TY  - JOUR
AU  - Sang, X. F.
AU  - Gensch, I.
AU  - Kammer, B.
AU  - Khan, A.
AU  - Kleist, E.
AU  - Laumer, W.
AU  - Schlag, P.
AU  - Schmitt, Sebastian
AU  - Wildt, J.
AU  - Zhao, R.
AU  - Mungall, E. L.
AU  - Abbatt, J. P. D.
AU  - Kiendler-Scharr, A.
TI  - Chemical stability of levoglucosan: An isotopic perspective
JO  - Geophysical research letters
VL  - 43
IS  - 10
SN  - 0094-8276
CY  - Hoboken, NJ
PB  - Wiley
M1  - FZJ-2016-03201
SP  - 5419 - 5424
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000378347500091
DO  - DOI:10.1002/2016GL069179
UR  - https://juser.fz-juelich.de/record/810538
ER  -