期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 56, 期 9, 页码 5421-5429出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c08380
关键词
SOA; organonitrates; AMS; TDLIF; chamber experiments; ?-pinene
资金
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [840217]
- program in Environmental Chemical Sciences of the Division of Chemistry of the USA National Science Foundation [ECS-2003368]
- European Union [840217]
- Harvard-NUIST project
- Schmidt Science Fellow program
- Rhodes Trust
- Harvard University Center for the Environment
- Natural Sciences and Engineering Research Council of Canada
- Marie Curie Actions (MSCA) [840217] Funding Source: Marie Curie Actions (MSCA)
This study investigated the influence of nitrogen oxides (NOx) concentration on the chemical pathways for the production of secondary organic aerosols (SOA). The results showed that the production and partitioning of organonitrates are affected by the NOx concentration, and the yield of SOA increases as NOx concentration increases.
The chemical pathways for the production of secondary organicaerosols (SOA) are influenced by the concentration of nitrogen oxides (NOx),including the production of organonitrates (ON). Herein, a series of experimentsconducted in an environmental chamber investigated the production andpartitioning of total organonitrates from alpha-pinene photo-oxidation from <1 to24 ppb NOx. Gas-phase and particle-phase organonitrates (gON and pON,respectively) were measured by laser-inducedfluorescence (LIF). Thecomposition of the particle phase and the particle mass concentration weresimultaneously characterized by online aerosol mass spectrometry. The LIF andMS measurements of pON concentrations had a Pearson correlation coefficient of0.91 from 0.3 to 1.1 mu gm-3. For 1-6 ppb NOx, the yield of SOA particle massconcentration increased from 0.02 to 0.044 with NOxconcentration. For >6 ppbNOx, the yield steadily dropped, reaching 0.034 at 24 ppb NOx. By comparison,the yield of pON steadily increased from 0.002 to 0.022 across the range ofinvestigated NOxconcentrations. The yield of gON likewise increased from 0.005 to 0.148. The gas-to-particle partitioning ratio(pON/(pON + gON)) depended strongly on the NOxconcentration, changing from 0.27 to 0.13 as the NOxincreased from <1 to24 ppb. In the atmosphere, there is typically a cross-over point between clean and polluted conditions that strongly affects SOAproduction, and the results herein quantitatively identify 6 ppb NOxas that point for alpha-pinene photo-oxidation under these studyconditions, including the production and partitioning of organonitrates. The trends in SOA yield and partitioning ratio as a functionof NOx occur because of the changes in pON volatility
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