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Hydrogeochemical evaluation of groundwater in the lower Offin basin, Ghana

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Environmental Geology

Abstract

Alumino-silicate mineral dissolution, cation exchange, reductive dissolution of hematite and goethite, oxidation of pyrite and arsenopyrite are processes that influence groundwater quality in the Offin Basin. The main aim of this study was to characterise groundwater and delineate relevant water–rock interactions that control the evolution of water quality in Offin Basin, a major gold mining area in Ghana. Boreholes, dug wells, springs and mine drainage samples were analysed for major ions, minor and trace elements. Major ion study results show that the groundwater is, principally, Ca–Mg–HCO3 or Na–Mg–Ca–HCO3 in character, mildly acidic and low in conductivity. Groundwater acidification is principally due to natural biogeochemical processes. Though acidic, the groundwater has positive acid neutralising potential provided by the dissolution of alumino-silicates and mafic rocks. Trace elements’ loading (except arsenic and iron) of groundwater is generally low. Reductive dissolution of iron minerals in the presence of organic matter is responsible for high-iron concentration in areas underlain by granitoids. Elsewhere pyrite and arsenopyrite oxidation is the plausible process for iron and arsenic mobilisation. Approximately 19 and 46% of the boreholes have arsenic and iron concentrations exceeding the WHO’s (Guidelines for drinking water quality. Final task group meeting. WHO Press, World Health Organization, Geneva, 2004) maximum acceptable limits of 10 μg l−1 and 0.3 mg l−1, for drinking water.

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Acknowledgments

This work was supported by CSIR Water Research Institute. The authors are therefore, grateful to the staffs of CSIR Water Research Institute, who were also involved in the data collection for this study but have not been mentioned. We also wish to thank Mr. Harrison Komladze and Rex Sapaah of the CSIR-Water Research Institute, Ghana for preparing the Location map.

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Authors and Affiliations

  1. CSIR-Water Research Institute, P. O. Box M32, Accra, Ghana

    Benony K. Kortatsi, Collins K. Tay & Grace A. Dartey

  2. Civil Engineering Department, KNUST, Kumasi, Ghana

    Geophrey Anornu

  3. Geology Department, University of Ghana, Legon, Accra, Ghana

    Ebenezer Hayford

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  1. Benony K. Kortatsi
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  2. Collins K. Tay
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  3. Geophrey Anornu
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  4. Ebenezer Hayford
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  5. Grace A. Dartey
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Correspondence to Benony K. Kortatsi.

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Kortatsi, B.K., Tay, C.K., Anornu, G. et al. Hydrogeochemical evaluation of groundwater in the lower Offin basin, Ghana. Environ Geol 53, 1651–1662 (2008). https://doi.org/10.1007/s00254-007-0772-0

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  • DOI: https://doi.org/10.1007/s00254-007-0772-0

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