Abstract
Ground water of the farm settlements in the bitumen deposit area of Western Nigeria were tested for pH, conductivity, turbidity, total dissolved solid, sulphate, phosphate, nitrogen nitrate, chloride, alkalinity, total hardness, calcium, magnesium, sodium, potassium and total coliform in the dry season (March) and rainy season (August) of years 2008 and 2009 using atomic absorption spectrometer and standard analytical methods. Conductivity, pH, turbidity, phosphate ions and total coliform values obtained in some of the wells were out of the recommended range for drinking water. Water quality index analysis was carried out using information entropy method. Water quality index of the wells when compared with the permissible limits of international standards, ranked the bore hole as ‘excellent’ in the dry season of year 2009 and just ‘good’ in the rainy season of the same year. Ground water sampling stations were ranked extremely poor at least once out of the four seasons considered. Water quality index ranking also showed that the quality of the wells declined over the years. The correlation coefficient matrix (p < 0.05) of water quality index and the parameters showed significant relationships between water quality index and total coliform (0.99), total dissolved solids and conductivity (0.96), hardness and Ca2+ (0.68), hardness and Mg2+ (0.75). Water quality index also showed moderate significant relationship with total dissolved solid, conductivity and N–NO3 −. High concentration of total coliform in most of the shallow wells in the environment, due to bitumen deposit, renders them unfit for human consumption unless properly treated.
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The authors which to express their gratitude to the Department of Chemistry, University of Ado-Ekiti, Ado-Ekiti, Nigeria and the management of the University of Ado-Ekiti, Nigeria, for their support.
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Fagbote, E.O., Olanipekun, E.O. & Uyi, H.S. Water quality index of the ground water of bitumen deposit impacted farm settlements using entropy weighted method. Int. J. Environ. Sci. Technol. 11, 127–138 (2014). https://doi.org/10.1007/s13762-012-0149-0
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DOI: https://doi.org/10.1007/s13762-012-0149-0