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Environ Sci Technol

Title:		Organic Nitrate Contribution to New Particle Formation and Growth in Secondary Organic Aerosols from alpha-Pinene Ozonolysis
Author(s):		Berkemeier T; Ammann M; Mentel TF; Poschl U; Shiraiwa M;
Address:		"Multiphase Chemistry Department, Max Planck Institute for Chemistry , Mainz 55128, Germany. Laboratory of Environmental Chemistry, Paul Scherrer Institute , Villigen 5232, Switzerland. Institute of Energy and Climate Research , IEK-8, Forschungszentrum Julich, Julich 52425, Germany"
Journal Title:		Environ Sci Technol
Year:		2016
Volume:		20160607
Issue:		12
Page Number:		6334 - 6342
DOI:		10.1021/acs.est.6b00961
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"The chemical kinetics of organic nitrate production during new particle formation and growth of secondary organic aerosols (SOA) were investigated using the short-lived radioactive tracer (13)N in flow-reactor studies of alpha-pinene oxidation with ozone. Direct and quantitative measurements of the nitrogen content indicate that organic nitrates accounted for approximately 40% of SOA mass during initial particle formation, decreasing to approximately 15% upon particle growth to the accumulation-mode size range (>100 nm). Experiments with OH scavengers and kinetic model results suggest that organic peroxy radicals formed by alpha-pinene reacting with secondary OH from ozonolysis are key intermediates in the organic nitrate formation process. The direct reaction of alpha-pinene with NO3 was found to be less important for particle-phase organic nitrate formation. The nitrogen content of SOA particles decreased slightly upon increase of relative humidity up to 80%. The experiments show a tight correlation between organic nitrate content and SOA particle-number concentrations, implying that the condensing organic nitrates are among the extremely low volatility organic compounds (ELVOC) that may play an important role in the nucleation and growth of atmospheric nanoparticles"
Keywords:		*Aerosols Air Pollutants/*chemistry Monoterpenes/chemistry Nitrates/chemistry Ozone/chemistry Particle Size Volatile Organic Compounds/chemistry;
Notes:		"MedlineBerkemeier, Thomas Ammann, Markus Mentel, Thomas F Poschl, Ulrich Shiraiwa, Manabu eng Research Support, Non-U.S. Gov't 2016/05/25 Environ Sci Technol. 2016 Jun 21; 50(12):6334-42. doi: 10.1021/acs.est.6b00961. Epub 2016 Jun 7"