Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Implications of speciation on rare earth element toxicity: A focus on organic matter influence in Daphnia magna standard test

Abstract : Rare earth elements (REE) have become essential in high- and green-technologies. Their increasing use lead to the release of anthropogenic REE into the environment including aquatic systems. The limited data available on the aquatic ecotoxicology of REE indicate their biological effects are highly dependent on their speciation, posing challenges for a reliable environmental risk assessment (ERA). The current study assessed the influence of speciation on the toxicity of neodymium (Nd), gadolinium (Gd) and ytterbium (Yb) in the Daphnia magna mobility inhibition test (ISO 6341:2012). REE toxicity was assessed individually and in ternary mixture, in the absence and presence of dissolved organic matter (DOM). Speciation was predicted by modeling and REE bioaccumulation by D. magna was measured to better understand the relationship between REE speciation and toxicity. DOM decreased significantly the toxicity of Nd, Gd and the mixture towards this freshwater crustacean. This was explained by a lower REE bioaccumulation in the presence of DOM due to REE-DOM complexation, which reduced REE bioavailability. DOM effects on Yb toxicity and bioaccumulation were limited because of Yb precipitation. We show that the way of expressing EC50 values (based on nominal, measured or predicted REE concentrations in solution) drastically changed REE toxicity assessment and that these changes were influenced by REE speciation. This study demonstrates for the first time that REE speciation, and especially REE-DOM complexation, significantly influences REE bioaccumulation and toxicity towards D. magna. Our results have implications for the subsequent ERA of REE.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03681096
Contributor : Isabelle Dubigeon Connect in order to contact the contributor
Submitted on : Monday, May 30, 2022 - 9:25:25 AM
Last modification on : Saturday, July 2, 2022 - 3:37:07 AM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2022-11-30

Please log in to resquest access to the document

Identifiers

Citation

Nicolas Lachaux, Charlotte Catrouillet, Remi Marsac, Laurence Poirier, Sandrine Pain-Devin, et al.. Implications of speciation on rare earth element toxicity: A focus on organic matter influence in Daphnia magna standard test. Environmental Pollution (Elsevier), 2022, 307, pp.119554. ⟨10.1016/j.envpol.2022.119554⟩. ⟨insu-03681096⟩

Share

Metrics

Record views

0