Description: Chemical stability of levoglucosan: An isotopic perspective

This title appears in the Scientific Report : 2016

Chemical stability of levoglucosan: An isotopic perspective

The chemical stability of levoglucosan was studied by exploring its isotopic fractionation during the oxidation by hydroxyl radicals. Aqueous solutions as well as mixed (NH4)2SO4-levoglucosan particles were exposed to OH. In both cases, samples experiencing different extents of processing were isoto...

Personal Name(s):	Sang, X. F.
	Gensch, I. (Corresponding author) / Kammer, B. / Khan, A. / Kleist, E. / Laumer, W. / Schlag, P. / Schmitt, Sebastian / Wildt, J. / Zhao, R. / Mungall, E. L. / Abbatt, J. P. D. / Kiendler-Scharr, A.
Contributing Institute:	Pflanzenwissenschaften; IBG-2 Troposphäre; IEK-8
Published in:	Geophysical research letters, 43 (2016) 10, S. 5419 - 5424
Imprint:	Hoboken, NJ Wiley 2016
DOI:	10.1002/2016GL069179
Document Type:	Journal Article
Research Program:	Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Tropospheric trace substances and their transformation processes
Link:	OpenAccess OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://hdl.handle.net/2128/16072 in citations.
Please use the identifier: http://dx.doi.org/10.1002/2016GL069179 in citations.

The chemical stability of levoglucosan was studied by exploring its isotopic fractionation during the oxidation by hydroxyl radicals. Aqueous solutions as well as mixed (NH4)2SO4-levoglucosan particles were exposed to OH. In both cases, samples experiencing different extents of processing were isotopically analyzed by Thermal Desorption-Gas Chromatography-Isotope Ratio Mass Spectrometry (TD-GC-IRMS). From the dependence of levoglucosan δ13C and concentration on the reaction extent, the kinetic isotope effect (KIE) of the OH oxidation reactions was determined to be 1.00187±0.00027 and 1.00229±0.00018, respectively. Both show good agreement within the uncertainty range. For the heterogeneous oxidation of particulate levoglucosan by gas-phase OH, a reaction rate constant of (2.67±0.03)·10−12 cm3 molecule−1S−1 was derived. The laboratory kinetic data, together with isotopic source and ambient observations, give information on the extent of aerosol chemical processing in the atmosphere.