微塑料在实验曝光介质中的稳定性和分散性及其通过SMLS,SAXS,拉曼显微镜和SEM的维度表征
Chardel Ompala1, Jean-Philippe Renault2, Olivier Taché2
1Université Paris-Saclay, CEA, CNRS, NIMBE, 91191 Gif Sur Yvette, France; Laboratoire National de métrologie et d'Essais, Nanometrology, CARMEN Platform, 29 avenue Roger Hennequin, 78197 Trappes Cedex, France.
Journal of hazardous materials
|March 21, 2024
概括
微塑料 (MP) 污染是一个全球性的挑战. 在MP上蛋白冠状形成会产生二次纳米塑料,增加环境风险,并需要先进的检测方法.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 塑料生产导致全球塑料储量不断增长,这给环境带来了重大挑战.
- 微塑料 (MP) 污染及其相关的环境损害,包括毒性和生物可用性,是主要问题.
- 在水生环境中,MP周围的生物分子冠状的形成增强了悬浮的稳定性,使准确的属性评估变得复杂.
研究的目的:
- 精确地定义和测量MP在复杂介质中的基本物理性质,考虑到蛋白质冠状形成.
- 研究蛋白质吸附对MP稳定性,分散性,聚合和大小的影响.
- 开发和整合分析方法来表征MP悬浮物和检测二次纳米塑料.
主要方法:
- 使用静态多重光散射 (SMLS),小角度X射线散射 (SAXS),拉曼显微镜和扫描电子显微镜 (SEM).
- 测量了聚乙烯和聚烯MP的颗粒大小,密度,稳定性和聚合状态.
- 在水性介质中通过牛血清白蛋白 (BSA) 稳定分析的MP悬浮液.
主要成果:
- SEM分析揭示了老化MP悬浮液中纳米塑料碎片的形成.
- 观察到蛋白质吸附有利于二级纳米塑料的形成.
- 综合分析方法 (SEM,SMLS,SAXS) 有效地描述了MP悬浮物,并突出了蛋白冠对尺寸测量的影响.
结论:
- 在MP上蛋白质冠状形成可以导致二次纳米塑料的产生,从而构成额外的生态威胁.
- 综合分析方法可以检测二次纳米塑料,这对于环境监测至关重要.
- 这项研究为监测和控制人类潜在暴露于微塑料和纳米塑料的基础.
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