Spatial and Seasonal Concentration of Dissolved Nutrients in River Ethiope, Nigeria
Authors: Atedhor GO, Okelezo O
This study examined the variation of dissolved nutrients along River Ethiope, Delta State, Nigeria. Water samples were collected at the upper course (Umutu), middle course (Eku) and lower course (Sapele) during early, peak and late periods of the wet and dry seasons. Concentration of Ca2+, Mg2+, K+, Na+, NO3-, HCO3-1, Cl- and SO42- were analyzed. Findings reveal insignificant seasonal variations in the concentration of the nutrients at each of the stages and along the course of RE. Positive significant relationships were observed between Na+ and K+, SO42- and Na+ (P < 0.05) and SO42- and K+ (P < 0.01) at the upper course. At the middle course, positive significant relationships existed between NO3- and Ca2+, Ca2+ and Mg2+ (P < 0.05) and between HCO3-1 and Na+ (P < 0.01) while at the lower course, positive significant relationships were detected between Na+ and K+, NO3- and Ca2+, HCO3-1 and K+ as well as between HCO3-1 and Na+ (P < 0.05). At the lower course, positive significant relationships existed between SO42- and and K+, Na+ and HCO3-1. Highest and lowest concentrations of nutrients at the upper course were Cl -(81.35±14.17 mg/l) and SO42-(0.31±0.11 mg/l) respectively while highest and lowest concentrations at the middle course were Cl- (81.29±17.86 mg/l) and SO42- (0.29±0.09 mg/l) respectively whereas at the lower course, highest and the lowest concentrations were Cl- (72.63±18.17 mg/l) and NO3- (0.12±0.07 mg/l) respectively. The upper course largely witnessed the highest concentration of nutrients. Findings suggest similarities in the natural and anthropogenic sources of some of the nutrients at the catchment area of RE.
Affiliations: Department of Geography and Regional Planning, University of Benin, Benin City, Nigeria
Keywords: Dissolved Nutrients, Spatial Concentration, Seasonal Concentration, River Ethiope, Nigeria
Published date: 2020/06/30