U动员和相关的U同位素分离由硫氧化细菌
C D Rosendahl1, Y Roebbert1, A Schippers2
1Leibniz Universität Hannover, Institut für Mineralogie, Hannover, Germany.
Frontiers in microbiology
|August 3, 2023
概括
(U) 的生物修复可以通过氧化硫细菌逆转. 酸性菌铁氧化剂动员U(IV),但没有同位素分离,质疑长期生物修复的可持续性.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 地质化学 地质化学
背景情况:
- 污染对健康构成重大风险,需要有效的补救策略.
- 生物修复将可溶性U(VI) 转化为不溶性U(IV),但这种情况可以通过氧化硫细菌逆转.
- 生物修复的长期稳定性,特别是非晶体U(IV),是不确定的.
研究的目的:
- 研究Acidithiobacillus ferrooxidans和Thiobacillus denitrificans在调动非晶体U的有效性 (IV).
- 评估这些细菌在调动期间的同位素分离.
- 评估污染场地生物修复的可持续性.
主要方法:
- 非晶体U的化 (IV) 与Acidithiobacillus ferrooxidans和Thiobacillus denitrificans的培养.
- 使用ICP-MS进行调动的量化.
- 分析同位素比率 (例如238U/235U),以检测分离.
主要成果:
- 在一周内,acidithiobacillus铁氧化剂调动了7491%的U,不论细胞活动 (活跃或不活跃).
- 提奥巴西勒斯 (Thiobacillus denitrificans) 没有显示出任何显著的U的动员.
- 由A. ferrooxidans动员的没有导致可观测的同位素分离.
结论:
- 酸性菌铁氧化剂有效地调动非晶体U(IV),主要是通过与细胞生物质的相互作用.
- 缺少同位素分离表明,U同位素比不是细菌重新动员的可靠指标.
- 这些发现引发了人们对污染场所的长期现场生物修复可持续性的担忧,因为潜在的U(IV) 重组.
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