« Previous AbstractSynergistic improving photo-Fenton and photo-catalytic degradation of carbamazepine over FeS(2)/Fe(2)O(3)/organic acid with H(2)O(2)in-situ generation    Next AbstractA Ric8/synembryn homolog promotes Gpa1 and Gpa2 activation to respectively regulate cyclic AMP and pheromone signaling in Cryptococcus neoformans »

J Phys Chem A

Title:		Products and mechanism of secondary organic aerosol formation from reactions of linear alkenes with NO3 radicals
Author(s):		Gong H; Matsunaga A; Ziemann PJ;
Address:		"Air Pollution Research Center, University of California, Riverside, CA 92521, USA"
Journal Title:		J Phys Chem A
Year:		2005
Volume:		109
Issue:		19
Page Number:		4312 - 4324
DOI:		10.1021/jp058024l
ISSN/ISBN:		1089-5639 (Print) 1089-5639 (Linking)
Abstract:		"Secondary organic aerosol (SOA) formation from reactions of linear alkenes with NO(3) radicals was investigated in an environmental chamber using a thermal desorption particle beam mass spectrometer for particle analysis. A general chemical mechanism was developed to explain the formation of the observed SOA products. The major first-generation SOA products were hydroxynitrates, carbonylnitrates, nitrooxy peroxynitrates, dihydroxynitrates, and dihydroxy peroxynitrates. The major second-generation SOA products were hydroxy and oxo dinitrooxytetrahydrofurans, which have not been observed previously. The latter compounds were formed by a series of reactions in which delta-hydroxycarbonyls isomerize to cyclic hemiacetals, which then dehydrate to form substituted dihydrofurans (unsaturated compounds) that rapidly react with NO(3) radicals to form very low volatility products. For the approximately 1 ppmv alkene concentrations used here, aerosol formed only for alkenes C(7) or larger. SOA formed from C(7)-C(9) alkenes consisted only of second-generation products, whereas for larger alkenes first-generation products were also present and contributions increased with increasing carbon number apparently due to the formation of lower volatility products. The estimated mass fractions of first- and second-generation products were approximately 50:50, 30:70, 10:90, and 0:100, for 1-tetradecene, 1-dodecene, 1-decene, and 1-octene SOA, respectively. This study shows that delta-hydroxycarbonyls play a key role in the formation of SOA in alkene-NO(3) reactions and are likely to be important in other systems because delta-hydroxycarbonyls can also be formed from reactions of OH radicals and O(3) with hydrocarbons"
Keywords:		"*Aerosols/chemistry Alkenes/chemistry Chemistry, Physical/*methods Electrons Free Radicals/chemistry Hydrocarbons/chemistry Ions Mass Spectrometry Models, Chemical Nitrates/*chemistry Temperature;"
Notes:		"MedlineGong, Huiming Matsunaga, Aiko Ziemann, Paul J eng Research Support, U.S. Gov't, Non-P.H.S. 2006/07/13 J Phys Chem A. 2005 May 19; 109(19):4312-24. doi: 10.1021/jp058024l"