Distribution and Specific Bioaccumulation of Butyltin Compounds in a Marine Ecosystem
Distribution and Specific Bioaccumulation of Butyltin Compounds in a Marine Ecosystem
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丁基锡化合物在海洋生态系统中的分布和特定生物累积性
DOI：
10.1007/s002449900489
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发表时间：
1999
影响因子：
4
通讯作者：
N. Miyazaki
中科院分区：
文献类型：
--
作者：
S. Takahashi;S. Tanabe;I. Takeuchi;N. Miyazaki
为了解丁基锡在日本大池湾自然海洋生态系统中的分布和生物积累，对三丁基锡（TBT）及其分解产物二丁基锡（DBT）和单丁基锡（MBT）等丁基锡化合物进行了测定。在分析的所有隔间中都检测到BT残留，尽管它们的浓度似乎低于污染区域。大槌港附近海域海水中bt的浓度较高，表明该港口的海上活动是该海湾bt的主要来源。在20世纪80年代估计深度的沉积物岩心中发现了一个特定的BT残留水平峰值。不同深度岩心中bt的组成变化不大，说明这些化合物在沉积物中的降解速率较慢。浮游生物和其他生物中bt的积累量是海水的7万倍。然而，在食物链中没有观察到相当大的生物放大效应。在小鳞鱼和较小的鱼类中发现了相对较高的浓度。这些生物积累的TBT是BT衍生物中的优势化合物，其TBT的生物富集因子高于目前报道的其他物种。我们的研究结果表明，食物链中的某些生物可能具有较低的降解TBT的能力，因此可能积累较高水平的bt。
Butyltin compounds (BTs), including tributyltin (TBT) and its breakdown products, di- (DBT) and monobutyltin (MBT), were determined in sea water, sediment, and biota at various trophic levels in the food chain collected from Otsuchi Bay, Japan, for understanding distribution and bioaccumulation of BTs in natural marine ecosystems. BT residues were detected in all the compartments analyzed, although their concentrations appeared to be less than those in polluted areas. Concentrations of BTs in sea water were higher in locations near Otsuchi Port, indicating that maritime activities in the harbor has been a major source of BTs in this bay. A specific peak in BT residue levels was found in sediment cores at an estimated depth that dated to be from the 1980s. Lack of significant variation in the composition of BTs at different depths of cores suggests slow degradation rate of these compounds in sediments. BTs were accumulated in plankton and other organisms up to ∼70,000 times higher than in sea water. However, no considerable biomagnification was observed for BTs through the food chain. Relatively high concentrations were found in caprellids and smaller fish, such as gunnels. These organisms accumulated TBT as the predominant compound among BT derivatives and showed higher bioconcentration factors for TBT than in other species reported so far. Our results suggest that certain organisms in the food chain may have a less capacity to degrade TBT, and therefore may accumulate BTs at elevated levels.