在过器上的二次有机气溶和水溶液中的长期暗化学过程
Julian Resch1, Kangwei Li1, Markus Kalberer1
1Department of Environmental Sciences, University of Basel, Klingelbergstrasse 27, 4056 Basel, Switzerland.
Environmental science & technology
|July 30, 2024
概括
二次有机气溶 (SOA) 的成分在储存过程中发生变化. 过器储存导致二聚体增加,而单聚体减少,与水性提取物不同,突出显示采样工件.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
背景情况:
- 二次有机气溶 (SOA) 显著影响气候和健康.
- 过采样是SOA分析的常用方法,但可以引入文物.
- 了解SOA组成的变化随着时间的推移对于准确的评估至关重要.
研究的目的:
- 为了研究储存在水性提取物和过器上的SOA的化学成分差异.
- 在几周内分析SOA单体和小分子的时间变化.
- 在SOA分析中识别和突出显示与存储相关的文物.
主要方法:
- 实验室产生的SOA以水性提取物和室温过器的形式储存.
- 样品使用液态色谱学与高分辨率质谱学 (LC-HRMS) 结合分析.
- 在长达4周的储存期内监测化学成分.
主要成果:
- 随着时间的推移,SOA水性提取物显示出单体度的增加和二体度的减少.
- 过器上的SOA表现出二元度持续增加和单元度下降.
- 在两种储存方法之间观察到时间度变化的显著差异.
结论:
- 过器采样和储存引入了影响SOA化学成分的重要工件.
- 过器上的粒子相反应可以模仿大气粒子衰老过程.
- 仔细考虑存储文物对于准确的SOA组成研究至关重要.
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