Spatial distribution and temporal trends of butyltin compounds (TBT, DBT & MBT) in short sediment cores of the SW Portuguese Shelf (western Iberian Margin, NE Atlantic)
Spatial distribution and temporal trends of butyltin compounds (TBT, DBT & MBT) in short sediment cores of the SW Portuguese Shelf (western Iberian Margin, NE Atlantic)
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DOI：
10.1016/j.scitotenv.2023.165872
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发表时间：
2023-08-02
影响因子：
9.8
通讯作者：
Caetano, Miguel
中科院分区：
文献类型：
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作者：
Mil-Homens, Mario;Almeida, C. Marisa R.;Caetano, Miguel
空间格局和时间趋势的丁基锡化合物三丁基锡（TBT），二丁基锡（DBT），单丁基锡（MBT）进行了调查，在一组沉积物样品收集沿着西南葡萄牙大陆架。在2012年进行的第一次评估中，该地区没有达到海洋战略框架指令（MSFD）规定的良好环境状态（GES）。总体而言，MBT和DBT是检测到的主要有机锡物种，但在塔霍河和佐渡河口的航道、港口和造船厂设施疏浚产生的疏浚污泥处置场及其周围发现了高浓度的三丁基锡化合物。尽管葡萄牙关于监测疏浚活动沉积物质量的法规仅考虑多环芳烃、多氯联苯和六氯代苯，但这些法规还规定，如果怀疑存在高值，则应监测其他有机污染物，如丁基锡化合物，但没有为这些污染物规定行动限值（海洋和海洋技术研究报告，2007年）。如果没有行动限制，条例中提出的监测建议就无法付诸实施。考虑到其毒性，BT衍生物应纳入立法，因为它们在疏浚物的重新定位中构成环境威胁，特别是当来自港口和造船厂地区时。基于这项研究，我们建议更多地关注疏浚物处置场（DMDS）及其周围环境沉积物中BT的含量和影响。或者更好的办法是，为了提高效率，应在疏浚物的源头而不是在汇点进行监测。如果不这样做，则必须在葡萄牙所有接收轻度至重度污染疏浚物的疏浚物处置地点开展沉积物和生物体中三丁基锡化合物（和其他三丁基锡化合物）浓度的监测，包括性畸变研究。
Spatial patterns and temporal trends of the butyltin compounds tributyltin (TBT), dibutyltin (DBT), and mon-obutyltin (MBT) were investigated in a set of sediment samples collected along the SW Portuguese continental shelf. This region did not reach the Good Environmental Status (GES) in accordance with the Marine Strategy Framework Directive (MSFD) during a first evaluation carried out in 2012. Overall, MBT and DBT were the predominant organotin species detected, but high concentrations of TBT were found in and around disposal sites for dredge sludge derived from the dredging in navigation channels, harbours, and shipyard facilities of the Tagus and Sado estuaries. Although Portuguese regulations for monitoring sediment quality in relation to dredging activities consider only PAH, PCB and HCB, they also dictate that other organic contaminants such as butyltin compounds (BTs) should be monitored if suspicion of high values exists, but no action limits are defined for these (MAOTDR, 2007). Without action limits, the monitoring recommendation given in the regulations is not put into practice. Considering their toxicity, BT derivates should be integrated in the legislation, because they represent an environmental threat in the relocation of dredged material, especially when derived from harbour and shipyards areas. Based on this study, we recommend giving more attention to the amounts and impacts of BTs in sediments at dredged material disposal sites (DMDS) and their surroundings. Or even better, in order to be more efficient, monitoring should be done at the source of the dredged materials and not at the sink. In case it is not done, the monitoring of concentrations of TBT (and other BTs) in sediments and organisms, including imposex studies, at all Portuguese sites for disposal of dredged material receiving slightly to strongly contami-nated dredged material must be developed.