Association of polychlorinated biphenyls (PCBs) with live algae and total lipids in rivers - a field-based approach
Association of polychlorinated biphenyls (PCBs) with live algae and total lipids in rivers - a field-based approach
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DOI：
10.1016/j.scitotenv.2004.11.025
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发表时间：
2006-01-15
影响因子：
9.8
通讯作者：
Steuer, JJ
中科院分区：
文献类型：
--
作者：
Fitzgerald, SA;Steuer, JJ
协会的多氯联苯和活的藻类细胞在河流中进行了研究，在四个地点在四个季节在两个威斯康星州河流。颗粒相关的多氯联苯和叶绿素a和藻碳浓度之间的正相关关系表明，活藻细胞是一个重要的溶解多氯联苯的吸附阶段。大型羽状硅藻（舟形藻属、针杆藻属、羽状藻属、硅藻属和卵形藻属），或更罕见的裸藻（囊裸藻属），占主导地位的大多数样品组合的藻类碳的基础上。这些组合组成的最高百分比的总有机碳在春季（平均=50%）和最低在夏季（平均=15%）。在三个蓄水点，大多数单独的多氯联苯同源物在样品中相对富集，其特点是：（1）藻类碳浓度高（占有机碳的百分比），（2）藻类组合以裸藻为主（或共同为主），（3）总脂质浓度高。尽管大多数富含脂质的样本中吸附的PCB质量相对较高，但当汇总研究中的所有样本时，总脂质含量和颗粒相关PCB之间没有强相关性。一个可能的解释是，多氯联苯与其他结构组件在活藻类和（或）偏离化学平衡的河流，由于藻类生长动力学。一个动力学吸收模型被用来计算与活藻类的总有机碳含量的多氯联苯的质量。基于这个模型，多氯联苯富集在藻细胞在水华季节（春季和秋季）相比，非水华季节（夏季和冬季）。此外，虽然个别多氯联苯同系物分配系数（对数）活藻细胞（范围=5.3-6.4）重叠的碎屑（范围=3.6-7.4），多氯联苯往往是丰富的碎屑碳池在非水华条件。碎屑的多氯联苯分配系数估计值范围较大，这可能反映了与活藻类细胞相比，这种材料的异质性更大。由爱思唯尔公司出版
The association of PCBs and live algal cells in rivers was studied at four locations during four seasons in two Wisconsin rivers. Positive relations between particle-associated PCBs and both chlorophyll-a and algal carbon concentrations indicated that live algal cells were a significant sorption phase for dissolved PCBs. Large Pennate diatoms (Navicula, Synedra, Pinnularia, Diatoma, and Cocconeis), or more rarely, Euglenoids (Trachelomonas sp.), dominated most sample assemblages on an algal carbon basis. These assemblages made up the highest percentage of total SOC during spring (average=50%) and lowest during summer (average=15%). At the three impounded sites, most individual PCB congeners were relatively enriched in samples characterized by: (1) high concentrations of algal carbon (as a percent of SOC), (2) algal assemblages dominated (or co-dominated) by Euglenoids, and (3) high concentrations of total lipids. Despite relatively higher masses of sorbed PCBs in the most lipid-rich samples, there was no robust correlation between total lipid content and particle-associated PCBs when aggregating all samples from the study. A possible explanation is that PCBs are associated with other structural components in live algae and (or) departure from chemical equilibrium in the river due to algal growth kinetics. A kinetic uptake model was used to calculate the mass of PCBs associated with the total organic carbon content of live algae. Based on this model, PCBs were enriched in algal cells during bloom seasons (spring and fall) compared to non-bloom seasons (summer and winter). Further, although individual PCB congener partition coefficients (log) to live algal cells (range=5.3-6.4) overlapped to those for detritus (range=3.6-7.4), PCBs tended to be enriched in detrital carbon pools during non-bloom conditions. The larger range of estimated PCB partition coefficients for detritus likely reflects the more heterogeneous nature of this material compared to live algal cells. Published by Elsevier B.V.