Journal ArticleDOI
Factors affecting phytoplankton species‐specific differences in accumulation of 40 polychlorinated biphenyls (PCBs)
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Normalization of BAFs to the phospholipid fraction reduced species variability for the more hydrophobic congeners, supporting the hypothesismore » that these compounds have restricted membrane permeability.Abstract:
Experiments were conducted to compare the bioaccumulation of hydrophobic compounds among different phytoplankton divisions, and to evaluate the factors that affect species-specific differences. Unialgal batch cultures of Selenastrum capricornutum, Anabaena sp., and Synedra sp. were exposed to 40 PCB congeners at 11 C for 40 d. PCBs selected for this study represented all 10 homologs, different substitution patterns, and a wide range of physical-chemical properties representative of compounds known to bioaccumulate in aquatic organisms. Congener-specific partitioning into the algal phase over time was investigated. Species differences were observed in the rate and magnitude of accumulation. For all species, a rapid association of PCBs with the algal phase was followed by a slower partitioning from the media to the algae, which continued for several days. Bioaccumulation factors (BAFs) could be predicted from K[sub ow] for PCB congeners with log K[sub ow] values < 6.0, whereas no such correlation was found for the more hydrophobic congeners. Normalization of BAFs to total lipid or glycolipid content reduced some of the variability between species for the less hydrophobic congeners, but not for the more hydrophobic congeners. Normalization of BAFs to the phospholipid fraction reduced species variability for the more hydrophobic congeners, supporting the hypothesismore » that these compounds have restricted membrane permeability.« lessread more
Citations
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Our evolving conceptual model of the coastal eutrophication problem
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Algal bioaccumulation of triclocarban, triclosan, and methyl-triclosan in a North Texas wastewater treatment plant receiving stream
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BookDOI
Lipids in freshwater ecosystems
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Mixotrophic cyanobacteria and microalgae as distinctive biological agents for organic pollutant degradation.
Suresh R. Subashchandrabose,Balasubramanian Ramakrishnan,Balasubramanian Ramakrishnan,Mallavarapu Megharaj,Kadiyala Venkateswarlu,Kadiyala Venkateswarlu,Ravi Naidu +6 more
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Book ChapterDOI
Environmental fate and global distribution of polychlorinated biphenyls.
Angelika Beyer,Marek Biziuk +1 more
TL;DR: To know and understand the critical environmental fate pathways for PCBs, both a combination of field studies in real ecosystems and more controlled laboratory investigations are needed and revised and new models on how PCBs behave in the environment are needed.
References
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TL;DR: In this paper, the authors described a simplified version of the method and reported the results of a study of its application to different tissues, including the efficiency of the washing procedure in terms of the removal from tissue lipides of some non-lipide substances of special biochemical interest.
Journal ArticleDOI
Analysis of polychlorinated biphenyls (PCB) by glass capillary gas chromatography
Karlheinz Ballschmiter,M Zell +1 more
TL;DR: The composition of seven technical PCB-mixtures (Aroclor [Monsanto, USA] und Clophen A [Bayer, FRG]) has been investigated by high-resolution thin-film glass capillary gas chromatography with electron-capture detector.
Journal ArticleDOI
Simple conditions for growth of unicellular blue‐green algae on plates
TL;DR: The efficiencies of plating of 2 cultures of unicellular blue‐green algae, 1 coccoid and 1 rod‐shaped, were studied systematically to establish reproducible colony growth and accurate viable counts.
Journal ArticleDOI
The Measurement of Dissolved Organic and Particulate Carbon in SEAWATER1
David W. Menzel,Ralph F. Vaccaro +1 more
TL;DR: In this paper, a method for the rapid determination of dissolved organic carbon in seawater in concentrations between 0.1 and 20 mg/liter was described, which was carried out in sealed glass ampoules using K 2 S 2 O 8 as an oxidizing agent after the sample has been freed of inorganic carbon.
Journal ArticleDOI
Octanol-water partition coefficients of polychlorinated biphenyl congeners
TL;DR: In this paper, the total surface area (TSA) for polychlorinated biphenyl (PCB) congeners was determined by assuming planar molecules, van der Waal's radii for component atoms, and appropriate values for solvent radius, bond angles, and distances.