Analyzing SPARTAN filters with an Aerosol Mass Spectrometer Rachel O’Brien, Kelsey Ridley, Jesse Kroll Department of Civil and Environmental Engineering, MIT Manjula Canagaratna, John Jayne, Philip Croteau, Aerodyne Research, Inc. June 9, 2015

High Resolution-TOF-AMS Aerosol Mass Spectrometer with a Time of Flight mass spectrometer Measure refractory aerosol species Resolution  ~ 2-3k m/  m

AMS studies worldwide… costly deployment, few long term data sets Zhang et al., 2007 organic sulfate nitrate ammonium

Filters and off-line analysis Global filter networks  long term data sets, lower deployment cost, more remote and difficult locations Filter extracts  small sample volumes

Small Volume Nebulizer (SVN) design Minimum concentration ~0.15 g L -1 (20-30  g into ~100  L to be above LOD) Clean house air Kapton Polyimide film AMS Ultrasonic transducer

Good correlation with commercial atomizer TSI Atomizer SVN TSI Atomizer SVN

Inter-instrument comparison Filter extract (AMS) Filter extract (ACSM) m/z Normalize relative intensity ACSM AMS

HR-MS from Bandung, Indonesia: August 19-20, 2014 Org SO 4 NO 3 NH 4 O/C = 0.6 Org/SO 4 = ~6

Future development Continuous injection Add automation, improve sensitivity Addition of internal standard Mass quantification Orthogonal analyses– UV/Vis, fluorescence, etc. Syringe pump AMS

Conclusions The SVN can be used to generate AMS spectra from SPARTAN filters: Ensemble organic composition, O/C Need >  g of sample Extract filters in water Ongoing development to improve utility of the SVN: Quantification Increased sensitivity Orthogonal analyses

Acknowledgments Kelsey Ridley, Jesse Kroll and the Kroll group Manjula Canagaratna, John Jayne, Philip Croteau, and Aerodyne Research, Inc.