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Environ Sci Technol

Title:		Secondary organic aerosol from ozonolysis of biogenic volatile organic compounds: chamber studies of particle and reactive oxygen species formation
Author(s):		Chen X; Hopke PK; Carter WP;
Address:		"Center for Air Resources Engineering and Science, Clarkson University, Potsdam, New York 13699-5708, USA"
Journal Title:		Environ Sci Technol
Year:		2011
Volume:		20101201
Issue:		1
Page Number:		276 - 282
DOI:		10.1021/es102166c
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"The formation of secondary organic aerosol (SOA) produced from alpha-pinene, linalool, and limonene by ozonolysis was examined using a dynamic chamber system that allowed the simulation of ventilated indoor environments. Experiments were conducted at typical room temperatures and air exchange rates. Limonene ozonolysis produced the highest SOA mass concentrations and linalool the lowest with alpha-pinene being intermediate. Simplified empirical modeling simulations were conducted to provide insights into reaction chemistry. Assessment of variability of particle-bound reactive oxygen species (ROS) may be important in the understanding of health effects associated with particulate matter. The ROS intensities defined as ROS/SOA mass were found to be moderately correlated with the SOA densities. Greater ROS intensities were observed for the cases where ozone was in excess. ROS intensities approached a relatively constant value in the region where ozone was in deficit. The estimated initial ROS half-life time was approximately 6.5 h at room temperature suggesting the time sensitivity of ROS measurements. The ROS formed from terpenoid ozonolysis could be separated into three categories: short-lived/high reactive/volatile, semivolatile/relatively stable and nonvolatile/low reactive species based on ROS measurements under various conditions. Such physical characterization of the ROS in terms of reactivity and volatility provides some insights into the nature of ROS"
Keywords:		"Acyclic Monoterpenes Aerosols/analysis/*chemistry Air Pollutants/analysis/*chemistry Air Pollution, Indoor Bicyclic Monoterpenes Cyclohexenes/analysis/chemistry Green Chemistry Technology Limonene Monoterpenes/analysis/chemistry Ozone/analysis/*chemistry;"
Notes:		"MedlineChen, Xi Hopke, Philip K Carter, William P L eng Research Support, U.S. Gov't, Non-P.H.S. 2010/12/03 Environ Sci Technol. 2011 Jan 1; 45(1):276-82. doi: 10.1021/es102166c. Epub 2010 Dec 1"