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Published June 15, 2011 | Supplemental Material
Journal Article Open

Measurements of Isoprene-Derived Organosulfates in Ambient Aerosols by Aerosol Time-of-Flight Mass Spectrometry - Part 1: Single Particle Atmospheric Observations in Atlanta


Organosulfate species have recently been identified as a potentially significant class of secondary organic aerosol (SOA) species, yet little is known about their behavior in the atmosphere. In this work, organosulfates were observed in individual ambient aerosols using single particle mass spectrometry in Atlanta, GA during the 2002 Aerosol Nucleation and Characterization Experiment (ANARChE) and the 2008 August Mini-Intensive Gas and Aerosol Study (AMIGAS). Organosulfates derived from biogenically produced isoprene were detected as deprotonated molecular ions in negative-ion spectra measured by aerosol time-of-flight mass spectrometry; comparison to high-resolution mass spectrometry data obtained from filter samples corroborated the peak assignments. The size-resolved chemical composition measurements revealed that organosulfate species were mostly detected in submicrometer aerosols and across a range of aerosols from different sources, consistent with secondary reaction products. Detection of organosulfates in a large fraction of negative-ion ambient spectra − ca. 90−95% during ANARChE and ~65% of submicrometer particles in AMIGAS − highlights the ubiquity of organosulfate species in the ambient aerosols of biogenically influenced urban environments.

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© 2011 American Chemical Society. Published In Issue June 15, 2011; Article ASAP May 23, 2011; Received: November 24, 2010; Accepted: April 14, 2011; Revised: April 08, 2011. Stephanie Shaw and Eladio Knipping (EPRI) are gratefully acknowledged for coordinating the AMIGAS campaign. The authors thank the Prather group for extensive support throughout the studies. Additional assistance in Atlanta from Jerry Brown (ARA, Inc.) during AMIGAS was appreciated. Michele Sipin is acknowledged for assisting with data collection during ANARChE. We are grateful to Nathan Eddingsaas (Caltech) and Prof. Frank Keutsch (UW-Madison) for providing the BEPOX-derived and glycolic acid-derived organosulfate standards, respectively. ANARChE was supported by the University of Rochester EPA PM Center, Grant R827354. AMIGAS was funded by the Electric Power Research Institute. L. Hatch has been funded by a National Science Foundation Graduate Research Fellowship (2008-2011).

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