Preprints
https://doi.org/10.5194/amt-2021-35
https://doi.org/10.5194/amt-2021-35

  23 Mar 2021

23 Mar 2021

Review status: this preprint is currently under review for the journal AMT.

Utilizing an Electrical Low Pressure Impactor to Indirectly Probe Water Uptake via Particle Bounce Measurements 

Kevin B. Fischer and Giuseppe A. Petrucci Kevin B. Fischer and Giuseppe A. Petrucci
  • Department of Chemistry, The University of Vermont, Burlington, VT, 05405, USA

Abstract. Secondary organic aerosol (SOA), formed through oxidation of volatile organic compounds (VOCs), display complex viscosity and phase behaviors influenced by temperature, relative humidity (RH), and chemical composition. Here, the efficacy of a multi-stage electrical low pressure impactor (ELPI) for indirect water uptake measurements was studied for ammonium sulfate (AS) aerosol, sucrose aerosol, and α-pinene derived SOA. All three aerosol systems were subjected to greater than 90 % chamber relative humidity, with subsequent analysis indicating persistence of particle bounce for sucrose 10 aerosol of 70 nm (initial dry diameter) and α-pinene derived SOA of number geometric mean diameters between 39 nm and 136 nm (initial dry diameter). On the other hand, sucrose aerosol of 190 nm (initial dry diameter) and AS aerosol down to 70 nm (initial dry diameter) exhibited no particle bounce at elevated RH. Partial drying of aerosol within the lower diameter ELPI impaction stages, where inherent and significant RH reductions occur, is proposed as one explanation for particle bounce persistence.

Kevin B. Fischer and Giuseppe A. Petrucci

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-35', Anonymous Referee #1, 10 Apr 2021
    • CC1: 'Reply on RC1', Kevin Fischer, 25 Apr 2021
    • AC2: 'Reply on RC1', Giuseppe Petrucci, 01 Jul 2021
  • RC2: 'Comment on amt-2021-35', Anonymous Referee #3, 02 Jun 2021

Kevin B. Fischer and Giuseppe A. Petrucci

Kevin B. Fischer and Giuseppe A. Petrucci

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Short summary
The viscosity of organic particles in atmospheric aerosol is sometimes correlated to bounce factor. It is generally accepted that more viscous particles will be more likely to bounce following acceleration toward and impaction on a surface. We demonstrate that use of multi-stage low-pressure impactors for this purpose may result in measurement artifacts that depend on chemical composition, particle size and changing relative humidity. A hypothesis for the observed effect is presented.