In situ measurements of gas-particle partitioning of organic compounds in Fairbanks.

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Amna Ijaz, Brice Temime-Roussel, Julien Kammer, Jingqiu Mao, William Simpson, Kathy S Law, Barbara D'Anna
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Abstract

Organic compounds were measured in both the gas and particle phases in Fairbanks, Alaska, using a real-time, high-resolution proton transfer reaction-time of flight mass spectrometer (PTR-ToF MS) during a wintertime campaign. The organic aerosol (OA) was dominated by semi-volatile organic compounds (SVOCs), followed by compounds in the low-volatile bin (LVOCs). Due to the persistently cold conditions, both heavy and highly oxygenated compounds showed a limited shift in partitioning with temperature change. In contrast, some semi-volatile compounds, such as methoxy phenols from wood combustion, presented some partitioning to the particle phase at lower temperatures. Laboratory studies or theoretical efforts rarely explore gas-particle partitioning at extremely low temperatures, and thus, their applicability under complex meteorological conditions remains to be assessed. A comparison of the observed and estimated volatilities at temperatures from 5 to -33 °C revealed a clear disagreement, with higher estimated volatility for light molecules (m/z below 120) and lower volatilities for heavier compounds (m/z above 300) with respect to the observed ones. Our findings from the Fairbanks winter campaign stress the need to extend the breadth of environmentally relevant conditions under which phase partitioning of organic compounds is generally explored.

费尔班克斯有机化合物气-颗粒分配的原位测量。
在阿拉斯加费尔班克斯的冬季活动中,使用实时,高分辨率质子转移反应时间飞行质谱仪(PTR-ToF MS)测量了气相和颗粒相的有机化合物。有机气溶胶(OA)以半挥发性有机化合物(SVOCs)为主,其次是低挥发性化合物(LVOCs)。由于持续的寒冷条件,重氧化合物和高氧化合物随温度变化的分配变化有限。相比之下,一些半挥发性化合物,如木材燃烧产生的甲氧基酚,在较低温度下表现出一定的颗粒相分配。实验室研究或理论工作很少探索极低温下的气粒分配,因此,它们在复杂气象条件下的适用性仍有待评估。在5 ~ -33°C温度下,对观察到的和估计的挥发性进行比较,结果显示出明显的差异,相对于观察到的分子,轻分子(m/z低于120)的估计挥发性较高,而较重的化合物(m/z高于300)的挥发性较低。我们从费尔班克斯冬季运动的发现强调需要扩大环境相关条件的广度,在这种条件下,有机化合物的相分配通常被探索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Faraday Discussions
Faraday Discussions 化学-物理化学
自引率
0.00%
发文量
259
期刊介绍: Discussion summary and research papers from discussion meetings that focus on rapidly developing areas of physical chemistry and its interfaces
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