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Stable bromine isotopic composition of methyl bromide released from plant matter
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för tillämpad miljövetenskap (ITM).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för tillämpad miljövetenskap (ITM).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologiska vetenskaper.ORCID-id: 0000-0002-5640-6419
Vise andre og tillknytning
2014 (engelsk)Inngår i: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 125, s. 186-195Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Methyl bromide (CH3Br) emitted from plants constitutes a natural source of bromine to the atmosphere, and is a component in the currently unbalanced global CH3Br budget. In the stratosphere, CH3Br contributes to ozone loss processes. Studies of stable isotope composition may reduce uncertainties in the atmospheric CH3Br budget, but require well-constrained isotope fingerprints of the source end members. Here we report the first measurements of stable bromine isotopes (delta Br-81) in CH3Br from abiotic plant emissions. Incubations of both KBr-fortified pectin, a ubiquitous cell-stabilizing macromolecule, and of a natural halophyte (Salicornia fruticosa), yielded an enrichment factor (epsilon) of -2.00 +/- 0.23 parts per thousand (1 sigma, n = 8) for pectin and -1.82 +/- 0.02 parts per thousand (1 sigma, n = 4) for Salicornia (the relative amount of the heavier Br-81 was decreased in CH3Br compared to the substrate salt). For short incubations, and up to 10% consumption of the salt substrate, this isotope effect was similar for temperatures from 30 up to 300 degrees C. For longer incubations of up to 90 h at 180 degrees C the delta Br-81 values increased from -2 parts per thousand to 0 parts per thousand for pectin and to -1 parts per thousand for Salicornia. These delta Br-81 source signatures of CH3Br formation from plant matter combine with similar data for carbon isotopes to facilitate multidimensional isotope diagnostics of the CH3Br budget.

sted, utgiver, år, opplag, sider
2014. Vol. 125, s. 186-195
Emneord [en]
bromine, isotope, plants, atmosphere, methyl bromide
HSV kategori
Forskningsprogram
tillämpad miljövetenskap; miljökemi
Identifikatorer
URN: urn:nbn:se:su:diva-89403DOI: 10.1016/j.gca.2013.10.016ISI: 000329066500012OAI: oai:DiVA.org:su-89403DiVA, id: diva2:617739
Tilgjengelig fra: 2013-04-24 Laget: 2013-04-24 Sist oppdatert: 2019-12-12bibliografisk kontrollert
Inngår i avhandling
1. Stable bromine isotopic composition of methyl bromide: Method development and applications
Åpne denne publikasjonen i ny fane eller vindu >>Stable bromine isotopic composition of methyl bromide: Method development and applications
2013 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The isotopic composition of ozone depleting methyl halides may provide valuable information on the sources and sinks of these compounds. However, so far mostly stable carbon isotope analysis of methyl chloride and methyl bromide (CH3Br) has been attempted. Especially halogen isotope analysis has been hindered by the challenge to obtain sufficiently large amounts of methyl halides to meet the detection limits of existing isotope analytical methods. The purpose of this doctoral thesis was to develop both a high-volume cryogenic collection system for methyl bromide (Article II) and an analytical technique being able to analyze the sampled amounts of CH3Br for its Br isotopic composition, which was accomplished by using gas chromatography multiple-collector inductively-coupled plasma mass spectrometry (Article I). These methods were applied in the field campaign from which we report the first bromine isotopic values of CH3Br in the atmosphere (Article III), being in the range of -0.47 to + 1.75 ‰ vs. SMOB (Standard Mean Ocean Bromide). A laboratory study on pectin and halophyte plant material (Article IV) gave an insight in Br isotope composition of abiotically formed CH3Br which may be a main source to the atmospheric budget. These plant experiments yielded δ81Br values of 0 to -2 ‰ SMOB. Atmospheric CH3Br and this potential source showed partly distinct δ81Br ranges and demonstrate the potential of Br isotopes for source apportionment.

sted, utgiver, år, opplag, sider
Stockholm: Department of Applied Environmental Science (ITM), Stockholm University, 2013. s. 26
HSV kategori
Forskningsprogram
tillämpad miljövetenskap
Identifikatorer
urn:nbn:se:su:diva-89454 (URN)978-91-7447-705-4 (ISBN)
Disputas
2013-06-04, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Accepted. Paper 3: Submited. Paper 4: Manuscript.

Tilgjengelig fra: 2013-05-13 Laget: 2013-04-25 Sist oppdatert: 2017-11-23bibliografisk kontrollert

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