No evidence for S isotape fractionation during SO2 oxidation at a continental location

Introduction Sulfur isotope fractionation during SO2 oxidation has been shown to occur in laboratory experiments [1] but this has not been observed in whole air samples [2]. Here we replicate the laboratory experiments in a systematic manner using ambient air. Methods Particulate matter and SO2 in a...

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Main Authors: Kolodziej, J., Norman, A.L., Rempillo, Ofelia T.
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Published: Animo Repository 2014
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Online Access:https://animorepository.dlsu.edu.ph/faculty_research/10833
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spelling oai:animorepository.dlsu.edu.ph:faculty_research-130782025-02-05T05:17:08Z No evidence for S isotape fractionation during SO2 oxidation at a continental location Kolodziej, J. Norman, A.L. Rempillo, Ofelia T. Introduction Sulfur isotope fractionation during SO2 oxidation has been shown to occur in laboratory experiments [1] but this has not been observed in whole air samples [2]. Here we replicate the laboratory experiments in a systematic manner using ambient air. Methods Particulate matter and SO2 in ambient air were collected at Calgary in the fall of 2012 using high volume samplers and impingers. Atmospheric SO2 and SO­4 concentrations and isotope characteristics were determined. Results Variations in concentrations did not reflect changes in δ34S values, suggesting the independence of δ34S from SO2 and SO4 concentrations in the atmosphere. d34SSO2 values for high volume samples was, on average, +13.2‰ ± 0.2‰. SO2 from the impinger method over the same sampling period yielded a δ34SSO2 value of +14.0‰ ± 0.2‰. δ34SSO4 values ranged from +9.9‰ ± 0.5‰ to +15.3‰ ± 0.2‰. Discussion and Conclusions δ34SSO2 values from the high volume and impinger samples were similar (+13.2‰ versus +14.0‰, respectively) and shows d34S values from these collection methods are equivalent. Differences between the impinger and high volume sampler d34S values for SO2 and submicron aerosol sulfate were used to gauge sulfur isotope fractionation. Standard deviations for differences were greater than averages (Δd34SSO2 avg.= -0.80‰, s=1.76‰; fine Δd34SSO4 avg.=+0.28‰, s=5.15‰), indicating little to no fractionation. Additionally, δ34SSO2 and δ34SSO4 values were compared to the maximum percent SO2 that may have reacted to form SO4. No pattern was evident so the conclusion is that sulfur isotope fractionation in ambient air is negligible under the conditions sampled. 2014-01-01T08:00:00Z text https://animorepository.dlsu.edu.ph/faculty_research/10833 Faculty Research Work Animo Repository Sulfur—Isotopes Sulfur--Oxidation Physical Sciences and Mathematics
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
topic Sulfur—Isotopes
Sulfur--Oxidation
Physical Sciences and Mathematics
spellingShingle Sulfur—Isotopes
Sulfur--Oxidation
Physical Sciences and Mathematics
Kolodziej, J.
Norman, A.L.
Rempillo, Ofelia T.
No evidence for S isotape fractionation during SO2 oxidation at a continental location
description Introduction Sulfur isotope fractionation during SO2 oxidation has been shown to occur in laboratory experiments [1] but this has not been observed in whole air samples [2]. Here we replicate the laboratory experiments in a systematic manner using ambient air. Methods Particulate matter and SO2 in ambient air were collected at Calgary in the fall of 2012 using high volume samplers and impingers. Atmospheric SO2 and SO­4 concentrations and isotope characteristics were determined. Results Variations in concentrations did not reflect changes in δ34S values, suggesting the independence of δ34S from SO2 and SO4 concentrations in the atmosphere. d34SSO2 values for high volume samples was, on average, +13.2‰ ± 0.2‰. SO2 from the impinger method over the same sampling period yielded a δ34SSO2 value of +14.0‰ ± 0.2‰. δ34SSO4 values ranged from +9.9‰ ± 0.5‰ to +15.3‰ ± 0.2‰. Discussion and Conclusions δ34SSO2 values from the high volume and impinger samples were similar (+13.2‰ versus +14.0‰, respectively) and shows d34S values from these collection methods are equivalent. Differences between the impinger and high volume sampler d34S values for SO2 and submicron aerosol sulfate were used to gauge sulfur isotope fractionation. Standard deviations for differences were greater than averages (Δd34SSO2 avg.= -0.80‰, s=1.76‰; fine Δd34SSO4 avg.=+0.28‰, s=5.15‰), indicating little to no fractionation. Additionally, δ34SSO2 and δ34SSO4 values were compared to the maximum percent SO2 that may have reacted to form SO4. No pattern was evident so the conclusion is that sulfur isotope fractionation in ambient air is negligible under the conditions sampled.
format text
author Kolodziej, J.
Norman, A.L.
Rempillo, Ofelia T.
author_facet Kolodziej, J.
Norman, A.L.
Rempillo, Ofelia T.
author_sort Kolodziej, J.
title No evidence for S isotape fractionation during SO2 oxidation at a continental location
title_short No evidence for S isotape fractionation during SO2 oxidation at a continental location
title_full No evidence for S isotape fractionation during SO2 oxidation at a continental location
title_fullStr No evidence for S isotape fractionation during SO2 oxidation at a continental location
title_full_unstemmed No evidence for S isotape fractionation during SO2 oxidation at a continental location
title_sort no evidence for s isotape fractionation during so2 oxidation at a continental location
publisher Animo Repository
publishDate 2014
url https://animorepository.dlsu.edu.ph/faculty_research/10833
_version_ 1823806976708050944