Analysis of Heavy metals in water, sediments and fish samples of Madivala Lakes of Bangalore, Karnataka

Heavy metal (Pb, Cd, Cr, Ni ) concentration in water sediments and fish was analysed from Madivala lake in the month of June 2008. There was an appreciable increase in metal concentrations in going from the water to the sediment samples.The Heavy metal concentration, in water was in the order Pb > Cr > Cd > Ni , in sediments Pb > Cr > Cd > Ni. Ten fish species[Catla,Silver carp , Common carp, Tilapia(Oreochromis niloticus) Mrigal Etroplus suratensis, Murrels (Channa marulius), Nandus nandus Amblypharyngodon mola Catfishes (Heteropneustes fossilis) ] were collected from this lake and analyzed for Heavy metal content of muscle, liver, gills and kidney tissues. The maximum concentration of heavy metals was found in Kidney and liver, the order of heavy metal level in various argons is Muscle >Gills >liver >kidney. The Order of heavy metal concentration in Muscle Pb >Cd>Ni>Cr, in Gills Pb =Cd>Ni>Cr, in kidney Pb >>Cd>Ni>Cr and in liver Pb >Cd>Ni>Cr The presence of elevated levels of Pb and Cd in almost argons is a serious matter of concern and the potential for human exposure to heavy metals from eating fish caught in the lake.

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