Hydrogeochemical Signatures And Quality Assessment Of Groundwater In Okpoko And Environs, Southeastern Nigeria

Nwankwoala, H. O () and Ememu, A. J
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Nwankwoala, H. O: Department of Geology, University of Port Harcourt, Nigeria
Ememu, A. J: Department of Geology, Gregory University Uturu, Abia State, Nigeria

Pakistan Journal of Geology (PJG), 2018, vol. 2, issue 1, 6-11

Abstract: This study is aimed at assessing the hydro-geochemical signatures of groundwater in Okpoko and Environs in Anambra State, Southeastern Nigeria. Fifteen groundwater samples were collected and analyzed for physico-chemical, heavy metals and hydrocarbon content. Heavy metals in groundwater were analyzed using Atomic Absorption Spectrometer. The groundwater analyses revealed that average pH (6.05), Fe (0.68 mg/L) and Ni (0.028 mg/L) values exceeded WHO and NSDWQ guidelines. Total Petroleum Hydrocarbons (TPH) in groundwater were relatively very low and recorded only in BH1 (0.04 mg/L) and BH2 (0.002 mg/L) and below detectable limit for all other sampled boreholes. Piper diagram revealed two hydro-chemical facies: Mg-HCO3 and Ca-HCO3 rich water, while Stiff diagrams confirmed four distinct water types (Ca2+, Mg2+, HCO3; Ca2+, HCO3; Ca2+, Na++K+, Cl-, HCO3; Ca2+, Cl- Class). Gibb’s diagrams revealed that chemical weathering of rock and precipitation are the major influences on the groundwater quality. The various ionic ratios: Mg/Ca (0.56), HCO3/Cl (3.31), (Na + K)/Cl (1.45), Na/K (1.61), Ca/Na (7.0), SO4/Cl (0.67) and CEV (-0.45) suggests the groundwater sources are of inland origin. Groundwater flow direction shows that the area is drained by the Niger River on the western part of the study area.

Keywords: Groundwater quality; water types; hydro-geochemistry; facies; heavy metals (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbnpjg:v:2:y:2018:i:1:p:6-11

DOI: 10.26480/pjg.01.2018.06.11

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