Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 24, issue 7
Articles | Volume 24, issue 7
https://doi.org/10.5194/acp-24-4411-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-24-4411-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 24, issue 7
Technical note
 | 
16 Apr 2024
Technical note |  | 16 Apr 2024

Technical Note: A technique to convert NO2 to NO2− with S(IV) and its application to measuring nitrate photolysis

Aaron Lieberman, Julietta Picco, Murat Onder, and Cort Anastasio

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Latest update: 01 Apr 2025
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Short summary
We developed a method that uses aqueous S(IV) to quantitatively convert NO2 to NO2−, which allows both species to be quantified using the Griess method. As an example of the utility of the method, we quantified both photolysis channels of nitrate, with and without a scavenger for hydroxyl radical (·OH). The results show that without a scavenger, ·OH reacts with nitrite to form nitrogen dioxide, suppressing the apparent quantum yield of NO2− and enhancing that of NO2.
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