Preprints
https://doi.org/10.5194/amt-2022-295
https://doi.org/10.5194/amt-2022-295
 
11 May 2022
11 May 2022

Temperature dependent sensitivity of iodide chemical ionization mass spectrometers

Michael A. Robinson1,2,3, J. Andrew Neuman1,2, L. Gregory Huey4, James M. Roberts1, Steven S. Brown1,3, and Patrick R. Veres1 Michael A. Robinson et al.
  • 1NOAA Chemical Sciences Laboratory, Boulder, Colorado, USA
  • 2Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, Colorado, USA
  • 3Department of Chemistry, University of Colorado Boulder, Boulder, Colorado, USA
  • 4School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA

Abstract. Iodide chemical ionization mass spectrometry (CIMS) is a common analytical tool used in both laboratory and field experiments to measure a large suite of atmospherically relevant compounds. Here, we describe a systematic ion molecule reactor (IMR) temperature dependence of iodide CIMS analyte sensitivity for a wide range of analytes in laboratory experiments. Weakly bound iodide clusters such as HCl, HONO, HCOOH, HCN, phenol, 2-nitrophenol and acyl peroxy nitrate (PAN) detected via the peroxy radical cluster, all exhibit strong IMR temperature dependence of sensitivity ranging from -3.4 to 5.9 % °C-1 (from 37 to 47 °C). Strongly bound iodide clusters such as Br2, N2O5, ClNO2, and PAN detected via the carboxylate anion all exhibit little to no IMR temperature dependence ranging from 0.2 to -0.9 % °C-1 (from 37 to 47 °C). The IMR temperature relationships of weakly bound clusters provide an estimate of net reaction enthalpy and comparison with database values, indicating these clusters are in thermal equilibrium. Ground site HCOOH data collected in the summer of 2021 in Pasadena, CA are corrected showing a reversal in the diel cycle, emphasizing the importance of this correction (35 ± 6 % during the day, -26 ± 2 % at night). Finally, we recommend two approaches to minimizing this effect in the field, namely heating or cooling the IMR; the latter has the added benefit of improving absolute sensitivity and reducing drift in harsh field environments.

Journal article(s) based on this preprint

28 Jul 2022
Temperature-dependent sensitivity of iodide chemical ionization mass spectrometers
Michael A. Robinson, J. Andrew Neuman, L. Gregory Huey, James M. Roberts, Steven S. Brown, and Patrick R. Veres
Atmos. Meas. Tech., 15, 4295–4305, https://doi.org/10.5194/amt-15-4295-2022,https://doi.org/10.5194/amt-15-4295-2022, 2022
Short summary

Michael A. Robinson et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2022-295', Anonymous Referee #1, 01 Jun 2022
  • RC2: 'Comment on amt-2022-295', Anonymous Referee #2, 16 Jun 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2022-295', Anonymous Referee #1, 01 Jun 2022
  • RC2: 'Comment on amt-2022-295', Anonymous Referee #2, 16 Jun 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Michael A. Robinson on behalf of the Authors (12 Jul 2022)  Author's response    Author's tracked changes    Manuscript
ED: Publish as is (12 Jul 2022) by Hendrik Fuchs

Journal article(s) based on this preprint

28 Jul 2022
Temperature-dependent sensitivity of iodide chemical ionization mass spectrometers
Michael A. Robinson, J. Andrew Neuman, L. Gregory Huey, James M. Roberts, Steven S. Brown, and Patrick R. Veres
Atmos. Meas. Tech., 15, 4295–4305, https://doi.org/10.5194/amt-15-4295-2022,https://doi.org/10.5194/amt-15-4295-2022, 2022
Short summary

Michael A. Robinson et al.

Michael A. Robinson et al.

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Short summary
Iodide chemical ionization mass spectrometers (CIMS) are commonly used in atmospheric chemistry laboratory studies and field campaigns. Deployment of the NOAA iodide CIMS in the summer of 2021 indicated a significant and overlooked temperature dependence of instrument sensitivity. This work explores the analytes influenced by this phenomena. Additionally, we recommend controls to reduce this influence for field deployments in the future.