title: Heavy metal partitioning in sediments and bioaccumulation in commercial fish species of three major reservoirs of river Cauvery delta region, India.
abstract: Chemical partitioning of heavy metals (Fe, Mn, Cu, Cr, Pb, Zn, Ni) were determined in surface sediments of three reservoirs at the Delta region of Cauvery River, India. The abundance of metals in sediments varied in the following descending order: Fe, Mn, Cr, Zn, Cu, Ni, and Pb. Higher concentrations of Zn, Pb, Fe, Mn and Cu in exchangeable and carbonate fraction indicated toxicity risk to the biota. Therefore, to understand the extent of bioaccumulation, six commercial fish species were collected from the same sites and analyzed for heavy metals distribution in different organs. Among the metals found in fish samples, iron was observed in the highest concentration, followed by Zn, Pb, Cr, Mn, Cu, and Ni. Concentrations of Pb, Cr and Zn in many fish samples exceeded the permissible limits of Food and Agriculture Organization. The concentrations of Pb (17.7-31.7%), Cr (6.2-15.1%), Cu (15.2-30.5%) and Zn (30-40%) associated with exchangeable and carbonate fractions had significant positive correlation with the respective metal concentrations in fish. Among the fish species, Catla catla and Etroplus suratensis showed the highest accumulation of metals suggesting risk for human consumption.
authors.affiliation: Department of Environmental Management, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India.
authors.forename: S
authors.initials: S
authors.lastname: Dhanakumar
authors.affiliation: Department of Environmental Management, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India.
authors.forename: G
authors.initials: G
authors.lastname: Solaraj
authors.affiliation: Department of Environmental Management, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India. Electronic address: mohan.bdu@gmail.com.
authors.forename: R
authors.initials: R
authors.lastname: Mohanraj
mesh_terms: D000818:Animals; D005399:Fishes / Q000378:metabolism*; D019015:Geologic Sediments / Q000737:chemistry*; D007194:India; D019216:Metals, Heavy / Q000032:analysis* / Q000378:metabolism; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical
keywords: Bioaccumulation; Fish species; Heavy metal partitioning; Reservoir sediments; Risk assessment