在中国北方的雾期间,有机物质及其特定来源的关键毒素的动态氧化潜力
Feiyan Cao1, Xinxin Feng2, Yong Han3
1Department of Environmental Science and Engineering, Fudan University, Shanghai 200082, China.
Environment international
|March 4, 2026
概括
这项研究调查了雾事件期间的细颗粒物 (PM2.5),揭示了初级燃烧源和二级有机气溶形成对其氧化潜力 (OP) 有显著的贡献. 含有的化合物,特别是/氧化凝聚芳香化合物,被确定为关键的有毒成分.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 公共卫生 公共卫生
背景情况:
- 含有细颗粒物 (PM2.5) 的雾事件对健康构成重大风险.
- 关于PM2.5化学成分,来源和对健康的影响之间的确切联系仍然不清楚.
- 了解这些联系对于制定有效的空气质量管理策略至关重要.
研究的目的:
- 在雾事件期间调查PM2.5中甲醇溶性有机物 (MSOM) 的化学特性和氧化潜力 (OP).
- 确定有助于PM2.5.5的OP的主要来源.
- 为了阐明分子层面的理解 PM2.5 在雾期间的有毒成分.
主要方法:
- 高时间分辨率 (1小时) 的PM2.5.5离线采样.
- 测量甲醇溶性有机物 (MSOM) 的氧化潜力 (OPv和OPm).
- 使用正矩阵因子化 (PMF) 和通过里埃变换离子循环子共振质谱法 (FT-ICR MS) 的分子识别来进行源分配.
主要成果:
- 主要燃烧源 (车辆排放,生物质燃烧,煤炭燃烧) 在总质量正常化OP (OPm) 中贡献了约60%.
- 水相二次有机气溶形成过程对OPm贡献了约36%.
- 含的有机化合物,特别是/氧化凝聚芳香化合物 (Nitro-/O-ConA) 和高氧高度不和化合物 (HO-HUPC),是OPm的主要贡献者.
结论:
- 主要排放对夜间的OPm有很大的贡献,而二次有机气溶过程在白天是主要的贡献者.
- /氧化凝聚芳香化合物 (Nitro-/O-ConA) 是主要排放中的关键有毒成分.
- 二次来源以高氧高度不和化合物 (HO-HUPC) 进行丰富,改善分子层面对雾成分和毒性的理解.
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