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DOI | 10.1021/acs.jpca.6b00275 |
Variation in pH of Model Secondary Organic Aerosol during Liquid-Liquid Phase Separation | |
Dallemagne, Magda A.1,2; Huang, Xiau Ya1; Eddingsaas, Nathan C.1 | |
发表日期 | 2016-05-12 |
ISSN | 1089-5639 |
卷号 | 120期号:18页码:2868-2876 |
英文摘要 | The majority of atmospheric aerosols consist of both organic and inorganic components. At intermediate relative humidity (RH), atmospheric aerosol can undergo liquid liquid phase separation (LLPS) in which the organic and inorganic fractions segregate from each other. We have extended the study of LLPS to the effect that phase separation has on the pH of the overall aerosols and the pH of the individual phases. Using confocal microscopy and pH sensitive dyes, the pH of internally mixed model aerosols consisting of polyethylene glycol 400 and ammonium sulfate as well as the pH of the organic fraction during LLPS have been directly measured. During LLPS, the pH of the organic fraction was observed to increase to 4.2 +/- 0.2 from 3.8 +/- 0.1 under high RH when the aerosol was internally mixed. In addition, the high spatial resolution of the confocal microscope allowed us to characterize the composition of each of the phases, and we have observed that during LLPS the organic shell still contains large quantities of water and should be characterized as an aqueous organic-rich phase rather than simply an organic phase. |
语种 | 英语 |
WOS记录号 | WOS:000375968800011 |
来源期刊 | JOURNAL OF PHYSICAL CHEMISTRY A
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来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/57941 |
作者单位 | 1.Rochester Inst Technol, Sch Chem & Mat Sci, 85 Lomb Mem Dr, Rochester, NY 14623 USA; 2.EPA Reg 6, Dallas, TX 75202 USA |
推荐引用方式 GB/T 7714 | Dallemagne, Magda A.,Huang, Xiau Ya,Eddingsaas, Nathan C.. Variation in pH of Model Secondary Organic Aerosol during Liquid-Liquid Phase Separation[J]. 美国环保署,2016,120(18):2868-2876. |
APA | Dallemagne, Magda A.,Huang, Xiau Ya,&Eddingsaas, Nathan C..(2016).Variation in pH of Model Secondary Organic Aerosol during Liquid-Liquid Phase Separation.JOURNAL OF PHYSICAL CHEMISTRY A,120(18),2868-2876. |
MLA | Dallemagne, Magda A.,et al."Variation in pH of Model Secondary Organic Aerosol during Liquid-Liquid Phase Separation".JOURNAL OF PHYSICAL CHEMISTRY A 120.18(2016):2868-2876. |
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