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首页> 外文期刊>Aquatic Sciences >Persistent organic pollutants in remote freshwater ecosystems
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Persistent organic pollutants in remote freshwater ecosystems

机译：偏远淡水生态系统中的持久性有机污染物

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Persistent organic pollutants (POPs), including organochlorine compounds (OCs) and polycyclic aromatic hydrocarbons (PAHs) were measured in two European remote mountain lakes situated in the Pyrenees (Lake Redon) and the Tatra Mountains (Ladove). Both dissolved and particulate water phases were analyzed at different water column depths. OCs already banned in most European countries showed similar concentrations in the two lakes, e.g. 6.7-8.5 pg L~(-1) for HCB, 8.0-12 pg L~(-1) for DDTs, and 60-64 pg L~(-1) for PCBs (sum of seven individual congeners), being in general lower than those reported in other remote aquatic systems. On the contrary, compounds of present use or currently emitted to the atmosphere exhibited significant concentration differences between sites. Thus, the higher levels of HCHs (1000-2630 pg L~(-1)) and endosulfans (780-1610 pg L~(-1)) in Lake Redon than in Ladove are in agreement with an impact of agricultural activities in the former. In contrast, the higher PAH concentrations in Ladove, 12 ± 1 ng L~(-1) (mean ± standard deviation), than in Lake Redon, 0.77-1.6 ng L~(-1) evidence higher deposition of combustion residues in the Tatras. POP concentration decreases with depth were observed for the compounds present in the dissolved phase such as endosulfan, HCB, and the low molecular weight PCBs and PAH. The vertical differences were higher in Lake Redon, probably due to its deeper basin. These gradients are consistent with the incorporation of these compounds into the lakes by air-water exchange through the gas-dissolved phase. In contrast, PCBs or PAH associated to the suspended particulate material (those of higher molecular weight) showed uniform concentrations throughout the water column, which may reflect high efficiency in the vertical transport of the compounds associated to this phase.
机译：在位于比利牛斯山（雷东湖）和塔特拉山（拉多夫）的两个欧洲偏远山区湖泊中测量了持久性有机污染物（POPs），包括有机氯化合物（OCs）和多环芳烃（PAHs）。在不同的水柱深度下分析了溶解水相和颗粒水相。大多数欧洲国家已经禁止使用的OC在两个湖泊中的浓度相似，例如六氯苯（HCB）为6.7-8.5 pg L〜（-1），滴滴涕为8.0-12 pg L〜（-1），而多氯联苯（七个独立同类物的总和）为60-64 pg L〜（-1）低于其他偏远水生系统的报告。相反，目前使用或当前排放到大气中的化合物在位点之间表现出明显的浓度差异。因此，雷登湖中六氯环己烷（1000-2630 pg L〜（-1））和硫丹（780-1610 pg L〜（-1））的水平高于拉多夫，这与该地区农业活动的影响是一致的。前任的。相比之下，拉多夫的PAH浓度较高，为12±1 ng L〜（-1）（均值±标准偏差），而雷东湖的PAH浓度为0.77-1.6 ng L〜（-1），表明燃烧残渣在燃烧室中的沉积较高。塔特拉山。对于溶解相中存在的化合物，例如硫丹，六氯代苯，低分子量多氯联苯和多环芳烃，POP浓度随深度而降低。雷东湖的垂直差异较高，这可能是由于其盆地较深所致。这些梯度与通过气体溶解相通过空气-水交换将这些化合物掺入湖泊一致。相反，与悬浮颗粒材料（分子量较高的那些）相关的PCB或PAH在整个水柱中显示出均匀的浓度，这可能反映了与此相相关的化合物在垂直运输中的高效率。

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