Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions
International audience Volcanic 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. With an area of 103,000 km 2 , Iceland is...
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ftunivnantes:oai:HAL:hal-03158536v1 2023-05-15T16:52:52+02:00 Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions Urupina, Darya Romanias, Manolis Thevenet, Frederic Lasne, Jerome Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai) Institut Mines-Télécom Paris (IMT) Vienne, Austria 2020-05-04 https://hal.science/hal-03158536 https://doi.org/10.5194/egusphere-egu2020-530 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu2020-530 hal-03158536 https://hal.science/hal-03158536 doi:10.5194/egusphere-egu2020-530 EGU General Assembly https://hal.science/hal-03158536 EGU General Assembly, May 2020, Vienne, Austria. ⟨10.5194/egusphere-egu2020-530⟩ [SDE]Environmental Sciences info:eu-repo/semantics/conferenceObject Conference papers 2020 ftunivnantes https://doi.org/10.5194/egusphere-egu2020-530 2023-03-08T03:13:17Z International audience Volcanic 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. With an area of 103,000 km 2 , Iceland is the biggest volcanic desert on earth. It was chosen as a case study due to frequency of volcanic eruptions and high aeolian activity in the area. This is a comprehensive study of the heterogeneous reactivity of Icelandic volcanic dust with sulfur dioxide (SO 2 ) gas. First, we focused on the kinetics of the reaction of SO 2 with natural v-dust samples under atmospheric conditions using coated wall flow tube reactor. Steady-state uptake coefficients were measured to represent the long-term phenomena of the processing of aerosols in the atmosphere and the values obtained can be directly incorporated in chemical transport modeling. Second, the mechanism of the reaction of SO 2 with natural v-dust samples was studied using infrared Fourier transform spectroscopy (DRIFTS). Both sulfites and sulfates were observed on the surface of v-dust, with sulfates being the final oxidation product, attesting to SO 2 heterogeneous reactivity. Surface hydroxyl groups were found to play a crucial role in the conversion of SO 2 to sulfates as evidenced from both flow tube and DRIFTS experiments. Based on these experimental results, a mechanism for SO 2 interaction with different surface sites of v-dust was proposed and discussed. Third, in order to monitor the amount of sulfites and sulfates formed on the surface of mineral dusts of different origins a simple, accurate and precise reversed-phase liquid chromatography method was developed and validated to stabilize and analyze sulfites and sulfates in the extract of dusts exposed to SO 2 . Besides SO 2 gas, v-dust reacts with other atmospheric pollutants, such as NO 2 and O 3 , proving that heterogeneous processes play an important role in the atmospheric chemistry. One must keep in mind ... Conference Object Iceland Université de Nantes: HAL-UNIV-NANTES |
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Université de Nantes: HAL-UNIV-NANTES |
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[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Urupina, Darya Romanias, Manolis Thevenet, Frederic Lasne, Jerome Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Volcanic 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. With an area of 103,000 km 2 , Iceland is the biggest volcanic desert on earth. It was chosen as a case study due to frequency of volcanic eruptions and high aeolian activity in the area. This is a comprehensive study of the heterogeneous reactivity of Icelandic volcanic dust with sulfur dioxide (SO 2 ) gas. First, we focused on the kinetics of the reaction of SO 2 with natural v-dust samples under atmospheric conditions using coated wall flow tube reactor. Steady-state uptake coefficients were measured to represent the long-term phenomena of the processing of aerosols in the atmosphere and the values obtained can be directly incorporated in chemical transport modeling. Second, the mechanism of the reaction of SO 2 with natural v-dust samples was studied using infrared Fourier transform spectroscopy (DRIFTS). Both sulfites and sulfates were observed on the surface of v-dust, with sulfates being the final oxidation product, attesting to SO 2 heterogeneous reactivity. Surface hydroxyl groups were found to play a crucial role in the conversion of SO 2 to sulfates as evidenced from both flow tube and DRIFTS experiments. Based on these experimental results, a mechanism for SO 2 interaction with different surface sites of v-dust was proposed and discussed. Third, in order to monitor the amount of sulfites and sulfates formed on the surface of mineral dusts of different origins a simple, accurate and precise reversed-phase liquid chromatography method was developed and validated to stabilize and analyze sulfites and sulfates in the extract of dusts exposed to SO 2 . Besides SO 2 gas, v-dust reacts with other atmospheric pollutants, such as NO 2 and O 3 , proving that heterogeneous processes play an important role in the atmospheric chemistry. One must keep in mind ... |
author2 |
Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai) Institut Mines-Télécom Paris (IMT) |
format |
Conference Object |
author |
Urupina, Darya Romanias, Manolis Thevenet, Frederic Lasne, Jerome |
author_facet |
Urupina, Darya Romanias, Manolis Thevenet, Frederic Lasne, Jerome |
author_sort |
Urupina, Darya |
title |
Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions |
title_short |
Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions |
title_full |
Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions |
title_fullStr |
Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions |
title_full_unstemmed |
Uptake and surface chemistry of SO2 on natural Icelandic volcanic dusts under simulated atmospheric conditions |
title_sort |
uptake and surface chemistry of so2 on natural icelandic volcanic dusts under simulated atmospheric conditions |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03158536 https://doi.org/10.5194/egusphere-egu2020-530 |
op_coverage |
Vienne, Austria |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
EGU General Assembly https://hal.science/hal-03158536 EGU General Assembly, May 2020, Vienne, Austria. ⟨10.5194/egusphere-egu2020-530⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu2020-530 hal-03158536 https://hal.science/hal-03158536 doi:10.5194/egusphere-egu2020-530 |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-530 |
_version_ |
1766043333202804736 |