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首页> 外文期刊>Environmental Science & Technology >Real-Time, Single-Particle Measurements of Oligomers in Aged Ambient Aerosol Particles
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Real-Time, Single-Particle Measurements of Oligomers in Aged Ambient Aerosol Particles

机译：老化的环境气溶胶颗粒中低聚物的实时，单颗粒测量

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摘要

Unique high mass negative ions in the -200 to -400 mass/charge range with repetitive spacings of 12, 14, and 16 units, representative of oligomeric species, have been detected in single ambient submicrometer aerosol particles using real-time single-particle mass spectrometry during the Study of Organic Aerosols field campaign conducted in Riverside, CA (SOAR) in August and November 2005. These oligomer-containing particles represented 33-40% of the total detected particles and contained other indicators of aging including oxidized organic carbon, amine, nitrate, and sulfate ion markers. Overall, the highest mass oligomeric patterns were observed in small acidic 140-200 nm particles in the summer. Also during the summer, increased oligomer intensities were observed when the particles were heated with a thermodenuder. We hypothesize that heat removed semivolatile species, thereby increasing particle acidity, while concentrating the oligomeric precursors and accelerating oligomerformation. Differences in oligomer behavior with respect to particle size and heating can be attributed to seasonal differences in photochemical oxidation, the relative amount of ammonium, and particle acidity.
机译：使用实时单粒子质量在单个环境亚微米气溶胶粒子中已检测到-200至-400质量/电荷范围内的独特高质量负离子，其重复间隔为12、14和16个单位（代表低聚物种）。在2005年8月和11月在加利福尼亚州里弗赛德（SOAR）进行的有机气溶胶研究活动中进行了光谱分析。这些含低聚物的颗粒占检测到的颗粒总数的33-40％，并且还包含其他老化指标，包括氧化的有机碳，胺，硝酸盐和硫酸盐离子标记。总体而言，夏季在140-200 nm酸性小颗粒中观察到最高质量的寡聚体模式。同样在夏季，当用热剥蚀剂加热颗粒时，观察到低聚物强度增加。我们假设热量除去了半挥发性物质，从而增加了颗粒的酸度，同时浓缩了低聚物的前体并加速了低聚物的形成。低聚物行为相对于粒度和加热的差异可归因于光化学氧化，铵的相对量和颗粒酸度的季节性差异。

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