Heavy metals are widespiead pollutants of great environmental concern as they are non degradable, toxic and persistent.with serious ecological ramifications on aquatic ecology. The objective of this study is to analyse the spatio-temporal variation of heavy metals in the sediments of a lake system (Akkulam-Veli lake, Kerala). Correlation analysis .has been conducted to determine the factors that influence the accumulation of heavy metals. High cadmium content is observed during premonsoon (PRM) due to the reduction in salinity in the lake water and is absent during postmonsoon (POM) due to increase in salinity and. dissolved oxygen. A hike in lead content can be observed during monsoon (MON). Heavy metal concentration is high during monsoon due to urban runoff. Heavy metals are accumulated in clay during PRM. During MON and POM, heavy metals found accumulated in silt fraction of sediment.
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