Assessment of the Physico-chemical water quality of an Artificial Lake in Osun State, Nigeria, over time and space
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Date
2022-04
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International Science Community Association
Abstract
This study investigated the variation in physico-chemical water quality of the Esa-Odo Reservoir over space and timefrom
February 2017 to December 2018 at two months interval. To cover the whole reservoir zone, sampling points were chosen
horizontally and vertically at marked out stations. Depth, transparency (using Secchi disc) and temperature (using mercuryin-glass bulb thermometer) were determined on field. Other physical and chemical parameters were evaluated using
standard methods. The values obtainedrevealed Esa-Odo Reservoir as slightly buffered freshwater with cationic hierarchy of
Na >Ca > Mg > K and anion hierarchy of HCO3-> Cl->SO42-. Investigated physical parameters varied the most and were
significant for two parameters (True Color and Total suspended solid) spatially. While vertically highly significant variation
were observed for four (Temperature, Turbidity, Total suspended solid, apparent and true color) parameters. Seasonally, five
of the investigated physical parameters (Turbidity, Total solid, Total suspended solid, apparent and true color) showed very
highly significant variation. However, in terms of the chemical parameters investigated, only the salinity parameters showed
significant vertical (pH and TDS) and highly significant seasonal (TDS, Alkalinity and Hardness) variations. Moreover,
seasonally, the nutrient parameters recorded highly significant variation as well as all ions assessed except potassium. All
monitored physico-chemical parameters were within the guide level range as of the World Health Organisation (WHO) for
drinking water, therefore Esa odo Reservoir water can be classified as fairly clean, alkaline freshwater. However based on
the significant seasonal variations in its water quality, regular proper monitoring of the reservoir is recommended.
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Helen Yetunde OMOBOYE, Adebukola Adenike ADEDEJI and Israel Funso ADENIYI. Assessment of the Physico-chemical water quality of an Artificial Lake in Osun State, Nigeria, over time and space. Int. Res. J. Environmental Sci., Vol. 11(2), 13-24, April (2022)