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Environ Sci Technol

Title:		Formation of Low Volatility Organic Compounds and Secondary Organic Aerosol from Isoprene Hydroxyhydroperoxide Low-NO Oxidation
Author(s):		Krechmer JE; Coggon MM; Massoli P; Nguyen TB; Crounse JD; Hu W; Day DA; Tyndall GS; Henze DK; Rivera-Rios JC; Nowak JB; Kimmel JR; Mauldin RL; Stark H; Jayne JT; Sipila M; Junninen H; Clair JM; Zhang X; Feiner PA; Zhang L; Miller DO; Brune WH; Keutsch FN; Wennberg PO; Seinfeld JH; Worsnop DR; Jimenez JL; Canagaratna MR;
Address:		"Cooperative Institute for Research in Environmental Sciences (CIRES) , Boulder, Colorado 80309, United States. Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States. Divisions of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States. Center for Aerosol and Cloud Chemistry, Aerodyne Research , Billerica, Massachusetts 01821, United States. Division of Geological and Planetary Sciences, California Institute of Technology , Pasadena, California 91125, United States. National Center for Atmospheric Research , Boulder, Colorado 80301, United States. Department of Mechanical Engineering, University of Colorado , Boulder, Colorado 80309, United States. Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States. Tofwerk, AG, CH-3600, Thun, Switzerland. Department of Atmospheric and Oceanic Sciences, University of Colorado , Boulder, Colorado 80309, United States. Department of Physics, University of Helsinki , 00014, Helsinki, Finland. Department of Meteorology, Pennsylvania State University , University Park, Pennsylvania 16802, United States. Division of Engineering and Applied Science, California Institute of Technology , Pasadena, California 91125, United States"
Journal Title:		Environ Sci Technol
Year:		2015
Volume:		20150814
Issue:		17
Page Number:		10330 - 10339
DOI:		10.1021/acs.est.5b02031
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Gas-phase low volatility organic compounds (LVOC), produced from oxidation of isoprene 4-hydroxy-3-hydroperoxide (4,3-ISOPOOH) under low-NO conditions, were observed during the FIXCIT chamber study. Decreases in LVOC directly correspond to appearance and growth in secondary organic aerosol (SOA) of consistent elemental composition, indicating that LVOC condense (at OA below 1 mug m(-3)). This represents the first simultaneous measurement of condensing low volatility species from isoprene oxidation in both the gas and particle phases. The SOA formation in this study is separate from previously described isoprene epoxydiol (IEPOX) uptake. Assigning all condensing LVOC signals to 4,3-ISOPOOH oxidation in the chamber study implies a wall-loss corrected non-IEPOX SOA mass yield of approximately 4%. By contrast to monoterpene oxidation, in which extremely low volatility VOC (ELVOC) constitute the organic aerosol, in the isoprene system LVOC with saturation concentrations from 10(-2) to 10 mug m(-3) are the main constituents. These LVOC may be important for the growth of nanoparticles in environments with low OA concentrations. LVOC observed in the chamber were also observed in the atmosphere during SOAS-2013 in the Southeastern United States, with the expected diurnal cycle. This previously uncharacterized aerosol formation pathway could account for approximately 5.0 Tg yr(-1) of SOA production, or 3.3% of global SOA"
Keywords:		"Aerosols/*analysis Atmosphere/chemistry Butadienes/*analysis Hemiterpenes/*analysis Hydrogen Peroxide/*analysis Models, Theoretical Nitric Oxide/chemistry Organic Chemicals/*analysis Oxidation-Reduction Pentanes/*analysis Southeastern United States Time F;"
Notes:		"MedlineKrechmer, Jordan E Coggon, Matthew M Massoli, Paola Nguyen, Tran B Crounse, John D Hu, Weiwei Day, Douglas A Tyndall, Geoffrey S Henze, Daven K Rivera-Rios, Jean C Nowak, John B Kimmel, Joel R Mauldin, Roy L 3rd Stark, Harald Jayne, John T Sipila, Mikko Junninen, Heikki Clair, Jason M St Zhang, Xuan Feiner, Philip A Zhang, Li Miller, David O Brune, William H Keutsch, Frank N Wennberg, Paul O Seinfeld, John H Worsnop, Douglas R Jimenez, Jose L Canagaratna, Manjula R eng Research Support, U.S. Gov't, Non-P.H.S. 2015/07/25 Environ Sci Technol. 2015 Sep 1; 49(17):10330-9. doi: 10.1021/acs.est.5b02031. Epub 2015 Aug 14"