Abstract
Seasonal variation of physico-chemical variables of Oguta Lake, Nigeria was studied. Results obtained using standard analytical methods indicated that in the rainy and dry seasons (July and August) and (October and November), 2014, iron (Fe; 1.401 mg/l in November) was the overall metal observed in the lake, while mercury (Hg) was not detected throughout the period of study. Heavy metals concentrations observed were higher (not significantly) during the dry than the rainy season. The values observed for dissolved oxygen (DO), biological and chemical oxygen demand (BOD and COD) were within WHO permissible limits. The above evidence revealed that there was signs of heavy metal (Fe) pollution of the lake, and steps must be taking for constant monitoring of anthropogenic inputs into the lake.
Highlights
Lakes and rivers are abundant natural resourses of water
Biological oxygen demand (BOD), chemical oxygen demand (COD), were all determined by method as described by Franson (30)
It was observed that Fe (0.805mg/l) was the highest heavy metals (HMs) in the water sample observed in August, while Fe (0.906mg/l) was the highest HMs observed in the water in July
Summary
Lakes and rivers are abundant natural resourses of water. Water is necessary to sustain the system. Both urban and rural populations depend on lakes and rivers for their sources of water. The quality of these water bodies is not guaranteed due to contamination by heavy metals (HMs). Heavy metals pollution of lakes and river environments have been researched extensively by scientist all over the world. Heavy metals are mostly toxic, resistant to decomposition, and have the ability to bioaccumulate and affect the ecosystem adversely. There is need to always monitor environment systems where these metals are present
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