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Uptake and surface chemistry of SO2 on natural volcanic dusts

Uptake and surface chemistry of SO2 on natural volcanic dusts

Title: Uptake and surface chemistry of SO2 on natural volcanic dusts
Author: Urupina, Darya
Lasne, Jerome   orcid.org/0000-0002-9375-8560
romanias, manolis   orcid.org/0000-0002-9049-0319
Thiery, Vincent   orcid.org/0000-0002-1384-6000
Dagsson-Waldhauserova, Pavla   orcid.org/0000-0001-6368-2369
THEVENET, Frederic   orcid.org/0000-0002-9951-0849
Date: 2019-11
Language: English
Scope: 116942
University/Institute: Landbúnaðarháskóli Íslands
Agricultural University of Iceland
Department: Auðlinda- og umhverfisdeild (LBHÍ)
Faculty of Natural Resources and Environmental Sciences (AUI)
Series: Athmosperic Environment;217
ISSN: 1352-2310
DOI: doi.org/10.1016/j.atmosenv.2019.116942
Subject: Atmospheric Science; Sulfur dioxide; Brennisteinsdíoxíð; Aska; Loftslag
URI: https://hdl.handle.net/20.500.11815/1349

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Urupina, D., Lasne, J., Romanias, M. N., Thiery, V., Dagsson-Waldhauserova, P., & Thevenet, F. (2019). Uptake and surface chemistry of SO2 on natural volcanic dusts. Atmospheric Environment, 217, 116942.


V-dust (v-dust) is a highly variable source of natural particles in the atmosphere, and during the period of high volcanic activity it can provide a large surface for heterogeneous interactions with other atmospheric compounds. Icelandic v-dust was chosen as a case study due to frequency of volcanic eruptions and high aeolian activity in the area. In this study, we focus on the kinetics and mechanism of the reaction of sulfur dioxide (SO2) with natural v-dust samples under atmospheric conditions using coated wall flow tube reactor and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Steady state uptake coefficients determined are in the range of 10−9 to 10−8 depending on the considered v-dust. Concomitantly with SO2 uptake, both sulfites and sulfates are monitored on the surface of v-dust, with sulfates being the final oxidation product, attesting of SO2 surface reaction. Surface hydroxyl groups play a crucial role in the conversion of SO2 to sulfites as evidenced from both flow tube and DRIFTS experiments. Based on these experimental results, a mechanism for SO2 interaction with different surface sites of v-dust is proposed and discussed. This study provides original insights in the kinetics of SO2 uptake under simulated atmospheric conditions and its mechanism and transformation on volcanic material. To that regards, it brings an accurate perspective on SO2 heterogeneous sinks in the atmosphere.

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