Concentration of butyltin species in sediments associated with shipyard activity
Concentration of butyltin species in sediments associated with shipyard activity
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DOI：
10.1016/0269-7491(95)00046-1
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发表时间：
1996-01-01
影响因子：
8.9
通讯作者：
Lanphear, ME
中科院分区：
文献类型：
--
作者：
Page, DS;Ozbal, CC;Lanphear, ME
分析了1990年和1992年从波特兰和缅因州的布斯贝港潮间带采集的沉积物样品中的三丁基锡（TBT）和二丁基锡（DBT）。表层沉积物中三丁基锡化合物的浓度范围为24至12，400纳克/克（干重）。三丁基锡化合物浓度最高的沉积物与船厂船体清洗/修补活动有关。对岩芯样品中不同层的分析发现，在布斯贝场址，丁基锡浓度随深度而降低，在波特兰场址，丁基锡浓度随深度而保持相对恒定。洗脱液分析表明，可溶性三丁基锡化合物是从严重污染的沉积物中释放出来的。由此得出的海水中三丁基锡化合物浓度为1400纳克/升，低于报告的Tsr海水溶解度的0.03%，仅占沉积物样品中三丁基锡化合物总量的0.14%。这表明，所分析的沉积物中的三丁基锡化合物是以一种结合的基质形式存在的，如油漆颗粒，它会缓慢地释放生物杀灭剂。研究结果表明，在缅因州的某些地点，细沉积物的再悬浮有可能在未来释放三丁基锡化合物。
Tributyltin (TBT) and dibutyltin (DBT) were analyzed in sediment samples collected from intertidal locations in Portland and Boothbay Harbor, Maine (USA) in 1990 and 1992. Surface sediment TBT concentrations ranged from 24 to 12400 ng gm(-1) (dry wt basis). Sediments with the highest TBT concentrations were associated with shipyard hull washing/refinishing activities. Analysis of different layers in core samples found that butyltin concentrations decreased with depth at the Boothbay site and remained relatively constant with depth at the Portland site. Elutriate analysis showed that soluble TBT was released from a heavily contaminated sediment. The resulting TBT seawater concentration 1400 ng liter(-1) was < 0.03% of reported seawater solubilities of Tsr and was only 0.14% of the total TBT in the sediment sample. This suggests that the TBT in the sediments analyzed is in a bound matrix form, such as paint particles, that releases the biocide slowly. The results indicate that there is a potential for future release of TBT from the resuspension of fine sediments at certain locations in Maine.