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ABSTRACT
Surface water bodies are known recipients of pollutants from various natural and anthropogenic sources. These pollutants are able to alter the chemical, physical and biological properties of these water bodies and affect the usability of water from these sources. The aim of this present study was to evaluate and compare the physicochemical properties and content of lead in water and sediment samples obtained from Ogba and Ikpoba rivers in Benin City, Nigeria. Standard analytical procedures were employed in the determination of the physicochemical parameters and lead concentrations. The results of the study showed that the concentrations of the following physicochemical parameters for water were within the World Health Organization limits: electrical conductivity, suspended solids, turbidity, chloride, calcium, magnesium, phosphate, sulphate, ammonium-N, biochemical oxygen demand and nitrate. On the Other hand, the pH and dissolved oxygen levels of some water samples were not within the permissible limits. The minimum concentration of lead recorded during the study was 0.010mg/l from Ogba river in January and the maximum was 0.026mg/l from Ikpoba river in November. Generally, there was no significant difference between the physicochemical properties and lead content of the water and sediment samples from both rivers. The study revealed a decreasing trend in parameters as the dry season progressed. It could be inferred that the water from both rivers is safe for use and for the survival of aquatic life. However it is recommended that routine monitoring of the rivers be carried out to ensure the continued safety of the aquatic environment and protection of human health.
