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

Lachaux, Nicolas; Catrouillet, Charlotte; Marsac, Rémi; Poirier, Laurence; Pain-Devin, Sandrine; Gross, Elisabeth Maria; Giambérini, Laure

doi:10.1016/j.envpol.2022.119554

Cited by 21 publications

(13 citation statements)

References 64 publications

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“…Similar results were observed with Chlorella fusca, by a decrease of Ce and La uptake and toxicity in the presence of organic ligands (Aharchaou et al, 2020). This DOM protective effect was mitigated for Yb in the crustacean test probably because of Yb precipitation (Lachaux et al, 2022).…”

Section: Dom Influence On Ree Toxicitysupporting

confidence: 82%

“…Contrary to Nd, Gd and the mixture, we observed that the difference of Yb accumulation with and without DOM was not as large in the crustacean and fish tests. This could be explained by an unchanged bioavailability of Yb due to Yb(OH) 3 precipitation with and without DOM in the single experiments (Lachaux et al, 2022). Precipitation may influence Yb bioavailability and the subsequent bioaccumulation with and without DOM while Nd, Gd, mixture bioavailability was mainly driven by REE-DOM complexation (no precipitation with hydroxides occurred for Nd, Gd and the mixture), as shown earlier (Lachaux et al, 2022).…”

Section: Dom Influence On Ree Bioaccumulationmentioning

confidence: 60%

“…The formation of REE-DOM complexes decreased REE bioavailability, explaining the reduced bioaccumulation in the presence of DOM observed in the crustacean test (Lachaux et al, 2022). We assume a similar REE behaviour in the fish test because the composition of the crustacean and fish test medium is identical.…”

Section: Dom Influence On Ree Bioaccumulationmentioning

confidence: 91%

“…The stock solution was stored in the dark at 5 °C. The DOM stock solution was diluted in MilliQ water to obtain the desired DOC concentration of 8 mg C L −1 in the test flasks (Lachaux et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

“…After testing their individual toxicity, we tested the toxicity of REE in ternary equitoxic mixture, meaning that each REE was present in the mixture at an equivalent toxicity (ECx). Then, REE concentrations tested in the mixture (Table 2) were selected according to the nominal ECx values (EC 5 , EC 10 , EC 30 , EC 50 , EC 65 , EC 75 , EC 80 ) of each REE determined in the single experiments (Lachaux et al, 2022). One third of each ECx was used (because there were 3 compounds in the mixture) leading to an expected mixture effect of x% in case of additivity (ECx Mix = ECx Nd /3 + ECx Gd /3 + ECx Yb /3) (Minguez et al, 2018).…”

Section: Algal Growth Inhibition Test (Primary Producer)mentioning

confidence: 99%

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Integrated environmental risk assessment of rare earth elements mixture on aquatic ecosystems

Lachaux

Cossu-Leguille

Poirier

et al. 2022

Front. Environ. Sci.

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Rare Earth elements (REE) have become essential in strategical sectors such as high- and green-technologies. Their increasing use in human activities worldwide leads to anthropogenic REE releases detectable in all compartments of the environment, transforming REE into emerging contaminants. However, their potential impacts on ecosystems are still poorly understood. In order to have a comprehensive understanding of REE ecotoxicology and to properly assess their environmental risk, we analysed the toxicity of three representative REE (neodymium Nd, gadolinium Gd, and ytterbium Yb). Following recommendations of the European Chemicals Agency, we assessed REE hazard by performing standard ecotoxicological tests on three freshwater species belonging to different trophic levels (algae, crustacean and fish). EC50 were calculated using different modes of expression of REE exposure concentration (based on nominal, measured total and dissolved concentrations) in order to more properly and accurately determine REE toxicity. In order to get closer to environmental conditions, we also tested the toxicity of REE in mixture because all of them occur naturally as such in the environment. Moreover, we added dissolved organic matter (DOM) in the test medium because DOM is ubiquitous and drives REE speciation in freshwater systems. The Results showed that DOM significantly reduced REE bioaccumulation and toxicity, probably by formation of non-bioavailable REE-DOM complexes. The algal species was the most sensitive to REE. Despite slight differences between Nd, Gd and Yb in behaviour and bioaccumulation, the three REE exhibited comparable toxicity and additive effects in mixture to all tested organisms. Thus, we considered REE as a uniform group and, for the first time, we used mixture toxicity values and environmental mixture concentrations to assess the risk of REE in freshwater (instead of considering different REE separately). The results revealed that the risk is currently limited to wastewater treatment plants, and industrial and mining activities, where released quantities of REE can induce severe damage to exposed freshwater organisms. However, the risks are likely more widespread in the future because anthropogenic REE releases are expected to increase.

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Section: Dom Influence On Ree Toxicitysupporting

confidence: 82%

Section: Dom Influence On Ree Bioaccumulationmentioning

confidence: 60%

Section: Dom Influence On Ree Bioaccumulationmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Algal Growth Inhibition Test (Primary Producer)mentioning

confidence: 99%

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