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Secondary organic aerosol from α‐pinene ozonolysis in dynamic chamber system
Author(s) -
Chen X,
Hopke P. K.
Publication year - 2009
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1111/j.1600-0668.2009.00596.x
Subject(s) - ozonolysis , aerosol , chemistry , particle (ecology) , scanning mobility particle sizer , pinene , ozone , reactive oxygen species , environmental chemistry , environmental chamber , radical , particulates , mass concentration (chemistry) , volume (thermodynamics) , particle size , analytical chemistry (journal) , particle size distribution , organic chemistry , ecology , physics , biochemistry , quantum mechanics , biology
The formation of secondary organic aerosol (SOA) produced from alpha-pinene ozonolysis was examined using a dynamic chamber system that allowed the simulation of ventilated indoor environments. Particle-bound reactive species (ROS) including peroxides, peroxy radicals and ions that could penetrate into the lungs and deliver oxidative stress to the tissue causing damage were quantitatively determined from filters collected from the chamber. ROS was determined using dichlorofluorescin such that resulting fluorescent intensities were converted to equivalent H(2)O(2) concentrations. Measured ROS concentrations at alpha-pinene and ozone concentrations relevant to prevailing indoor concentrations ranged from 1.1 to 7.2 nmol/m(3) of H(2)O(2). Particle density was also determined from scanning mobility particle sizer measurements and mass collected onto filters to obtain volume and mass concentration, respectively. Partitioning theory reveals the fact that with increased SOA mass loading, even for more volatile species, partitioning onto particle phase is favored relative to low SOA mass loadings. Other recent studies have found changes in composition of the SOA depending on the precursor VOC concentrations. This behavior was reflected in these experiments in terms of a change of density. Measured densities ranged from 1.07 to 1.69 g/cm(3).