title: Linkage between speciation of Cd in mangrove sediment and its bioaccumulation in total soft tissue of oyster from the west coast of India.
abstract: This study established a mechanistic linkage between Cd speciation and bioavailability in mangrove system from the west coast of India. High bioaccumulation of Cd was found in the oyster (Crassostrea sp.) even at low Cd loading in the bottom sediment. Bioaccumulation of Cd in the oyster gradually increased with the increasing concentrations of water soluble, exchangeable and carbonate/bicarbonate forms of Cd in the sediments. Fe/Mn oxyhydroxide phase was found to control Cd bioavailability in the sediment system. Cd-associated with sedimentary organic matter was bioavailable and organic ligands in the sediments were poor chelating agents for Cd. This study suggests that bioaccumulation of Cd in oyster (Crassostrea sp.) depends not on the total Cd concentration but on the speciation of Cd in the system.
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India. Electronic address: pchak@nio.org.
authors.forename: Parthasarathi
authors.initials: P
authors.lastname: Chakraborty
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India.
authors.forename: Darwin
authors.initials: D
authors.lastname: Ramteke
authors.affiliation: Carmel College of Arts, Science & Commerce for Women, Nuvem, Goa 403604, India.
authors.forename: Subhadra Devi
authors.initials: SD
authors.lastname: Gadi
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India.
authors.forename: Pratirupa
authors.initials: P
authors.lastname: Bardhan
mesh_terms: D000818:Animals; D001682:Biological Availability; D002104:Cadmium / Q000032:analysis* / Q000493:pharmacokinetics; D049896:Crassostrea / Q000737:chemistry* / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods*; D005506:Food Contamination / Q000032:analysis; D019015:Geologic Sediments / Q000737:chemistry*; D007194:India; D012758:Shellfish / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Cd in Crassostrea sp.; Cd-accumulation; Cd-bioavailability; Cd-speciation; Sequential extraction study