Passive Partitioning of Polychlorinated Biphenyls between Seawater and Zooplankton, a Study Comparing Observed Field Distributions to Equilibrium Sorption Experiments

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• 作者：Anna Sobek ; Gerard Cornelissen ; Peter Tiselius ; Ö ; rjan Gustafsson
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：November 1, 2006
• 年：2006
• 卷：40
• 期：21
• 页码：6703 - 6708
• 全文大小：177K
• 年卷期：v.40,no.21(November 1, 2006)
• ISSN：1520-5851

文摘

From previous studies, it remains unclear whetherpolychlorinated biphenyls (PCBs) are biomagnified inzooplankton or if concentrations are simply governed bypassive partitioning. In this study, in the Gullmar Fjord on theSwedish west coast, field-determined lipid-normalizedpartition coefficients (log K_lip) were compared to equilibriumpartition coefficients from laboratory sorption experimentswith dead and preserved zooplankton. There was nosignificant difference between the linear regressions oflog K_lip-log K_ow (analysis of covariance [ANCOVA], p < 0.05)for field and laboratory-determined partition coefficients,supporting passive partitioning being the dominant uptakepathway for PCBs in the Gullmar Fjord zooplankton. The field-observed partition coefficients were also suggestive of passivepartitioning, as all field-log K_lip-log K_ow regressionswere significant (p < 0.05, r² = 0.74-0.95) and apparentlylinear. Further, there was generally no positive correlationbetween apparent biomagnification factors (BMF;concentration in zooplankton [pg/kgoc]/concentration inphytoplankton [pg/kgoc]) and trophic level (on the basis of¹⁵N). The in-situ organic carbon (-oc)-normalizedconcentrations in zooplankton (>200 m) were notstatistically different from oc-normalized concentrations inphytoplankton (0.7-50 m), which supports the absenceof significant biomagnification.