Linking the chemical speciation of cerium to its bioavailability in water for a freshwater alga

Environmental Toxicology and Chemistry
Philippe El-AklKevin J Wilkinson

Abstract

Over the past decade, researchers have begun to use metals of the lanthanide family for numerous applications, including liquid crystal display (LCD) screens, optical fibers, and laser technology. Unfortunately, little is presently known about their bioavailability or the mechanisms by which they might cause toxicity. The present study focuses on cerium (Ce), one of the most widely used lanthanides, and on validating the biotic ligand model as a means to predict Ce bioaccumulation. Short-term exposures to Ce were performed using the unicellular alga Chlamydomonas reinhardtii, to better relate Ce bioavailability to its chemical speciation in solution. Maximum uptake fluxes (Jmax ) and affinity constants for the binding of Ce to the biological uptake sites (KS ) were established at pH 5.0 and pH 7.0. An apparent affinity constant of 1.8 × 10(7) M(-1) was observed at pH 5.0, with a larger value obtained at pH 7.0 (6 × 10(7) M(-1) ), albeit under conditions where equilibrium could not be confirmed. By evaluating Ce speciation using centrifugal ultrafiltration and single-particle inductively coupled plasma spectrometry, it could be concluded that very little (∼30%) Ce was truly dissolved at pH 7.0, with the majority of the metal bei...Continue Reading

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Citations

Mar 7, 2020·Environmental Toxicology and Chemistry·Imad AharchaouClaude Fortin
Jan 25, 2019·The Science of the Total Environment·A Romero-FreireL Giamberini
Feb 13, 2018·Aquatic Toxicology·Lena A Kosak Née RöhderRenata Behra
Jun 28, 2021·Environmental Pollution·Elise MorelKevin J Wilkinson
Dec 27, 2018·Environmental Science & Technology·Gwyneth A MacMillanMarc Amyot
Sep 26, 2021·Bulletin of Environmental Contamination and Toxicology·Chun-Mei ZhaoRong-Liang Qiu

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