title: Metal speciation in sediment and their bioaccumulation in fish species of three urban rivers in Bangladesh.
abstract: Six trace metals (chromium [Cr], nickel [Ni], copper [Cu], arsenic [As], cadmium [Cd] and lead [Pb]) were measured in sediments and soft tissues of three commonly consumed fish species (Channa punctatus, Heteropneustes fossilis, and Trichogaster fasciata) collected from three urban rivers around Dhaka City, Bangladesh. The abundance of total metals in sediments varied in the decreasing order of Cr > Ni > Pb > Cu > As > Cd. Sequential extraction tests showed that the studied metals were predominantly associated with the residual fraction followed by the organically bound phase. The range of metal concentration in fish species were as follows: Cr (0.75-4.8), Ni (0.14-3.1), Cu (1.1-7.2), As (0.091-0.53), Cd (0.008-0.13), and Pb (0.052-2.7 mg/kg wet weight [ww]). The rank of biota-sediment accumulation factor for fish species were in the descending order of Cu > As > Pb > Ni > Cr > Cd. Metal concentrations in fish exceeded the international permissible standards suggesting that these species are not safe for human consumption.
authors.affiliation: Faculty and Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa, 240-8501, Japan, msaifulpstu@yahoo.com.
authors.forename: Md Saiful
authors.initials: MS
authors.lastname: Islam
authors.forename: Md Kawser
authors.initials: MK
authors.lastname: Ahmed
authors.forename: Mohammad
authors.initials: M
authors.lastname: Raknuzzaman
authors.forename: Md
authors.initials: M
authors.lastname: Habibullah-Al-Mamun
authors.forename: Shigeki
authors.initials: S
authors.lastname: Masunaga
mesh_terms: D000818:Animals; D001459:Bangladesh; D004784:Environmental Monitoring; D005399:Fishes / Q000378:metabolism*; D019015:Geologic Sediments / Q000737:chemistry; D008670:Metals / Q000032:analysis* / Q000378:metabolism; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical