Limited reversibility of bioconcentration of hydrophobic organic chemicals in phytoplankton

Environmental Science & Technology
Albert A Koelmans

Abstract

Aging, reversibility, and desorption rates for the binding of hydrophobic chemicals (HOC) to phytoplankton cells have not been directly measured. Here the effect of bioconcentration time on subsequent desorption of hexachlorobenzene (HCB) and polychlorinated biphenyls (PCBs) was studied for the alga Monoraphidium minutum. Cell suspensions were exposed to HCB and PCBs spanning a range of log Kow values of 5.7 to 8.2, for 0.13 to 14 d. Subsequently, reversibility and desorption rates were assessed by extracting the chemicals from the cells using infinite sink extractions with Tenax beads or Empore disks employed in the cell suspension. Uptake was biphasic with constant relative contributions of fast surface sorption. Desorption was biphasic too and well fitted to a first order two compartment model. Increasing exposure times resulted in increasing slowly desorbing chemical fractions and decreased desorption rates from these fractions. For the most hydrophobic PCBs, slowly desorbing fractions were >80-90%, whereas desorption half-lives from these fractions ranged up to 120 days. The slow desorption rates directly prove that bioconcentration to algae can be rate limited and imply that already after a few hours of exposure, HOCs may...Continue Reading

References

Feb 24, 2000·Ecotoxicology and Environmental Safety·B Halling-SørensenE Jacobsson
Sep 12, 2003·Environmental Science & Technology·Cheng-Wei Fan, John R Reinfelder
Mar 30, 2004·Environmental Science & Technology·Anna SobekUlf Larsson
Jan 10, 2006·Environmental Toxicology and Chemistry·Antje GerofkeMichael S McLachlan
Sep 15, 1981·Applied Optics·C W Draper
May 6, 2011·Chemosphere·Albert A Koelmans, Michiel T O Jonker
Apr 1, 1995·Environmental Science & Technology·A A KoelmansL Lijklema
Dec 27, 2011·The Science of the Total Environment·Fung-Chi KoKwee S Tew

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Citations

Jun 10, 2015·The Science of the Total Environment·Jiannan DingJianchao Liu
Mar 19, 2016·Journal of Hazardous Materials·Shuai ZhangFengchang Wu
Mar 6, 2015·Environmental Science and Pollution Research International·Jiannan DingZhenghua Zhang
Mar 7, 2019·Environmental Microbiology·Elena Cerro-GálvezMaria Vila-Costa

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Methods Mentioned

BETA
light microscopy

Software Mentioned

Tenax
Excel

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