Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 55, Issue 10, Pages 6718-6728Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c05881
Keywords
plant cells; bioassociation; Brassica napus; time-resolved laser-induced fluorescence spectroscopy; radionuclides; uranium; europium; speciation
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Funding
- Federal Ministry of Education and Research [02NUK051B]
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This study investigated the interaction of U(VI) and Eu(III) with Brassica napus suspension plant cells. Results showed that over 75% of U(VI) and Eu(III) were immobilized by the cells, with a multistage bioassociation process observed for cells exposed to 200μM U(VI). A new U species was identified, suggesting interaction with plant metabolites.
In this study, we investigated the interaction of U(VI) and Eu(III) with Brassica napus suspension plant cells as a model system. Concentration-dependent (0-200 mu M) bioassociation experiments showed that more than 75% of U(VI) and Eu(III) were immobilized by the cells. In addition to this phenomenon, time-dependent studies for 1 to 72 h of exposure showed a multistage bioassociation process for cells that were exposed to 200 mu M U(VI), where, after initial immobilization of U(VI) within 1 h of exposure, it was released back into the culture medium starting within 24 h. A remobilization to this extent has not been previously observed. The MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay was used to correlate the bioassociation behavior of Eu and U with the cell vitality. Speciation studies by spectroscopy and in silico methods highlighted various U and Eu species over the course of exposure. We were able to observe a new U species, which emerged simultaneously with the remobilization of U back into the solution, which we assume to be a U(VI) phosphate species. Thus, the interaction of U(VI) and Eu(III) with released plant metabolites could be concluded.
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