含有金属的纳米粒子在中国燃煤发电厂产生的煤灰中的氧化潜力
Miao Xu1, Zuoshun Niu1, Chang Liu1
1Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
Environment & health (Washington, D.C.)
|October 30, 2024
概括
煤炭飞灰含有金属纳米粒子 (MNP),在吸入时构成显著的氧化应激风险. 细煤飞灰中的这些纳米粒子具有比PM2.5更高的氧化潜力,影响呼吸系统健康.
科学领域:
- 环境科学 环境科学
- 纳米技术 纳米技术
- 毒理学 毒理学 毒理学
背景情况:
- 燃煤发电厂 (CFPP) 释放大量含有金属的纳米粒子 (MNP).
- 吸入的MNP可能会在呼吸系统中引起氧化应激.
- 煤灰 (CFA) 是含有这些纳米粒子的主要副产品.
研究的目的:
- 分析含有金属的纳米粒子 (MNPs) 和氧化潜力 (OP) 在中国煤灰的细分数 (<1μm).
- 研究MNP特征,金属含量和OP之间的关系.
- 了解影响CFPP中MNP生成的因素.
主要方法:
- 分析含有Fe和Ti的NP的颗粒数度 (PNC) 和大小,CFA分数<1μm.
- 在模拟的肺液中使用AA方法测量OP.
- 结构方程建模以确定调节OP的因素.
主要成果:
- 在CFA中占主导地位的MNP是含有Fe和Ti的NP,平均尺寸为87和89nm.
- 对于<1μm CFA 分数的OP值比城市PM2.5.5高出2-3个数量级.
- 金属度,MNP PNC,以及溶解的金属/纳米颗粒显著调节了OP.
结论:
- 微细分数的CFA含有高度的MNP与大量的OP.
- 燃烧低级煤炭或使用低效能炉的CFPP产生的MNP水平较高.
- 从CFA吸入的MNP可能会通过溶解的金属释放或微小纳米颗粒的形成增加氧化应激.
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