Abstract
Organisms inhabiting in water require little amount of trace elements. At finest level they are favorable and further than that edge it affected fatal to the ecosystem. Continuous dumping of impurities like heavy metals from various supplies in significant quantities are constantly discharged into the rivers reaches estuaries and oceans. For the reason of this unwanted human liberation oceanic biosphere is recognized to hold heaviness of heavy metals. For most of the heavy metals estuarine sediments form the ultimate catch. The metals entering the system through various sources may associate with the sediment particles either by absorption are gradually sink with sediment or they may get released when mixed with marine water due to altered physico-chemical environment. Veli Lake is polluted by different means which is situated in the south west coast of India (Kerala). The additional quantities of heavy metals come from agricultural, industrial and domestic wastes. Hence sediments are indicators of the quality of overlying water, for the present study five different heavy metals were analyzed from the sediments of Veli Lake. Monthly collection of sediments and analysis were carried out for a period of one year (April-2017 to March-2018). The five metals analyzed were copper, lead, manganese, nickel and zinc. Low levels of copper were observed in all the stations while comparing other metals. The seasonal variations were also noted for all the five metals and discussed.
Highlights
Pollution of an aquatic system in general is classified into two, one type is pollution by the poisonous substances like heavy metals or pesticides and the other type is pollution by the nutrients or organic materials
The copper content of station1 ranged from 8.1μg/g in July to 15.1μg/g in November with the mean value of 12.02μg/g
A biologically important and widely distributed metal occurring in low concentrations is copper [9]
Summary
Pollution of an aquatic system in general is classified into two, one type is pollution by the poisonous substances like heavy metals or pesticides and the other type is pollution by the nutrients or organic materials. The former is responsible for the toxic effect. The sediments showed wide geographic variability in their metal content, complexion, sorption and biochemical transformation [2]. Heavy metals are potentially hazardous in estuaries and near shore water [3]. Many aquatic organisms are known to accumulate and concentrate metal at relatively higher concentration than the surrounding environment [5]
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