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Assessment of the Physico-chemical water quality of an Artificial Lake in Osun State, Nigeria, over time and space

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Author Affiliations

  • 1Anchor University, Ayobo-Ipaja, Ayobo, Lagos, Nigeria and Obafemi Awolowo University, Ile-Ife, Nigeria
  • 2Obafemi Awolowo University, Ile-Ife, Nigeria
  • 3Obafemi Awolowo University, Ile-Ife, Nigeria

Int. Res. J. Environment Sci., Volume 11, Issue (2), Pages 13-24, April,22 (2022)

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 mercury-in-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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