%0 Journal Article
%A Sang, X. F.
%A Gensch, I.
%A Kammer, B.
%A Khan, A.
%A Kleist, E.
%A Laumer, W.
%A Schlag, P.
%A Schmitt, Sebastian
%A Wildt, J.
%A Zhao, R.
%A Mungall, E. L.
%A Abbatt, J. P. D.
%A Kiendler-Scharr, A.
%T Chemical stability of levoglucosan: An isotopic perspective
%J Geophysical research letters
%V 43
%N 10
%@ 0094-8276
%C Hoboken, NJ
%I Wiley
%M FZJ-2016-03201
%P 5419 - 5424
%D 2016
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000378347500091
%R 10.1002/2016GL069179
%U https://juser.fz-juelich.de/record/810538