气候变化领域集成服务门户(CCPortal): Secondary organic aerosol formation from the oxidation of decamethylcyclopentasiloxane at atmospherically relevant OH concentrations

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DOI	10.5194/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
ISSN	1680-7316
EISSN	1680-7324
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
推荐引用方式 GB/T 7714	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.