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Isotopes Environ Health Stud

Title:		Evaluation of the performance of high temperature conversion reactors for compound-specific oxygen stable isotope analysis
Author(s):		Hitzfeld KL; Gehre M; Richnow HH;
Address:		"a Department of Isotope Biogeochemistry , Helmholtz-Centre for Environmental Research - UFZ , Leipzig , Germany"
Journal Title:		Isotopes Environ Health Stud
Year:		2017
Volume:		20160816
Issue:		2
Page Number:		116 - 133
DOI:		10.1080/10256016.2016.1215983
ISSN/ISBN:		1477-2639 (Electronic) 1025-6016 (Linking)
Abstract:		"In this study conversion conditions for oxygen gas chromatography high temperature conversion (HTC) isotope ratio mass spectrometry (IRMS) are characterised using qualitative mass spectrometry (IonTrap). It is shown that physical and chemical properties of a given reactor design impact HTC and thus the ability to accurately measure oxygen isotope ratios. Commercially available and custom-built tube-in-tube reactors were used to elucidate (i) by-product formation (carbon dioxide, water, small organic molecules), (ii) 2nd sources of oxygen (leakage, metal oxides, ceramic material), and (iii) required reactor conditions (conditioning, reduction, stability). The suitability of the available HTC approach for compound-specific isotope analysis of oxygen in volatile organic molecules like methyl tert-butyl ether is assessed. Main problems impeding accurate analysis are non-quantitative HTC and significant carbon dioxide by-product formation. An evaluation strategy combining mass spectrometric analysis of HTC products and IRMS (18)O/(16)O monitoring for future method development is proposed"
Keywords:		Environmental Monitoring/instrumentation/*methods Gas Chromatography-Mass Spectrometry *Hot Temperature Methyl Ethers/analysis Oxygen Isotopes/analysis Carbon monoxide Gc-htc-irms compound-specific isotope analysis high temperature conversion isotope meas;
Notes:		"MedlineHitzfeld, Kristina L Gehre, Matthias Richnow, Hans-Hermann eng England 2016/10/01 Isotopes Environ Health Stud. 2017 May; 53(2):116-133. doi: 10.1080/10256016.2016.1215983. Epub 2016 Aug 16"