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DOI10.5194/acp-22-917-2022
Secondary organic aerosol formation from the oxidation of decamethylcyclopentasiloxane at atmospherically relevant OH concentrations
Charan, Sophia M.; Huang, Yuanlong; Buenconsejo, Reina S.; Li, Qi; Cocker, David R., III; Seinfeld, John H.
发表日期2022
ISSN1680-7316
EISSN1680-7324
起始页码917
结束页码928
卷号22期号:2页码:12
英文摘要Decamethylcyclopentasiloxane (D5,C10H30O5Si5) is measured at parts per trillion (ppt) levels outdoors and parts per billion (ppb) levels indoors. Primarily used in personal care products, its outdoor concentration is correlated to population density. Since understanding the aerosol formation potential of volatile chemical products is critical to understanding particulate matter in urban areas, the secondary organic aerosol yield of D5 was studied under a wide range of OH concentrations and, correspondingly, OH exposures using both batch-mode chamber and continuously run flow tube experiments. These results were comprehensively analyzed and compared to two other secondary organic aerosol (SOA) yield datasets from literature. It was found that the SOA yield from the oxidation of D5 is extremely dependent on either the OH concentration or exposure. For OH concentrations of less than or similar to 10(7) molec. cm(-3) or OH exposures of less than or similar to 2 x 10(11) molec.s cm(-3), the SOA yield is largely < 5 % and usually similar to 1 %. This is significantly lower than SOA yields previously reported. Using a two-product absorptive partitioning model for the upper bound SOA yields, the stoichiometric mass fraction and absorptive partitioning coefficients are, for the first product, proportional to(1) = 0.056 and K-OM,K-1 = 0.022 m(3) mu g(-1); for the second product, they are proportional to(2) = 7.7 and K-OM,K-2 = 4.3 x 10(-5) m(3) mu g(-1). Generally, there are high SOA yields (> 90 %) at OH mixing ratios of 5 x 10(9) molec. cm(-3) or OH exposures above 10(12) molec.s cm(-3).
学科领域Environmental Sciences; Meteorology & Atmospheric Sciences
语种英语
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号WOS:000747146500001
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/273506
作者单位California Institute of Technology; California Institute of Technology; University of California System; University of California Riverside
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Charan, Sophia M.,Huang, Yuanlong,Buenconsejo, Reina S.,et al. Secondary organic aerosol formation from the oxidation of decamethylcyclopentasiloxane at atmospherically relevant OH concentrations[J],2022,22(2):12.
APA Charan, Sophia M.,Huang, Yuanlong,Buenconsejo, Reina S.,Li, Qi,Cocker, David R., III,&Seinfeld, John H..(2022).Secondary organic aerosol formation from the oxidation of decamethylcyclopentasiloxane at atmospherically relevant OH concentrations.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(2),12.
MLA Charan, Sophia M.,et al."Secondary organic aerosol formation from the oxidation of decamethylcyclopentasiloxane at atmospherically relevant OH concentrations".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.2(2022):12.
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