Letter pubs.acs.org/ac
Accurate Method for the Determination of Intramolecular Isotope Composition of Ethanol from Aqueous Solutions
13
C
Alexis Gilbert,*,† Keita Yamada,† and Naohiro Yoshida†,‡ †
Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8503, Japan ‡ Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan S Supporting Information *
ABSTRACT: A new method, combining headspace solid phase microextraction (HS-SPME) with an online pyrolysis system coupled with isotope ratio mass spectrometry (IRMS), is developed for the determination of the intramolecular 13C isotope composition of ethanol in aqueous solutions. The δ13C values of the pyrolytic fragments (CO, CH4, C2H4) are shown to be highly reproducible (sd
