Carbonate Disequilibrium in the External Boundary Layer of Freshwater Chrysophytes: Implications for Contaminant Uptake

Environmental Science & Technology
Michel LavoieWarwick F Vincent

Abstract

The interplay between biological and chemical reactions in the freshwater phytoplankton phycosphere and the resulting modulations of contaminant speciation and uptake is poorly characterized. Here we modeled the effect of algal C and N uptake on carbonate cycling and speciation of selected contaminants in the phycosphere (external boundary layer) of chrysophytes, a key phytoplankton group in oligotrophic systems. We calculated an enrichment in H+ concentration relative to that in the bulk solution (pH 7.0) of approximately 40% or a depletion of approximately 30% for NH4+ or NO3--grown cells, respectively, at the algal membrane surface of a 5-μm radius cell. Such changes are mainly due to direct H+ uptake or release at the plasmalemma if NO3- or NH4+ is the N source, respectively. Due to these pH changes in the external boundary layer, competition between H+ and metals for uptake is enhanced, for NH4+-grown cells which contributes to a decrease in potential metal uptake. Our model suggests that the uptake of protonated weakly acidic organic acids (HA) is greater in NH4+-grown cells compared to that in NO3--grown cells. The account of chemical reactions in the algal external boundary layer could improve ecological risk assessment...Continue Reading

References

Jun 1, 1994·The Journal of Membrane Biology·T X Xiang, B D Anderson
Oct 3, 2002·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Peter G C CampbellBernard Vigneault
Jun 2, 2005·Environmental Science & Technology·Heliana Kola, Kevin J Wilkinson
May 2, 2006·Environmental Science & Technology·Jon A ArnotJeanette M Southwood
Jun 19, 2009·Environmental Science & Technology·Amiel BoullemantPeter G C Campbell
Mar 7, 2014·Environmental Toxicology and Chemistry·Michel LavoieClaude Fortin
Jul 26, 2014·Annual Review of Marine Science·Emilio Marañón
Oct 1, 2009·Journal of Phycology·Stephen C MaberlyDieter Sültemeyer
Jul 19, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·John A Raven, Mario Giordano
Sep 16, 2017·Journal of Experimental Botany·Howard GriffithsRosalind E M Rickaby
Oct 19, 2017·Environmental Science & Technology·Jiehong GuoMarta Venier

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Citations

Oct 6, 2020·Frontiers in Plant Science·Jong Im KimWoongghi Shin

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