Characterization of the water chemistry sediment

Authors: Subrata Das Sharma D Sujatha

Publish Date: 2016/06/16

Volume: 188, Issue: 7, Pages: 409-

PDF Link

Abstract

The chemistry of surface water sampled at different locations of the Kolleru Lake in Andhra Pradesh India show heterogeneous variability The concentrations of dissolved sodium and chloride ions total dissolved solids TDS together with high conductivity documented in water samples are indicative of mixing of saline seawater This interpretation is further corroborated by enriched δ18O compositions of the carbonate fraction of the surface sediments collected at the same locations as that of water of the lake and fairly good positive correlations of δ18O –Na+ and δ18O–TDS The saline water intrusion into the lake appears to be resulted due to its near stagnant to dry condition with reduced inflow and outflow Such dry condition facilitated seawater intrusion into the lake due to several reasons i proximity of lake to the sea ~35 km ii overexploitation of fresh groundwater for agriculture as well as livestock farming and iii incursion of tidal seawater high sea waves through Upputeru River which is directly linked to the sea We also document highly heterogeneous distribution of certain potentially toxic metal ions like chromium copper manganese and zinc in the lake waters Indiscriminate disposal of domestic and industrial effluents around the lake appears to be responsible for the presence of potentially toxic heavy metals Based on these results we finally suggest some measures for environmental rehabilitation of the lake and its surroundingsThis work was carried out as part of the CSIRNGRI inhouse project MLP650928 to Das Sharma Enormous improvement of the quality of this presentation was possible because of some valuable and specific suggestions made by the Editor Dr Jose Alexander Elvir Associate Editor and two anonymous reviewers We are thankful to them

Keywords: