222 纳米杀菌灯产生的有机气溶胶:臭氧引发与非臭氧途径。

IF 4.3 3区 环境科学与生态学 Q1 CHEMISTRY, ANALYTICAL
Matthew B Goss, Jesse H Kroll
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引用次数: 0

摘要

输出波长为 222 纳米的紫外线杀菌灯(GUV222)可以通过有效灭活病原体来减少疾病在空气中的传播,同时对人类的直接接触也是安全的。然而,最近的研究发现,这些灯管是臭氧和其他二次污染物(如二次有机气溶胶)的来源,这些污染物对健康的影响必须与病原体灭活的益处相平衡。虽然臭氧反应可能是造成室内空气二次污染的主要原因,但 222 纳米光还可能引发其他非臭氧化学过程,包括其他氧化剂的形成和直接光解反应,而人们对这些过程的了解还不够深入。本研究通过比较实验室室内 GUV222 和纯 O3 控制条件下的柠檬烯氧化过程,研究 GUV222 对 SOA 形成和组成的影响。这些实验之间的差异使我们能够区分由臭氧化学作用驱动的气溶胶形成模式和由其他光解过程驱动的气溶胶形成模式。这些实验还检验了添加二氧化氮和亚硝酸(HONO)的影响,并研究了室外空气采样中 SOA 的形成。在 GUV222 与纯臭氧条件下,SOA 的组成和生成量仅略有不同;二氧化氮和 HONO 光解对观测到的化学成分没有明显影响。相反,我们观察到在高强度 222 纳米光(45 μW cm-2)条件下新粒子的形成与纯臭氧实验有很大不同。这种观察到的新粒子形成是将 GUV222 流率保持在最低有效水平的另一个原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Organic aerosol formation from 222 nm germicidal light: ozone-initiated vs. non-ozone pathways.

Germicidal ultraviolet lamps outputting 222 nm light (GUV222) have the potential to reduce the airborne spread of disease through effective inactivation of pathogens, while remaining safe for direct human exposure. However, recent studies have identified these lamps as a source of ozone and other secondary pollutants such as secondary organic aerosol (SOA), and the health effects of these pollutants must be balanced against the benefits of pathogen inactivation. While ozone reactions are likely to account for much of this secondary indoor air pollution, 222 nm light may initiate additional non-ozone chemical processes, including the formation of other oxidants and direct photolytic reactions, which are not as well understood. This work examines the impacts of GUV222 on SOA formation and composition by comparing limonene oxidation under GUV222 and O3-only control conditions in a laboratory chamber. Differences between these experiments enable us to distinguish patterns in aerosol formation driven by ozone chemistry from those driven by other photolytic processes. These experiments also examine the influence of the addition of NO2 and nitrous acid (HONO), and investigate SOA formation in sampled outdoor air. SOA composition and yield vary only slightly with respect to GUV222vs. ozone-only conditions; NO2 and HONO photolysis do not appreciably affect the observed chemistry. In contrast, we observe consistent new particle formation under high-fluence 222 nm light (45 μW cm-2) that differs substantially from ozone-only experiments. This observed new particle formation represents an additional reason to keep GUV222 fluence rates to the lowest effective levels.

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来源期刊
Environmental Science: Processes & Impacts
Environmental Science: Processes & Impacts CHEMISTRY, ANALYTICAL-ENVIRONMENTAL SCIENCES
CiteScore
9.50
自引率
3.60%
发文量
202
审稿时长
1 months
期刊介绍: Environmental Science: Processes & Impacts publishes high quality papers in all areas of the environmental chemical sciences, including chemistry of the air, water, soil and sediment. We welcome studies on the environmental fate and effects of anthropogenic and naturally occurring contaminants, both chemical and microbiological, as well as related natural element cycling processes.
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