Analysis of environmental biological effects and OBT accumulation potential of microalgae in freshwater systems exposed to tritium pollution.

Autor: Lai JL; School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China; State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China., Li ZG; State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China., Han MW; State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China., Huang Y; School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China., Xi HL; State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China. Electronic address: xihailing@sklnbcpc.cn., Luo XG; School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China. Electronic address: lxg@swust.edu.cn.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2024 Feb 15; Vol. 250, pp. 121013. Date of Electronic Publication: 2023 Dec 14.
DOI: 10.1016/j.watres.2023.121013
Abstrakt: The ecological risk of tritiated wastewater into the environment has attracted much attention. Assessing the ecological risk of tritium-containing pollution is crucial by studying low-activity tritium exposure's environmental and biological effects on freshwater micro-environment and the enrichment potential of organically bound tritium (OBT) in microalgae and aquatic plants. The impact of tritium-contaminated wastewater on the microenvironment of freshwater systems was analyzed using microcosm experiments to simulate tritium pollution in freshwater systems. Low activity tritium pollution (10 5  Bq/L) induced differences in microbial abundance, with Proteobacteria, Bacteroidota, and Desulfobacterota occupying important ecological niches in the water system. Low activity tritium (10 5 -10 7  Bq/L) did not affect the growth of microalgae and aquatic plants, but OBT was significantly enriched in microalgae and two aquatic plants (Pistia stratiotes, Spirodela polyrrhiza), with the enrichment coefficients of 2.08-3.39 and 1.71-2.13, respectively. At the transcriptional level, low-activity tritium (10 5  Bq/L) has the risk of interfering with gene expression in aquatic plants. Four dominant cyanobacterial strains (Leptolyngbya sp., Synechococcus elongatus, Nostoc sp., and Anabaena sp.) were isolated and demonstrated good environmental adaptability to tritium pollution. Environmental factors can modify the tritium accumulation potential in cyanobacteria and microalgae, theoretically enhancing food chain transfer.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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