生物和人类二次有机气溶在高度酸性衰老后变得光
Cynthia Wong1, Jett Vuong1, Sergey A Nizkorodov1
1Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States.
The journal of physical chemistry. A
|August 30, 2024
概括
高酸度将二次有机气溶 (SOA) 转化为光化合物,干扰初级生物气溶颗粒 (PBAP) 检测. 这项研究揭示了酸度.
科学领域:
- 大气化学 大气化学
- 气溶科学 气溶科学
- 频谱学是一种光谱学.
背景情况:
- 主要的生物气溶颗粒 (PBAPs) 和次要的有机气溶 (SOA) 具有相同的光学特性,这使得通过光复杂化检测PBAP.
- 粒子酸度对SOA光的影响及其对PBAP测量的干扰仍然不太清楚.
研究的目的:
- 在不同酸度条件下研究SOA的光特性.
- 了解粒子酸度如何影响SOA光学特性以及对生物气溶分析的潜在干扰.
主要方法:
- 由生物原 (d-烯,α-烯) 和人为原 (多烯,烯) 前体产生的SOA.
- SOA通过暴露于水性H2SO4在不同度中的2天而老化.
- 吸收和光光谱仪用于分析光学属性变化.
主要成果:
- 强烈吸光和光化合物在pH ≈-1的SOA中形成,表明酸度驱动SOA老化.
- 来自生物基前体的老化SOA表现出比人为前体的老化SOA更高的光度.
- 老SOA的光光谱与PBAP的光光谱重叠,表明了潜在的误识.
结论:
- 酸度是SOA光学属性修改的一个重要因素,导致光度增加.
- 陈旧的SOA可以干扰基于光的PBAP检测,特别是在酸性大气区域.
- 这些发现与大气中硫酸度高的区域有关,例如上层热层和下层平流层.
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