scholarly journals Chlorine Isotope Effects from Isotope Ratio Mass Spectrometry Suggest Intramolecular C-Cl Bond Competition in Trichloroethene (TCE) Reductive Dehalogenation

Molecules ◽  
2014 ◽  
Vol 19 (5) ◽  
pp. 6450-6473 ◽  
Author(s):  
Stefan Cretnik ◽  
Anat Bernstein ◽  
Orfan Shouakar-Stash ◽  
Frank Löffler ◽  
Martin Elsner
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Isotope Effects ◽  
Isotope Ratio Mass Spectrometry ◽  
Reductive Dehalogenation ◽  
Chlorine Isotope

scholarly journals Measurement of δ18O and δ2H of water and ethanol in wine by Off-Axis Integrated Cavity Output Spectroscopy and Isotope Ratio Mass Spectrometry

2021 ◽  
Author(s):  
Xing Wang ◽  
Henk G. Jansen ◽  
Haico Duin ◽  
Harro A. J. Meijer
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Isotope Analysis ◽  
Isotope Ratio Mass Spectrometry ◽  
Growth Conditions ◽  
The Other ◽  
H Nmr ◽  
Cavity Output ◽  
Pre Treatment ◽  
Output Laser

AbstractThere are two officially approved methods for stable isotope analysis for wine authentication. One describes δ18O measurements of the wine water using Isotope Ratio Mass Spectrometry (IRMS), and the other one uses Deuterium-Nuclear Magnetic Resonance (2H-NMR) to measure the deuterium of the wine ethanol. Recently, off-axis integrated cavity output (laser) spectroscopy (OA-ICOS) has become an easier alternative to quantify wine water isotopes, thanks to the spectral contaminant identifier (SCI). We utilized an OA-ICOS analyser with SCI to measure the δ18O and δ2H of water in 27 wine samples without any pre-treatment. The OA-ICOS results reveal a wealth of information about the growth conditions of the wines, which shows the advantages to extend the official δ18O wine water method by δ2H that is obtained easily from OA-ICOS. We also performed high-temperature pyrolysis and chromium reduction combined with IRMS measurements to illustrate the “whole wine” isotope ratios. The δ18O results of OA-ICOS and IRMS show non-significant differences, but the δ2H results of both methods differ much more. As the δ2H difference between these two methods is mainly caused by ethanol, we investigated the possibility to deduce deuterium of wine ethanol from this difference. The results present large uncertainties and deviate from the obtained 2H-NMR results. The deviation is caused by the other constituents in the wine, and the uncertainty is due to the limited precision of the SCI-based correction, which need to improve to obtain the 2H values of ethanol as alternative for the 2H-NMR method.

Linearity tests for secondary electron multipliers used in isotope ratio mass spectrometry

2001 ◽  
Vol 206 (1-2) ◽  
pp. 105-127 ◽  
Author(s):  
S Richter ◽  
S.A Goldberg ◽  
P.B Mason ◽  
A.J Traina ◽  
J.B Schwieters
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Secondary Electron ◽  
Isotope Ratio Mass Spectrometry
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