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首页> 外文期刊>Environmental Science & Technology >Particle-Water Partitioning of PCBs in the Photic Zone: A 25-Month Study in the Open Baltic Sea
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Particle-Water Partitioning of PCBs in the Photic Zone: A 25-Month Study in the Open Baltic Sea

机译：多氯联苯在水合区中的颗粒-水分配：在波罗的海的25个月研究

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From previous laboratory and field studies, it remains unclear whether partitioning of hydrophobic organic contaminants (HOCs) to phytoplankton from water is kinetically limited or may be treated as an equilibrium process. Here, we report on the partitioning of polychlorinated biphenyls (PCBs) to paniculate organic carbon (POC), dominated by planktonic primary production, in the open Baltic Sea during a 25-month period. The organic carbon-normalized partition coefficient (K{sub}(oc)) was corrected for temperature, salinity, and sorption to filter-passing organic carbon. At all 21 sampling occasions, the log K{sub}(oc)-log K{sub}(ow) regression was significantly linear, despite a large variation in biogeochemical parameters such as POC concentration and composition, primary production, and phytoplankton species composition. These data strongly suggest that partitioning of PCBsto POC intemperate surface waters is equilibrated and therefore not kinetically limited by factors such as rapid phytoplankton growth rate or large cell size. The partitioning of PCBs to the POC was described throughout seasonal cycles by log K{sub}(oc) = 0.88±0.07 log K{sub}(ow) + 0.90±0.47 (95% confidence interval). The slope of the log K{sub}(oc)-log K{sub}(ow) regression for the single sampling occasions varied between 0.56 and 1.25, and there was a seasonal variation in the POC sorbent quality (e.g., log K{sub}(oc) for PCB 28 varied between 5.5 and 6.9; median 5.9). These variations reflect the variability in structural composition of the POC pool in such pelagic waters. Being able to predict particle-water partitioning of HOCs significantly reduces the required complexity of both food web uptake models and predictions of POC-mediated export of HOCs to the deep ocean.
机译：从先前的实验室和现场研究中，尚不清楚疏水性有机污染物（HOC）从水中到浮游植物的分配在动力学上受到限制还是可以视为平衡过程。在这里，我们报告了在开放的波罗的海地区，在25个月的时间内，多氯联苯（PCB）分配成颗粒状有机碳（POC）的情况，该有机碳以浮游生物的初级生产为主。校正了有机碳归一化的分配系数（K {sub}（oc））的温度，盐度和对通过过滤器的有机碳的吸附。在所有21个采样时刻，尽管生物地球化学参数（如POC浓度和组成，初级生产和浮游植物物种组成）差异很大，但log K {sub}（oc）-log K {sub}（ow）回归显着线性。 。这些数据有力地表明，PCB到POC的分配使温带的地表水平衡，因此不受动力学因素的限制，例如浮游植物的快速生长速度或大细胞大小。在整个季节周期中，PCB对POC的分区由log K {sub}（oc）= 0.88±0.07 log K {sub}（ow）+ 0.90±0.47（95％置信区间）描述。单次采样的log K {sub}（oc）-log K {sub}（ow）回归的斜率在0.56和1.25之间变化，并且POC吸附剂质量存在季节性变化（例如，log K { PCB 28的sub}（oc）在5.5到6.9之间变化；中位数5.9）。这些变化反映了这种中上层水域POC池结构组成的变化。能够预测HOC的颗粒-水分配可以显着降低食物网摄取模型和POC介导的HOC向深海出口所需的复杂性。

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