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Nitrogen isotope fractionation during gas-to-particle conversion of NOx to NO3- in the atmosphere - implications for isotope-based NOx source apportionment
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID
4495123
Author(s)
Chang, Y. H.; Zhang, Y. L.; Tian, C. G.; Zhang, S. C.; Ma, X. Y.; Cao, F.; Liu, X. Y.; Zhang, W. Q.; Kuhn, T.; Lehmann, M. F.
Nitrogen isotope fractionation during gas-to-particle conversion of NOx to NO3- in the atmosphere - implications for isotope-based NOx source apportionment
Journal
Atmospheric Chemistry and Physics
Volume
18
Number
16
Pages / Article-Number
11647-11661
Abstract
Atmospheric fine-particle (PM 2 . 5 ) pollution is fre- quently associated with the formation of particulate nitrate ( p NO − 3 ), the end product of the oxidation of NO x gases (NO + NO 2 ) in the upper troposphere. The application of sta- ble nitrogen (N) (and oxygen) isotope analyses of p NO − 3 to constrain NO x source partitioning in the atmosphere requires knowledge of the isotope fractionation during the reactions leading to nitrate formation. Here we determined the δ 15 N values of fresh p NO − 3 ( δ 15 N- p NO − 3 ) in PM 2 . 5 at a rural site in northern China, where atmospheric p NO − 3 can be at- tributed exclusively to biomass burning. The observed δ 15 N- p NO − 3 (12 . 17 ± 1 . 55 ‰; n = 8) was much higher than the N isotopic source signature of NO x from biomass burning (1 . 04 ± 4 . 13 ‰). The large difference between δ 15 N- p NO − 3 and δ 15 N-NO x (
