Abstract
Groundwater compositions could be altered significantly due to geogenic and anthropogenic inputs from rock and human respectively. Such impacted water may be injurious to health if consumed. Studies of groundwater within the lateritic overburden on migmatite gneiss and pegmatised schist in Ibadan area were undertaken with the aim of determining their physico-chemical composition and portability. Groundwater within lateritic profiles over NE-SW trending migmatite and pegmatised schist were sampled. The temperature of the water ranged from 23.9 to 32.7°C, electrical conductivity from 60 to 580 µS/cm, pH from 5.5 to 7.3 and TDS from 55 to 422 mg/L. The concentrations of cations in mg/L ranged for Ca2+ (62.2-79.4), Mg2+ (7.5-15.3), Na+ (28.2-54.3), and K+ (55.0-85.1) while the anions are HCO3- (116.1-149.2), SO42- (0.0-1.1), Cl- (8.2-22.1) and NO3- (0.3-2.2) mg/L. These chemical data are characteristic of Na-(K)-HCO3 water type. The cations, anions and the trace metals of the groundwater are generally within the WHO standards. The low level of chemical constituents in the groundwater reflects geogenic input arising from weathering of the basement rocks. The water is good for domestic, industrial and irrigation purposes. Key words: Groundwater, water portability, migmatite, pegmatised schist, hydrochemistry.
Highlights
The provision of good quality water is crucial for sound human and environmental health, economic and sustainable development
The rock types mapped in the study area during the present investigation include migmatites, granite gneiss, pegmatised quartz muscovite schist and quartz veins (Figure 2)
Parallel and cross-cutting veins and irregular pods of paleosomatic and neosomatic compositions occur within the migmatites
Summary
The provision of good quality water is crucial for sound human and environmental health, economic and sustainable development. Groundwater chemistry is altered as a result of the interaction between the subsurface materials or rocks and the percolating water Apart from this geogenic influence, anthropogenic activity in the study area makes the groundwater system in the area prone to possibility of contamination. A proper understanding of the groundwater and surface water in the study area is of paramount importance so as to maintain good quality water for drinking, irrigation and other domestic purposes
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