Department of Planetology and Habitability, Astrobiology Centre (INTA-CSIC) , Torrejón de Ardóz 28850, Madrid, Spain.
Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University , Stockholm 10691, Sweden.
Environ Sci Technol. 2017 Jul 18;51(14):7913-7919. doi: 10.1021/acs.est.7b01369. Epub 2017 Jul 10.
There is a scarcity of data on the amount and distribution of the organochlorine pesticide dichlorodiphenyltrichloroethane (DDT) and its metabolites in intermediate and deep ocean water masses. Here, the distribution and inventories of DDTs in water of the Arctic shelf seas and the interior basin are presented. The occurrence of ∑DDT (0.10-66 pg L) in the surface water was dominated by 4,4'-DDE. In the Central Arctic Ocean increasing concentrations of DDE with depth were observed in the Makarov and Amundsen basins. The increasing concentrations down to 2500 m depth is in accordance with previous findings for PCBs and PBDEs. Similar concentrations of DDT and DDEs were found in the surface water, while the relative contribution of DDEs increased with depth, demonstrating a transformation over time and depth. Higher concentrations of DDTs were found in the European part of the Arctic Ocean; these distributions likely reflect a combination of different usage patterns, transport, and fate of these compounds. For instance, the elevated concentrations of DDTs in the Barents and Atlantic sectors of the Arctic Ocean indicate the northbound Atlantic current as a significant conveyor of DDTs. This study contributes to the very rare data on OCPs in the vast deep-water compartments and combined with surface water distribution across the Arctic Ocean helps to improve our understanding of the large-scale fate of DDTs in the Arctic.
关于有机氯农药滴滴涕（DDT）及其代谢物在中深层海洋水体中的含量和分布，数据十分匮乏。本研究呈现了北冰洋陆架海和内部盆地水中 DDTs 的分布和存量。∑DDT（0.10-66 pg L）在表层水中的存在主要由 4,4'-DDE 决定。在中央北冰洋，马卡罗夫和阿蒙森盆地的 DDE 浓度随深度增加。这种在 2500 m 深度以下的浓度增加与以前对多氯联苯（PCBs）和多溴二苯醚（PBDEs）的发现一致。在表层水中发现了相似浓度的 DDT 和 DDEs，而 DDEs 的相对贡献随深度增加，表明随着时间和深度的变化发生了转化。在北冰洋的欧洲部分发现了更高浓度的 DDTs；这些分布可能反映了这些化合物不同的使用模式、传输和归宿的综合作用。例如，在北冰洋的巴伦支海和大西洋海域 DDTs 浓度升高表明北大西洋暖流是 DDTs 的重要输送者。本研究为在广阔的深层水隔室中 OCPs 的罕见数据做出了贡献，并与北冰洋的表层水分布相结合，有助于提高我们对 DDTs 在北极的大尺度归宿的理解。
