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ABSTRACT
The importance of good water quality to environmental and human health cannot be over-emphasised. However, water quality around the world is threatened due to inputs of contaminants such as nutrients and heavy metals, especially from anthropogenic sources. This study was carried out to ascertain the physicochemical properties and manganese content of water and sediments taken from Ikpoba and Ogba Rivers in Benin City, Nigeria. Sampling was done from November 2021 to January 2022 and all samples were analysed following standard procedures. The results obtained from the study showed that manganese concentrations in the water (0.04 - 0.057mg/l) and sediments (11.59 - 16.35mg/kg) were within the safe limits recommended by the WHO, indicating absence of manganese contamination in both rivers. The values for the physicochemical properties of the water samples were also within the permissible limits as recommended by the WHO. However, pH (5.7 - 6.6) and dissolved oxygen (2.73 - 6.32mg/l) fell outside these limits for both rivers. The results from the study also showed observed trends in the results of the various parameters determined by the seasons. Statistical analysis revealed the absence of significant differences (p < 0.05) between the physicochemical and heavy metal content of water and sediments for both rivers. It was then recommended that periodic monitoring and assessment of water and sediments in the study area be carried out.
