Kinetics of polychlorinated biphenyl partitioning to marine Chrysophyte Isochrysis galbana

• Published in: The Science of the total environment Vol. 416; pp. 410 - 417
• Main Authors: Ko, Fung-Chi, Baker, Joel E., Tew, Kwee S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-02-2012; Elsevier
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Applied ecology; Bioaccumulation; Biological and medical sciences; Ecotoxicology, biological effects of pollution; Fundamental and applied biological sciences. Psychology; Gas-purging; General aspects; Haptophyta - chemistry; Haptophyta - metabolism; Kinetics; PCBs; Phytoplankton; Polychlorinated Biphenyls - analysis; Polychlorinated Biphenyls - pharmacokinetics; Sea water ecosystems; Sorption; Synecology; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - pharmacokinetics; Sorption; PCBs; Phytoplankton; Kinetics; Bioaccumulation; Gas-purging; Isochrysis galbana; Algae; Polychlorobiphenyls; Haptophyta; Persistent organic pollutant; Marine environment; Heterokontophyta; Chrysophyceae; Halogenated hydrocarbon; Chlorocarbon; Aromatic compound; Biological accumulation; Organic compounds
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2011.11.042

This study focused on the uptake kinetics of polychlorinated biphenyl (PCB) congeners by the Chrysophyte, Isochrysis galbana. A gas-purging experimental system was used to maintain constant dissolved PCB concentrations. Three phases of absorption were observed: first, a rapid absorption phase within the first 15min, second, a first order process reaching the maximum concentration within 48h of exposure, and third, a plateau phase as yet to be determined with very slight increases in concentration. In this study, the percentage of the maximum concentration reached within the first phase varied from 10% to 67%, depending on the size of the PCB (as determined by molecular weight and total surface area), whereas the uptake rate (ku) during the second phase was more comparable across different PCBs. In addition, for the first phase, the bioconcentration factor (BCF) of PCBs deviated from its expected relationship with hydrophobicity, as determined by Kow, and was instead related to the molecular structure of the compound.