Browsing by Author "Omotoso, Oladele Ajiboro"

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    PRELIMINARY STUDY OF HYDROCHEMISTRY OF ELEYELE LAKE AND ITS TRIBUTRIES, IBADAN, NIGERIA
    (Faculty of Science, Adamawa State University, Nigeria, 2011) Omotoso, Oladele Ajiboro; TIJANI, Moshood
    Hydrochemical evaluation and distribution of major and trace metals in water of Eleyele Lake and its feeding streams (tributaries) within Ibadan, south-western Nigeria is presented in respect of anthropogenic and geogenic contaminations from the surrounding catchments. The aim of the study is to delineate the degree of concentration of metals in the water phase. ICP-OES method was used for the hydrochemical analysis. The results revealed no practical contamination of these metals in terms of its domestic usability in both the tributaries and the main Lake because the values are below W.H.O. standard for potable water. The AF values are less than 1 and the Igeo- values less than 0. However, the average values of Sodium Absorption Ratio (SAR) recorded in the feeding stream (tributaries) is 10.6 and 5.9 in the main Lake. This is an indication of potential problem for irrigation water. Furthermore, the major metals have good correlation coefficient values (>0.6) with one another. This shows their close associations and could be attributed to their geogenic sources from the catchments’ bedrock. Some of the trace metals show negative correlation with the major metals, TDS and the EC. This reflects different sources and controlling processes. The water is suitable for domestic purposes rather than Agriculture because of the Na + level contamination as revealed by the SAR value
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    Stable Isotopic Signatures (18O and 2H) and Hydrochemistry in Assessing Basement Aquifer Recharge and Driving Forces of Groundwater Quality in Parts of Ilorin, Northcentral Nigeria
    (University of Technology Sarawak, 2025-01-14) Yusuf, Mumeen Adebayo; Abiye, Tamiru Alemayehu; Alao, Joseph Omeiza; Ibrahim, Kehinde Olojoku; Oyeleke, Tolulope Ayobi; Awujo, Emmanuel Daberechukwu; Omotoso, Oladele Ajiboro; Iheme, Kenneth Obinna,; Bakare, Ussein Taiwo; Omorinoye, Omolayo Ajoke
    Groundwater resources in parts of Asa Local Government Area in Kwara State, Nigeria are threatened by increasing pressure due to growing population, and agricultural and industrial activities, which necessitates a comprehensive assessment of the groundwater resources to ensure their sustainability and safety for human consumption. Evaluation of groundwater resources in parts of Asa Local Government Area in Kwara State, Nigeria was undertaken using the integration of stable isotope of δ18O and δ2H and hydrogeochemical tools including Water Quality Indexes, Gibbs diagrams, and Chadha diagram towards deciphering the source of groundwater recharge as well as factors controlling its chemistry in the study area. The collected groundwater samples from shallow wells and deep boreholes were subjected to major ions, trace elements, and isotope analyses. Hydrochemical models revealed Ca-Mg-HCO3, mixed Ca-Na-HCO3, and Na-HCO3 water facies suggesting the early transformation stage of the groundwater. The WQI indexes ratings revealed essentially fair to good to excellent water quality for human consumption. The isotope values in groundwater samples vary between - 4.12±0.1 ‰ and -2.60±0.1 ‰ and between -15.0±0.2 ‰ and -24.0±0.2 ‰ for δ18O and δ2H, respectively, indicating isotopically relatively enriched groundwater. The plot of δ18O and δ2H in groundwater samples along meteoric lines indicate meteoric origin with little effect of evaporation. Residence time evaluation using Ec and δ18O relationship identified recent recharge and recent recharge but polluted groundwater. In addition, the relation between salinity and δ18O revealed water-rock interaction as the main geochemical process controlling groundwater chemistry.