对同位素丰富纳米颗粒的环境转化和生物可用性评估的时间效率高的方法,以增加环境相关性
Sebastian Kuehr1, Ralf Kaegi2, Johannes Raths3
1Norwegian Institute for Water Research, Oslo, Norway.
The Science of the total environment
|March 11, 2025
概括
在废水污泥中的工程纳米颗粒 (NP) 转化减少了水生生物的金属吸收. 这项研究开发了一种新的方法,可以在现实的环境条件下跟踪NP的命运和影响.
科学领域:
- 环境科学 环境科学
- 环境化学环境化学
- 生态毒理学 生态毒理学
背景情况:
- 工程纳米粒子 (NP) 越来越多地释放到环境中,需要研究它们的命运和生态毒理学影响.
- 以前的研究经常使用不切实际的条件,如原始的NP和高度,限制了环境相关性.
- 在诸如废水处理厂 (WWTP) 等复杂矩阵中评估NP行为对于理解环境风险至关重要.
研究的目的:
- 开发和验证一种方法来追踪环境转化NP在WWTP矩阵中的相关度.
- 为了研究氧化物NP (ZnONPs) 和二氧化NP (TiO2NPs) 的吸收和积累,由地两足动物Hyalella azteca.
- 为了比较转型NP与原始NP的生物利用率和吸收率.
主要方法:
- 合成同位素丰富的46TiO2和68ZnONPs,用于精确的追踪.
- 用城市污水污泥加无氧消化器,以获得环境转化NP.
- 在淡水和水条件下使用NP的污泥为H. azteca吸收研究创建的暴露介质.
- 在污泥中的量化NP度和在两足动物组织中的积累.
主要成果:
- 转化后的68ZnONPs在污泥中达到目标度的90%,而46TiO2NPs仅达到33%,可能是由于聚合和沉.
- 暴露于转化68ZnONPs导致H. azteca组织中显著的Zn积累.
- 与原始的NP相比,NP转化减少了68Zn吸收的12倍,在淡水中效果更为明显.
结论:
- 无氧消化器的新方法提供了一种成本高效和时间高效的方法来研究WWTP中的NP命运和影响.
- 环境的转变显著改变了NP的生物可用性,减少了水生生物的金属吸收.
- 对于容易聚合的NP,如TiO2NPs,需要进一步优化,以提高方法的准确性.
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