Articles | Volume 14, issue 8
https://doi.org/10.5194/amt-14-5319-2021
https://doi.org/10.5194/amt-14-5319-2021
Research article
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03 Aug 2021
Research article | Highlight paper |  | 03 Aug 2021

Iodide CIMS and mz 62: the detection of HNO3 as NO3 in the presence of PAN, peroxyacetic acid and ozone

Raphael Dörich, Philipp Eger, Jos Lelieveld, and John N. Crowley

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Latest update: 20 May 2024
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Short summary
We demonstrate in laboratory experiments that the formation of IOx anions (formed in reactions of I with O3) or acetate anions (formed e.g. by the reaction of I with peracetic acid) results in unexpected sensitivity of an iodide chemical ionisation mass spectrometer (I-CIMS) to HNO3 at a mass-to-charge ratio of 62. This helps explain observations of apparent high daytime levels of N2O5. Airborne measurements using I-CIMS confirm these conclusions.