On the relative significance of bacteria for the distribution of polychlorinated biphenyls in Arctic Ocean surface waters.
On the relative significance of bacteria for the distribution of polychlorinated biphenyls in Arctic Ocean surface waters.
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DOI：
10.1021/es0524907
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发表时间：
2006-03
影响因子：
11.4
通讯作者：
Anna Sobek;K. Olli;O. Gustafsson
中科院分区：
文献类型：
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作者：
Anna Sobek;K. Olli;O. Gustafsson
本研究首次对海洋沃茨中细菌体内的多氯联苯（PCB）进行了现场观测。为了增进对细菌在表层海水中疏水性有机污染物动态中所起作用的有限了解，对在北方巴伦支海边缘冰区和北冰洋中部的七个站点收集的细菌（0.2-2微米）中的多氯联苯浓度进行了测量。细菌中的多氯联苯同系物浓度为0.5-5纳克/克oc（有机碳），与多氯联苯在颗粒状有机碳（POC，“浮游植物”; > 0.7微米）中的浓度一样高或更高。考虑到浮游植物和细菌的相对生物量，细菌中PCB含量一般为浮游植物的5-20%，但有两个站位细菌生物量中PCB含量高于浮游植物。该研究进一步表明，细菌对PCB的有效吸收可用表观平衡分配模型来描述，该模型具有有机碳归一化分配系数和辛醇-水分配系数之间的线性回归（log K（bact-oc）-log K（ow））。
This study presents the first field observations of polychlorinated biphenyls (PCB) in bacteria in oceanic waters. To contribute to the limited knowledge of what role bacteria play in the dynamics of hydrophobic organic contaminants (HOCs) in surface seawater, PCB concentrations were measured in bacteria (0.2-2 microm) collected at seven stations in the northern Barents Sea marginal ice zone (MIZ) and the central Arctic Ocean. Concentrations of individual PCB congeners in bacteria were 0.5-5 ng/g oc (organic carbon), which was as high as or higher than PCB concentrations in bulk particulate organic carbon (POC, "phytoplankton"; > 0.7 microm). Considering the relative biomasses of phytoplankton and bacteria, the amount of PCB in bacteria was generally 5-20% of that in phytoplankton, but at two stations the bacterial biomass contained more PCBs than the phytoplankton pool. This study further showed that efficient PCB uptake in bacteria may be described by an apparent equilibrium partitioning model with linear regressions between the organic-carbon-normalized partition coefficient and the octanol-water partition coefficient (log K(bact-oc)-log K(ow)).