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    Wyświetlanie 1-4 z 4
    Tytuł:
    Determination of heavy metals of road deposited sediment in Ado-Ekiti, Nigeria using XRF Technique
    Autorzy:
    Ogunmodede, O. T.
    Ajayi, O. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/411774.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    X –Ray fluorescence (XRF) technique
    heavy metals
    soil pollution
    anthropogenic
    Opis:
    In this work x-ray fluorescence(XRF) technology was used to evaluate the soil pollution with heavy metals (K, Ti, Cr, Mn, Fe, Cu, Zr) in rain run-off deposited metal sediment of road side soil in Ado Ekiti, Nigeria. The investigated sediment of road side was collected in open places along the road at different districts in Ado Ekiti. XRF was carried out at the laboratory of Obafemi Awolowo University centre for energy research using handheld thermo scientific energy-dispersive XRF analyzer. The experimental result indicate that the concentration of heavy elements in Adebayo road is the highest level detected while the road at new Iyin road is lowest and they are greater than the level detected in a control soil collected from a zone situated far from the road. For the majority of metals, pronounced maximum, concentrations were detected in the site. Anthropogenic releases give rise to highest concentrations of the metals relative to the normal background values and in some locations their levels exceed the alert level admitted by the Nigeria guideline.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 2; 36-40
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing adsorption capacity of clay and application in dye removal from waste water
    Autorzy:
    Ogunmodede, O. T.
    Adebayo, O. L
    Ojo, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412039.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    snail shell
    methylene blue
    natural clay
    langmuir
    freundlich
    temkin
    Halsey and Harkins-Jura isotherm equations
    Opis:
    Natural clay has been considered as a potential absorbent for removing pollutants from water and waste water. Nonetheless, the effective application of clay for water treatment is limited due to small surface area and presence of net negative surface charge, leading to it low adsorption capacity. The absorption capacity was boosted via intercalation of CaO derived from snail shell (SS). The methylene blue sorption potential, PZC, and the surface area of unmodified clay sample were substantially enhanced by the intercalation process. The process of sorption of MB from solution was analyzed using five different isotherm models (Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations). The value of the Langmuir monolayer sorption capacity qm (mg/g) increased from 50.12 to 88.71, PZC values increased from 4.50 to 7.40, and the surface area (m2/g) value increased from 27 m2/g to 123 m2/g after the intercalation process. The experimental data were fitted into two kinetic models: Lagergren pseudo-first order and the chemisorptions pseudo-second order. It was observed that chemisorptions pseudo-second order kinetic model described the sorption process with high coefficients of determination (r2) better than pseudo first other kinetic models. The modification caused no change in the clay surficial microstructure but increased the lattice spacing of the clay framework.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 35-51
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of microbial and heavy metal concentration per distance and depth at a municipal solid waste Landfill
    Autorzy:
    Ogunmodede, O.T.
    Ojo, A.A.
    Adebayo, O.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/11267.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The field study involved 4 sites and 15 samples according to the wind directions: North, East, South and West. The analysis was conducted through the use of Atomic Absorption spectroscopy (AAS). Ten types of heavy metals were identified as indicators for pollution namely Mg, Ca, Mn, Fe, Cu, Zn, Pb, Ni, Cr, and Cd. The results indicated that the concentration of Fe was the most dominant per specific distances and depths and exceeded the minimum standard in North, East and West directions. While Cu was the second most dominant with concentration exceeding minimum standard per specific distance and depth, mainly in the West direction. The results have shown presence of bacterial species including Pseudomonas, Mirococcus, Actinomyces, Neisseria, Bacillus and Klebsiella. These pathogens can infect wounds and cause sepsis and mortality and can even occur with such organisms to cause secondary infection. These groups of organisms are almost impossible to control since they are ubitiquous.
    Źródło:
    International Letters of Natural Sciences; 2014, 22
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of nitrosamine in roasted food base on the roasting methods
    Autorzy:
    Ogunmodede, T.T.
    Ojo, A.A.
    Jegede, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/11202.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The present study examined the interrelationships of roasting methods and nitrosamine compounds (NA) content in eleven food sample investigated. The total level of NA in examined food ranged from 1.1x10-3 μg per g in oven roasted white maize to 5.0x10-3 μg per g in wood roasted pig meat that is lower than the legal level in WHO (0.001 μg per kg ). The significant increase of NA concentration in all food samples on roasting was observed. Methods of roasting have significant effects on the level of nitrosamine in each of the material used.
    Źródło:
    International Letters of Natural Sciences; 2016, 50
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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