Hydrochemical evaluation of the Voltaian system-The Afram Plains area, Ghana

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dc.contributor.author Yidana, S.M.
dc.contributor.author Ophori, D.
dc.contributor.author Banoeng-Yakubo, B.
dc.date.accessioned 2019-04-12T09:41:33Z
dc.date.available 2019-04-12T09:41:33Z
dc.date.issued 2008-10
dc.identifier.other Vol.88(4): pp 697-707
dc.identifier.other DOI: 10.1016/j.jenvman.2007.03.037
dc.identifier.uri http://ugspace.ug.edu.gh/handle/123456789/29183
dc.description.abstract Inverse geochemical modeling from PHREEQC, and multivariate statistical methods were jointly used to define the genetic origin of chemical parameters of groundwater from the Voltaian aquifers in the Afram Plains area. The study finds, from hierarchical cluster analysis that there are two main hydrochemical facies namely the calcium-sodium-chloride-bicarbonate waters and the magnesium-potassium-sulfate-nitrate waters in the northern and southern sections, respectively, of the Afram Plains area. This facies differentiation is confirmed by the distribution of the SO42-/Cl- ratio, which associates groundwater from the northern and southern sections to areas influenced by contact with evaporites and seawater, respectively. Principal component analysis (PCA) with varimax rotation using the Kaiser criterion identifies four principal sources of variation in the hydrochemistry. Mineral saturation indices calculated from both major ions and trace elements, indicate saturation-supersaturation with respect to calcite, aragonite, k-mica, chlorite, rhodochrosite, kaolinite, sepiolite, and talc, and undersaturation with respect to albite, anorthite, and gypsum in the area. Inverse geochemical modeling along groundwater flowpaths indicates the dissolution of albite, anorthite and gypsum and the precipitation of kaolinite, k-mica, talc, and quartz. Both the PCA and inverse geochemical modeling identify the incongruent weathering of feldspars as the principal factors controlling the hydrochemistry in the Afram Plains area. General phase transfer equations have been developed to characterize the geochemical evolution of groundwater in the area. A very good relationship has been established between calcite and aragonite saturation indices in the Afram Plains area, with R2=1.00. © 2007 Elsevier Ltd. All rights reserved. en_US
dc.language.iso en en_US
dc.publisher Journal of Environmental Management en_US
dc.subject Afram plains en_US
dc.subject Hierarchical cluster analysis en_US
dc.subject Inverse modeling en_US
dc.subject PHREEQC en_US
dc.subject Principal component analysis en_US
dc.title Hydrochemical evaluation of the Voltaian system-The Afram Plains area, Ghana en_US
dc.type Article en_US

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