Coupling an online ion conductivity measurement with the particle-into-liquid sampler: Evaluation and modeling using laboratory and field aerosol data

Aerosol Science and Technology : the Journal of the American Association for Aerosol Research
Ewan CrosbieEdward Winstead

Abstract

A particle-into-liquid sampler (PILS) was coupled to a flow-through conductivity cell to provide a continuous, nondestructive, online measurement in support of offline ion chromatography analysis. The conductivity measurement provides a rapid assessment of the total ion concentration augmenting slower batch-sample data from offline analysis and is developed primarily to assist airborne measurements, where fast time-response is essential. A conductivity model was developed for measured ions and excellent closure was derived for laboratory-generated aerosols (97% conductivity explained, R2 > 0.99). The PILS-conductivity measurement was extensively tested throughout the NASA Cloud, Aerosol and Monsoon Processes: Philippines Experiment (CAMP2Ex) during nineteen research flights. A diverse range of ambient aerosol was sampled from biomass burning, fresh and aged urban pollution, and marine sources. Ambient aerosol did not exhibit the same degree of closure as the laboratory aerosol, with measured ions only accountable for 43% of the conductivity. The remaining fraction of the conductivity was examined in combination with ion charge balance and found to provide additional supporting information for diagnosing and modeling particle ac...Continue Reading

References

Feb 22, 2007·Environmental Science & Technology·Jason D SurrattJohn H Seinfeld
May 21, 2009·Environmental Science & Technology·Neeraj RastogiRodney J Weber
Sep 29, 2015·Journal of Geophysical Research. Atmospheres : JGR·Armin SorooshianRoy K Woods
Aug 5, 2018·Proceedings of the National Academy of Sciences of the United States of America·Christopher M KensethJohn H Seinfeld
Mar 5, 2019·Aerosol Science and Technology : the Journal of the American Association for Aerosol Research·Anna WonaschuetzRegina Hitzenberger

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PILS
CAMP

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