burial, compaction impeded the development of secondary porosity resulting in the poor reservoir quality. The origins of the cementing materials were both autochthonous and allochthonous.
Nematicidal effects of Leucaena leucocephala and Gliricidia sepium extracts on Meloidogyne incognita infecting okra
Adekunle O.K.,Akinlua A.
Journal of Agricultural Sciences , 2007, DOI: 10.2298/jas0701053a
Abstract: Two separate but identical greenhouse trials were conducted to investigate the effects of extracts of leaves and roots of Leucaena leucocephala and Gliricidia sepium each at 80,000 mg / kg and 40,000 mg / kg on Meloidogyne incognita on okra. Each potted nine-day old okra seedling was inoculated with 3,000 fresh eggs of M. incognita and 5ml of each of the extracts was added simultaneously around the roots of the seedling. Treatment of okra plant with L. leucocephala and G. sepium extracts resulted in reduced nematode population, reduced galling, reduced nematode reproduction rate and enhanced fruit weight. Chemical analysis revealed that G. sepium leaves contained phenolic compound and carboxylic acid, while the roots showed the presence of aromatic amide, phenolic compound and carboxylic acid. L. leucocephala leaves showed the presence of phenolic compound, aromatic amide and carboxylic acid, while the roots showed the presence of phenolic compound and carboxylic acid. The results of this study suggest that leaf and root extracts of L. leucocephala and G. sepium at the rate of 40,000 mg / kg could be useful in root knot nematode management in vegetable beds.
Maternal Plasma Lipid Profile in Women Screened for Gestational Diabetes Mellitus (GDM)  [PDF]
Adeniran Samuel Atiba, Babatunde Ajayi Olofinbiyi, Akindele Rasaq Akintunde, Aduloju Olusola Peter, Ojo Olubunmi Clementinah, Akinlua Ibikunle
Open Journal of Obstetrics and Gynecology (OJOG) , 2017, DOI: 10.4236/ojog.2017.712123
Abstract: Objective: This is to determine the plasma lipid profile status of patients diagnosed with gestational diabetes mellitus. Methodology: Seventy-nine pregnant women between gestational age of 24 and 28 weeks out of which 23 and 16 were diagnosed of having GDM using IADAPSG and WHO guidelines respectively were recruited into the study. Plasma lipid profile was determined among the study groups using standard laboratory techniques. Results: Higher numbers of women were diagnosed with GDM using IASDAPG criteria than when WHO criteria were used. Plasma lipid profile showed no significant difference between women with GDM and Non-GDM irrespective of guidelines used in the diagnosis of GDM. Conclusion: Pregnancy and Gestational Diabetes Mellitus may have influence on lipid metabolism but not likely in the second trimester of pregnancy as observed in our study.
Preliminary Assessment of Rare Earth Element Contents of Niger Delta Oils
A. Akinlua,T.R. Ajayi,B.B. Adeleke
Journal of Applied Sciences , 2006,
Abstract: A preliminary study of the rare earth element contents of some Niger Delta oils was carried out to evaluate their influence on petroleum system of the Niger Delta Basin. The oil samples were obtained from an onshore field in the Niger Delta and analyzed using Inductively Coupled Plasma Mass Spectrometric (ICP-MS) analytical technique. Four Light Rare Earth Elements (LREE), La, Ce, Nd and Pr were detected. Their concentrations varied from 0.009 to 0.49 ppb, 0.058 to 1.58 ppb, 0.01 to 0.47 ppb and 0 to 0.18 pbb, respectively. All the LREE showed significant and positive correlation with each other and also have significant correlation with aromaticity index (Toluene/nC7). The study showed that REE are not good for classification of oils but provide another tool in oil-oil correlation.
A Geochemical Analytical Scheme for the Appraisal of Partitioning and Mobility of Major elements in Weathered Dry Disposed Coal Fly Ash
S. A. Akinyemi,A. Akinlua,W. M. Gitari,R. O. Akinyeye
Energy Science and Technology , 2011, DOI: 10.3968/j.est.1923847920110202.109
Abstract: South Africa is endowed with significant deposits of coal which is utilized in electricity generation to meet the nation’s energy demand. A large volume of waste solid residue from the combustion of pulverized feed coal in power stations is dry disposed in stock piles or dumps. Chemical interactions of dry disposed fly ash with ingressed CO2 from the atmosphere and infiltrating rain water would cause dissolution of the soluble components in the fly ash matrix. Chemical partitioning and mobility of major elements in samples from cores drilled into serially stacked weathered dry disposed fly ash were investigated using a modified five steps sequential extraction scheme. A total acid digestion was carried out on the original ash core samples prior to extraction to validate the extraction procedure. The geochemical distribution of the investigated major elements in 59 drilled core samples was determined by x-ray fluorescence and inductively coupled plasma mass spectrometry. The relationship between SiO2 and chemical index of alteration (CIA) showed 8 year and 20-year-old core samples have a moderate to high degree of weathering. Conversely, 1-year-old cores samples showed characteristics between low and moderate-high degrees of weathering. A cluster and discriminant analysis of the major elements was also able to reveal the subtle chemical alteration differences of the core samples. Functional analysis revealed the disparities in the dissolution patterns of major soluble components in the matrix of the drilled core samples. Modified sequential extractions revealed high concentration of the major species in the leachates for every mineralogical fraction; although the bulk of the major elements are locked up in the insoluble phase of the core samples (i.e. residual fraction) which would not be released under normal environmental conditions. It is noteworthy that the concentration of major elements in the labile fractions (water soluble + exchangeable + carbonate) was high and this has implications for the long-term durability of residual mineral phases. Relative enrichment and depletion trends of major elements are promoted by heterogeneity in the ash dump (i.e. moisture content), gradual reduction of pore water pH and continuous brine and water irrigation. Key words: Coal fly ash; Weathering; Sequential extraction scheme; Cluster analysis; Factor Analysis
An Investigative Study on the Chemical, Morphological and Mineralogical Alterations of Dry Disposed Fly Ash During Sequential Chemical Extraction
S. A. AkinyemiA.,A. Akinlua,W. M. Gitari,S. M. Nyale
Energy Science and Technology , 2012, DOI: 10.3968/j.est.1923847920120301.161
Abstract: The hazardous elements associated with various physicochemical forms in coal fly ash are of environmental concern due to their leaching potential and subsequent contamination of surface and groundwater in the vicinity of the ash dump. Selective sequential extraction was performed on dry disposed fly ash samples from a coal-fired power station in Mpumalanga province, South Africa. The alteration of the chemical, morphological and mineralogical species of weathered fly ash during the selective sequential extraction was investigated using X-ray fluorescence (XRF), Nano-scan electron microscopy (NANOSEM) and X-ray powder diffraction (XRD). Insoluble residue from the water-soluble fraction is composed of amorphous alumino-silicate. The residues from exchangeable carbonate and Fe and Mn fractions consisted mostly of amorphous alumino-silicate spheres with a lesser quantity of iron-rich spheres. The iron-rich spheres are surrounded by amorphous alumino-silicate spheres. The leaching behavior of trace metals (such as Ce, Y, Nb, Rb, U, and Tl) in weathered dry disposed fly ash was considered to have a dependency relationship with the components of SiO2, CaO, MgO, P2O5, and amount of unburned carbon. The decrease in the quantities of calcite with successive extraction could be considered as a marker of progress of sequential extraction technique. At the same time, the increase in the quantities of quartz could be also considered as an indicator of progress of the sequential extraction scheme. Trace elements bound to exchangeable or carbonate fraction during sequential chemical extraction were found associated with calcite. The elemental concentrations, as determined by electron dispersive x-ray spectroscopy (EDS), were consistent with XRF and XRD data. Therefore, the chemical extractant used in this study proved efficient for extraction of inorganic metals associated with various physicochemical forms in weathered fly ash. Key words: Coal fly ash; Selective sequential extraction; Major components; Trace elements; Morphology; Mineralogical composition
"FAILURE" OF THE GLOBAL MARKET ПРОВАЛ ГЛОБАЛЬНОГО РЫНКА ПРОВАЛИ ГЛОБАЛЬНОГО РИНКУ
Т.В. КАМIНСЬКА
Strategy of Ukraine : Economics, Sociology, Law , 2011,
Abstract: The question of origin of failures is considered in a global market, influence of TNK on an origin and functioning of such processes. Analysis of redistribution of development of countries. Рассмотрены вопросы возникновения провалов в глобальном рынке, влияние ТНК на возникновение и функционирование таких процессов. Проанализированы перераспределение развития стран. Розглянуто питання виникнення провал в у глобальному ринку, вплив ТНК на виникнення та функц онування таких процес в. Проанал зовано перерозпод л розвитку кра н.
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