Browsing by Author "Ojoawo, Ayobami Ismaila"

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    Application of frequency selection and geoelectrical sounding methods for mapping of leachate’s pathways in an active dumpsite
    (Springer Nature Switzerland, 2023) Adagunodo, Theophilus Aanuoluwa; Ojoawo, Ayobami Ismaila; Anie, Nicholas Oliseloke; Edukugho, Praise Oforitsenere
    Contamination of surrounding environments is one of the threats to the proper maintenance of municipal waste sites in developing nations. This study integrates natural electromagnetic (EM) field and geoelectrical sounding methods to assess the leachate’s pathways in the near-surface layers and groundwater system in and around an active dumpsite. Five natural EM traverses were obtained in varying orientations using PQWT-TC 150 model. Fifteen vertical electrical sounding (VES) data points were randomly occupied using SAS 4000 ABEM resistivity meter. The two techniques revealed some intercalations of conductive and resistive media in the study area. The conductive media are composed of mixtures of leachates into clay and groundwater units, thereby creating zones of very low electrical potential differences from the surface to a depth beyond 30 m. A zone of leachate-aquifer’s interphase exists between the third layer and the fourth layer. The directions of the fluid flow are in the S–N and SE–NW trends, which could be linked to the fault towards the northwestern part of the study area. The fluid dynamics, however, justified the reason for the thick conductive materials being mapped at the northwestern and northern parts of the study area.
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    Fluoride Concentrations Within the Shallow Aquifers in Iree, Southwest Nigeria
    (Springer Nature Switzerland, 2024) Adagunodo, Theophilus Aanuoluwa; Adeniji, Adetunji Ayokunnu; Ojoawo, Ayobami Ismaila; Ajao, Adekunle Mayowa
    Assessing the toxic fluoride concentration in groundwater is critical and vital, since its occurrence in the water has been linked to the natural deposition of parent rocks during weathering. Consumption of fluoride in water can cause serious health problems, such as skeletal fluorosis, dental fluorosis, fertility reduction, urinary tract infection and disorder, nervous system damage and so on. The aim of this study is to determine the fluoride contamination level in the shallow aquifers of a crystalline basement system in Iree community, south-west Nigeria. Fifteen near-surface wells were tested for fluoride constituents and the determination of some physical parameters (such as pH and water temperature). Samples were analyzed by colorimetry in order to determine fluoride concentrations. The normality of the data was tested using the Kolmogorov–Smirnov test, while the fluoride constituents in the water samples were compared to the World Health Organization (WHO) threshold. The obtained fluoride contents varied from 0.75 to 1.5 mg.l−1 , the pH varied from 6.89 to 8.07, and the water temperature varied from 26.8 to 30.5 °C. It was revealed that some near-surface wells exceeded the WHO permissible standard of 1.0 mg. l −1 for fluoride constituents in potable water. Based on these results, it could be concluded that a crucial and periodic assessment of the near-surface wells is recommended to keep track of the fluctuations in the fluoride concentrations within the study area. The outcome of this study will serve as baseline guidance for policy-makers as well as the concerned authorities to know the degree of fluoride constituents in their shallow wells and to proffer possible solutions in mitigating these pollution risks as soon as possible.