ABSTRACT
ABSTRACT: The hydrogeochemistry of parts of two tectonic terrains, the Obudu plateau and Benue trough were studied during a dry season period (November 2002, December 2002, and January 2003). This was to determine the process controlling the water chemistry and to assess the quality of water. The results show that, based on ionic ratios, precipitation and water-rock interaction (silicate weathering) are the main controlling factors contributing to solute concentration in these areas. The main water types in the area include Ca Na HCO3 Cl, Ca Na HCO3, Na HCO3 Cl, and Na Cl. Most of the parameters considered are below international acceptable limits for drinking, domestic and irrigation purposes. However, iron and manganese seems to be a problem with concentrations above the recommended limits. Using Sodium Absorption ratio (SAR), percent sodium (% Na) and residual sodium carbonate (RSC) as criteria, the waters appear suitable for irrigation purposes. During the dry season the water quality deteriorates.
