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Organotins in the aquatic media of secondary anabranches in the Three Gorges Reservoir Region, China

机译：中国三峡库区次生水成林中水体中的有机锡

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The Three Gorges Reservoir Region (TGRR) is one of the most sensitive areas of ecological environment in China. As vital backwater areas, the secondary anabranches of the TGRR were prone to eutrophication in Spring which would affect the distribution and transfer of organotins (OTs) among aquatic media. This study quantified the concentrations of butyltins (BTs) and phenyltins (PhTs) in water columns and aquatic media of two anabranches of the TGRR, the Daning River (DR) and the Xiaojiang River (XR) during the state of eutrophication. Our results showed that the average concentrations of BTs and PhTs in surface water are 43.91, 81.25 ng Sn L-1 in the DR, and 63.49, 69.21 ng Sn L-1 in the XR, respectively, and there were no obvious differences in the concentrations of BTs and PhTs across the water columns in the DR and XR. PhTs, especially monophenyltin (MPhT), are predominated in the dissolved phase, whereas BTs, especially dibutyltin (DBT), are predominated in both suspended particulate matter (SPM) and the sediment. Shipping and agricultural activity were likely the sources of OTs in both the DR and XR. High concentrations of tributyltin (TBT) and triphenyltin (TPhT) are still present in the aquatic media of the TGRR, and pose a significant risk to aquatic organisms due to the potential for bioaccumulation. Therefore, it is necessary to further monitor and assess OTs especially PhTs in surface water, and to continue to restrict the use of OTs to protect the aquatic environment of the TGRR. (C) 2018 Elsevier Ltd. All rights reserved.
机译：三峡库区（TGRR）是中国生态环境最敏感的地区之一。作为重要的回水区，TGRR的次要分支在春季容易发生富营养化，这将影响有机锡在水生介质中的分布和转移。这项研究量化了富营养化状态下TGRR的两个支流，大宁河（DR）和小江（XR）的水柱和水介质中丁基锡（BTs）和苯基锡（PhTs）的浓度。结果表明，DR中地表水中BTs和PhTs的平均浓度分别为43.91、81.25 ng Sn L-1和XR中的平均浓度分别为63.49、69.21 ng Sn L-1。 DR和XR中整个水柱中BT和PhT的浓度。 PhTs，尤其是单苯基锡（MPhT）在溶解相中占主导地位，而BTs，尤其是二丁基锡（DBT）在悬浮颗粒物（SPM）和沉积物中都占主导地位。在DR和XR中，运输和农业活动很可能是OT的来源。 TGRR的水介质中仍存在高浓度的三丁基锡（TBT）和三苯基锡（TPhT），由于其潜在的生物蓄积性，对水生生物构成了重大风险。因此，有必要进一步监测和评估地表水中的OT，尤其是PhT，并继续限制OT的使用以保护TGRR的水生环境。 （C）2018 Elsevier Ltd.保留所有权利。

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