Influence of nitrogen status on the bioconcentration of hydrophobic organic compounds to Selenastrum capricornutum

B. Halling-Sørensen, Niels Nyholm, Kresten Ole Kusk, E. Jacobsson

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Changes in algal nitrogen status that increase algal lipid content also a€ect the bioconcentration of hydrophobic organic compounds (HOCs). Bioconcentration factors (BCFs) for several HOCs increased up to nine times as the total algal lipid content of the green algae Selenastrum carpricornutum in- creased from 17 to 44% of the algal dry weight as a consequence of nitrogen starvation. An increase in total lipid from 17 to 44% should theoretically increase the BCFs by a factor of 2.6. BCFs for PCB 31, PCB 49, PCB 153, and DDT increased with maximum lipid content by factors of 6.3, 8.9, 8.9, and 6.6, respectively, thus more than theoretically predicted from the lipid normalization of BCFs obtained at exponential growth phase (17% total lipid for S. carpricornutum), whereas BCFs for PCB 105, phenanthrene, and 4-chloroaniline increased at 44% lipid content, only by factors of 1.5, 1.5, and 2.5, respectively, and thus less than or equal to the theoretical prediction. Lipid- class normalization of BCFs did not reveal signi®cant informa- tion beyond that available from normalizing to total lipid. # 2000 Academic Press
    Original languageEnglish
    JournalEcotoxicology and Environmental Safety
    Volume45
    Pages (from-to)33-42
    ISSN0147-6513
    DOIs
    Publication statusPublished - 2000

    Keywords

    • lipid normalization
    • HOCs
    • PCBs
    • S. carpricornutum
    • algal bioconcentration
    • nutritional status

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