Articles | Volume 24, issue 7
https://doi.org/10.5194/acp-24-4411-2024
https://doi.org/10.5194/acp-24-4411-2024
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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Cited articles

Acker, K., Möller, D., Wieprecht, W., Meixner, F. X., Bohn, B., Gilge, S., Plass-Dülmer, C., and Berresheim, H.: Strong daytime production of OH from HNO2 at a rural mountain site, Geophys. Res. Lett., 33, L02809, https://doi.org/10.1029/2005GL024643, 2006. 
Anastasio, C., Faust, B., and Allen, J.: Aqueous phase photochemical formation of hydrogen peroxide in authentic cloud waters, J. Geophys. Res.-Atmos., 99, 8231–8248, https://doi.org/10.1029/94JD00085, 1994. 
Armbruster, D. A. and Pry, T.: Limit of Blank, Limit of Detection and Limit of Quantitation, Clin. Biochem. Rev., 29, S49–S52, 2008. 
Benedict, K. B., McFall, A. S., and Anastasio, C.: Quantum Yield of Nitrite from the Photolysis of Aqueous Nitrate above 300 nm, Environ. Sci. Technol., 51, 4387–4395, https://doi.org/10.1021/acs.est.6b06370, 2017. 
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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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