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Evaluation of the Salicylic Acid - Liquid Phase Scrubbing Technique to Monitor Atmospheric Hydroxyl Radicals

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posted on 2023-06-22, 09:40 authored by Rhian SalmonRhian Salmon, C Schiller, G Harris
A novel method has been examined for monitoring tropospheric hydroxyl radicals (OH), the most important oxidant in tropospheric chemistry. Aqueous phase salicylic acid reacts with atmospheric OH to produce 2,5-dihydroxy benzoic acid (2,5-DHBA) and other products. High Performance Liquid Chromatography (HPLC) is used to separate the post-reaction solution and the products are quantified using fluorescence detection. Unlike other methods, it has been reported to be inexpensive, portable and relatively simple. Although the sensitivity was sufficient to measure typical daytime OH concentrations of 0.04-0.4 ppt., the method was hindered by numerous interferences. Successive identification and elimination of these still resulted in a signal that was much larger than expected. Tests showed that this was not likely to be due to ozone, HO2, NOx, H2O2, aerosols, light or bacteria. Experimental and numerical studies suggest that the interference could be due to methyl peroxy radicals. The effect of many other components in the atmosphere, both individual and combined, must also be tested before the method can be used reliably in the field. The validity of previous reports of ambient hydroxyl measurements using this technique is therefore brought into question. © 2004 Kluwer Academic Publishers.

History

Preferred citation

Salmon, R., Schiller, C. & Harris, G. (2004). Evaluation of the Salicylic Acid - Liquid Phase Scrubbing Technique to Monitor Atmospheric Hydroxyl Radicals. Journal of Atmospheric Chemistry, 48(1), 81-104. https://doi.org/10.1023/B:JOCH.0000034516.95400.c3

Journal title

Journal of Atmospheric Chemistry

Volume

48

Issue

1

Publication date

2004-01-01

Pagination

81-104

Publisher

Springer Science and Business Media LLC

Publication status

Published

Contribution type

Article

ISSN

0167-7764

Language

en