Recent DDT and PCB contamination in the sediment and biota of the Como Bay (Lake Como, Italy)
Recent DDT and PCB contamination in the sediment and biota of the Como Bay (Lake Como, Italy)
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DOI：
10.1016/j.scitotenv.2015.10.099
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发表时间：
2016-01-15
影响因子：
9.8
通讯作者：
Galassi, S.
中科院分区：
文献类型：
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作者：
Bettinetti, R.;Quadroni, S.;Galassi, S.
由于其独特的地理和形态特征，科莫湖（意大利北部）代表了一个有趣的研究案例，用于调查持久性有机污染物（POP）的次流域规模循环，尽管这些污染物自 20 世纪 70 年代以来就被禁止，但由于近年来冰川融化而在一些南部高山湖泊中达到了令人惊讶的高浓度。尤其是位于科莫市的科莫湾似乎值得注意，因为其水域的停留时间比湖中其他区域更长。对科莫湾沉积物岩芯中 PCB、pp'DDT 及其代谢物历史浓度的分析（涵盖从禁令到近期的一段时间内）表明，随着时间的推移，DDT 从未经历过显着 (p < 0.05) 下降，最丰富的同系物 pp'DDE 的浓度范围为 27 至 75 ng g(-1) D.W。相反，近年来 PCB 显着下降 (p < 0.05)，浓度达到 80 ng g-1 d.w 左右。高海拔和当地来源的贡献也记录在食物网中：浮游动物和食浮游动物鱼类主要受到 pp'DDE（分别为 81.4 ng g(-1) w.w. 和 534.6 ng g(-1) w.w.）和多氯联苯代谢物 hexa-CB（449.7 ng g(-1) w.w. 和 1672.1 ng w.w.）的污染。 g(-1) w.w. 分别）。 agone 中的 DDT 浓度（2006-2009 年采样）从未超过意大利人类消费限值，而在一份分析的鱼样品中，六种选定 PCB 的浓度超过了人类健康咨询建议，大约是建议值 125 ng g(-1) w.w 的两倍。 (C) 2015 Elsevier B.V. 保留所有权利。
Due to its peculiar geographical and morphological characteristics, Lake Como (Northern Italy) represents an interesting study-case for investigating the sub-basin scale circulation of persistent organic pollutants (POPs) that, despite being banned since the 1970s, have reached surprisingly high concentrations in some southern alpine lakes as a consequence of their release from melting glaciers in recent years. In particular, the Como Bay, which is located in the city of Como, seems noteworthy because its waters have a longer residence time than the other areas of the lake. The analyses of the historical concentration of PCBs, pp'DDT and its metabolites in a sediment core sampled from the Como Bay covering a time-period from their ban to recent times, showed that the DDTs have never experienced a significant (p < 0.05) decrease over time, with concentrations of the most abundant homologue, pp'DDE, ranging from 27 to 75 ng g(-1) d.w. Conversely PCBs significantly (p < 0.05) decreased towards recent times, reaching concentrations around 80 ng g-1 d.w. The contribution of high altitude and local sources was recorded also in the food web: both zooplankton and the zooplanktivorous fish agone were mainly contaminated by pp'DDE (81.4 ng g(-1) w.w. and 534.6 ng g(-1) w.w. respectively) and by the PCB metabolite hexa-CB (449.7 ng g(-1) w.w. and 1672.1 ng g(-1) w.w. respectively). The DDT concentrations in the agone (sampled during the years 2006-2009) never exceeded the limits for human consumption in Italy, while concentrations of six selected PCBs exceeded human health advisory recommendations in one of the fish samples analysed, when it was approximately two times higher than the recommended value of 125 ng g(-1) w.w. (C) 2015 Elsevier B.V. All rights reserved.