Islam Md Saiful, Ahmed Md Kawser, Raknuzzaman Mohammad, Habibullah-Al-Mamun Md, Masunaga Shigeki
Faculty and Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa, 240-8501, Japan,
Arch Environ Contam Toxicol. 2015 Jan;68(1):92-106. doi: 10.1007/s00244-014-0079-6. Epub 2014 Sep 12.
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.
对从孟加拉国达卡市周边三条城市河流采集的三种常见食用鱼类（斑鳢、胡鲶和三星斗鱼）的沉积物和软组织中的六种痕量金属（铬[Cr]、镍[Ni]、铜[Cu]、砷[As]、镉[Cd]和铅[Pb]）进行了测量。沉积物中总金属的丰度按Cr>Ni>Pb>Cu>As>Cd的降序排列。连续萃取试验表明，所研究的金属主要与残留部分相关，其次是有机结合相。鱼类中金属浓度范围如下：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）和Pb（0.052 - 2.7毫克/千克湿重[ww]）。鱼类的生物群 - 沉积物积累因子排名按Cu>As>Pb>Ni>Cr>Cd的降序排列。鱼类中的金属浓度超过了国际许可标准，表明这些物种对人类消费不安全。
