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Studies on major ion chemistry and hydrogeochemical processes of groundwater in Port Harcourt City, southern Nigeria

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Authors:Nwankwoala, H. O.; Udom, G. J.
Author Affiliations:Primary:
University of Port Harcourt, Department of Geology, Port Harcourt, Nigeria
Volume Title:Journal of Spatial Hydrology
Source:Journal of Spatial Hydrology, 11(1), p.34-40. Publisher: American Spatial Hydrology Union, North Lauderdale, FL, United States. ISSN: 1530-4736
Publication Date:2011
Note:In English. 29 refs.; illus., incl. 4 tables, sketch map
Summary:Of recent, the rapid deterioration of groundwater quality in Port Harcourt, southern Nigeria due to unregulated exploitation resulting from increasing growth in the oil and gas production activities has become a major concern. The predisposition of groundwater to pollution and the realization of its serious health and economic consequences demand knowledge of the ambient groundwater quality and of the processes leading to an improved understanding of the groundwater in the area. Groundwater samples were collected from eighteen (18) representative boreholes spread over the Port Harcourt City. This was done to assess and determine the geochemical processes occurring within the aquifer systems using groundwater chemistry and ionic ratios. Properties such as electrical conductivity, pH and major ion concentrations, such as Ca, Mg, Na, K, Cl, HCO3, and SO4, of groundwater were taken into consideration. Concentrations of these cations and ions in the groundwater systems of the area vary spatially and temporally. Abundance of these ions are in the following order: Ca > Mg > Na > K = HCO3 > Cl > SO4 > NO3. Ca-Mg-HCO3 and Ca-Mg-SO4-Cl are the dominant hydrochemical facies of the study area. Results show that ion-exchange processes, carbonate and silicate weathering are responsible mechanisms for the groundwater chemistry of the area. Hydrochemical indices (Mg/Ca, Cl/HCO3 and Cation Exchange Values (CEV) generally indicates low-salt inland waters, with minimal marine influence. The hydrochemical evidence reveals the importance of recent management decisions (reduced exploitation/controlled pumping) in determining the evolution and distribution of groundwater salinity within the aquiferous zones. This framework, as the study observes, will lead to improved.
Subjects:Agbada Formation; Aquifer vulnerability; Aquifers; Basins; Cation exchange capacity; Cenozoic; Chemical composition; Clastic rocks; Concentration; Contaminant plumes; Degradation; Digital terrain models; Drainage basins; Drilling; Electrical conductivity; Ground water; Hydraulic conductivity; Ions; Lithostratigraphy; Monitoring; Multiple aquifers; Oil wells; PH; Pollution; Pumping; Salinization; Sandstone; Sedimentary basins; Sedimentary rocks; Shale; Transmissivity; Water hardness; Water management; Water quality; Water resources; Africa; Niger Delta; Nigeria; West Africa; Benin Formation; Port Harcourt Nigeria
Coordinates:N043000 N050000 E0073000 E0064500
Record ID:813095-2
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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