Preprints
https://doi.org/10.5194/amt-2021-102
https://doi.org/10.5194/amt-2021-102

  23 Apr 2021

23 Apr 2021

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

Development of a Laser-Photofragmentation Laser-Induced Fluorescence instrument for the detection of nitrous acid and hydroxyl radicals in the atmosphere

Brandon Bottorff1, Emily Reidy1, Levi Mielke2,a, Sebastien Dusanter2,b, and Philip Stevens1,2 Brandon Bottorff et al.
  • 1Department of Chemistry, Indiana University, Bloomington, IN, 47405, USA
  • 2O’Neill School of Public and Environmental Affairs, Indiana University, Bloomington, IN, 47405, USA
  • anow at: Department of Chemistry, University of Indianapolis, Indianapolis, IN, 46227, USA
  • bnow at: IMT Lille Douai, Institut Mines -Télécom, Univ. Lille, Centre for Energy and Environment, F-59000 Lille, France

Abstract. A new instrument for the measurement of atmospheric nitrous acid (HONO) and hydroxyl radicals (OH) has been developed using laser photofragmentation (LP) of HONO at 355 nm after expansion into a low-pressure cell, followed by resonant laser-induced fluorescence (LIF) of the resulting OH radical fragment at 308 nm similar to the fluorescence assay by gas expansion technique (FAGE). The LP/LIF instrument is calibrated by determining the photo-fragmentation efficiency of HONO. In this method, a known concentration of OH from the photo-dissociation of water vapor is titrated with nitric oxide to produce a known concentration of HONO. Measurement of the concentration of the OH radical fragment relative to the concentration of HONO provides a measurement of the photo-fragmentation efficiency. The LP/LIF instrument has demonstrated a 1σ detection limit of 9 ppt for a 10-min integration time. Ambient measurements of HONO and OH from a forested environment and an urban setting are presented along with indoor measurements to demonstrate the performance of the instrument.

Brandon Bottorff et al.

Status: open (until 18 Jun 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-102', Anonymous Referee #1, 04 May 2021 reply

Brandon Bottorff et al.

Brandon Bottorff et al.

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Short summary
Nitrous acid (HONO) is an important source of hydroxyl (OH) radicals, the primary oxidant in the atmosphere. Accurate measurements of HONO are thus important to understand the oxidative capacity of the atmosphere. A new instrument capable of measuring atmospheric nitrous acid (HONO) with high sensitivity is presented, utilizing laser photofragmentation of ambient HONO and subsequent detection of the OH radical fragment.