Lanthanum and Cerium Toxicity to the Freshwater Green Alga Chlorella fusca: Applicability of the Biotic Ligand Model.,Environmental Toxicology and Chemistry

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Lanthanum and Cerium Toxicity to the Freshwater Green Alga Chlorella fusca: Applicability of the Biotic Ligand Model.
Environmental Toxicology and Chemistry ( IF 3.6 ) Pub Date : 2020-04-28 , DOI: 10.1002/etc.4707
Imad Aharchaou ₁ , Cédrick Beaubien ₁ , Peter G C Campbell ₁ , Claude Fortin ₁

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The environmental risk assessment of rare earth elements (REEs) requires data on their potential toxicity. In the present study, the toxicity of lanthanum (La) and cerium (Ce) was studied in relation to metal speciation in solution. For both La and Ce, the use of organic ligands demonstrated that the calculated free ion concentration was a good indicator of toxicity. Whether in the absence or presence of organic ligands, when based on free ion concentrations, the obtained half-maximal effective concentrations were similar. When all generated data were pooled, Ce and La showed identical toxicity thresholds after 120 h of exposure with free ion concentration-based median effective concentration values (95% confidence intervals) of 0.48 (0.38-0.60) µM and 0.47 (0.36-0.61) µM for La3+ and Ce3+ , respectively. The inhibition of algal growth was also correlated with the intracellular lanthanide concentrations, regardless of the ligand used. Finally, increasing the ambient calcium concentration protected the test algae by reducing the amount of lanthanide internalized into the cells. These results suggest that, at constant pH (5.5), REE accumulation and toxicity are linked to the free ion concentration and ambient calcium concentration, as predicted by the biotic ligand model. Environ Toxicol Chem 2020;39:996-1005. © 2020 SETAC.

中文翻译：

镧和铈对淡水绿藻小球藻的毒性：生物配体模型的适用性。

稀土元素（REE）的环境风险评估需要有关其潜在毒性的数据。在本研究中，研究了镧（La）和铈（Ce）的毒性与溶液中金属形态的关系。对于La和Ce而言，有机配体的使用表明，计算出的自由离子浓度是毒性的良好指标。无论是否存在有机配体，基于自由离子浓度，所获得的半数最大有效浓度均相似。汇总所有生成的数据后，Ce和La暴露120 h后显示相同的毒性阈值，基于自由离子浓度的中位有效浓度值（95％置信区间）为0.48（0.38-0.60）µM和0.47（0.36-0.61） La3 +和Ce3 +分别为µM。不论使用何种配体，藻类生长的抑制作用也与细胞内镧系元素浓度相关。最后，通过减少内在细胞内的镧系元素的含量，增加环境钙的浓度可以保护测试藻类。这些结果表明，如生物配体模型所预测的，在恒定pH（5.5）下，REE积累和毒性与游离离子浓度和环境钙浓度有关。Environ Toxicol Chem 2020; 39：996-1005。©2020 SETAC。如生物配体模型所预测的那样，REE积累和毒性与游离离子浓度和环境钙浓度有关。Environ Toxicol Chem 2020; 39：996-1005。©2020 SETAC。如生物配体模型所预测的那样，REE积累和毒性与游离离子浓度和环境钙浓度有关。Environ Toxicol Chem 2020; 39：996-1005。©2020 SETAC。

更新日期：2020-04-28

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