Using δ13 C of Levoglucosan As a Chemical Clock

Environmental Science & Technology
Iulia GenschA Kiendler-Scharr

Abstract

Compound specific carbon isotopic measurements (δ13C) of levoglucosan were carried out for ambient aerosol sampled during an intensive biomass burning period at different sites in Guangdong province, China. The δ13C of ambient levoglucosan was found to be noticeably heavier than the average δ13C of levoglucosan found in source C3-plant-combustion samples. To estimate the photochemical age of sampled ambient levoglucosan, back trajectory analyses were done. The origin and pathways of the probed air masses were determined, using the Lagrangian-particle-dispersion-model FLEXPART and ECMWF meteorological data. On the other hand, the isotopic hydrocarbon clock concept was applied to relate the changes in the field-measured stable carbon isotopic composition to the extent of chemical processing during transport. Comparison of the photochemical age derived using these two independent approaches shows on average good agreement, despite a substantial scatter of the individual data pairs. These analyses demonstrate that the degree of oxidative aging of particulate levoglucosan can be quantified by combining laboratory KIE studies, observed δ13C at the source and in the field, as well as back trajectory analyses. In this study, the chemic...Continue Reading

References

Jan 30, 2007·Environmental Science & Technology·Allen L RobinsonWolfgang F Rogge
May 24, 2008·Environmental Science & Technology·Daniele FabbriBernd R T Simoneit
Feb 9, 2012·Environmental Science & Technology·Xue F SangA Kiendler-Scharr
Jan 31, 2014·Environmental Science and Pollution Research International·B L van DroogeJ O Grimalt
May 11, 2015·The Science of the Total Environment·D ParaskevopoulouN Mihalopoulos
Dec 16, 2017·Environmental Science & Technology·Caiqing YanJeffrey L Collett

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