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An evaluation of alumina reaction tube conditioning for high-precision H-2/H-1 isotope measurements via gas chromatography/thermal conversion/isotope ratio mass spectrometry
Cao, YN (Cao, Yunning)[1]; Liu, WG (Liu, Weiguo)[1,2]; Sauer, PE (Sauer, Peter E.)[3]; Wang, Z (Wang, Zheng)[1]; Li, ZH (Li, Zheng-hua)[4]
2012-11-30
Source PublicationRAPID COMMUNICATIONS IN MASS SPECTROMETRY
Volume26Issue:22Pages:2577-2583
Subtype期刊论文
Abstract

RATIONALE The condition of the pyrolysis reactor is very important for obtaining stable, precise hydrogen isotopic ratios using gas chromatography/thermal conversion/isotope ratio mass spectrometry (GC/TC/IRMS). However, few studies of the conditioning process have been conducted, and little is known about the best methods for high-precision hydrogen isotope analysis. METHODS We investigated delta H-2 variations and observed the changes in carbon coating using six different conditioning methods for the pyrolysis alumina tube: (i) no treatment; (ii) conditioning with 4 mu L hexane; (iii) conditioning with 2 mu L hexane; (iv) conditioning with 2 mu L hexane followed by backflushing overnight; (v) conditioning with 10 s of backflushing with methane; (vi) conditioning with 3 s of backflushing with methane. RESULTS Conditioning the alumina tube can improve the pyrolysis efficiency of organic compounds because a moderate amount of carbon acts as a catalyst in high-temperature regions of the alumina tube. Carbon actually flows in the tube and is difficult to confine to the high-temperature region. Insufficient amounts of carbon in the high-temperature regions lead to incomplete pyrolysis of organic compounds and lower delta H-2 values due to kinetic fractionation of hydrogen isotopes. In contrast, excess hexane or methane can lead to higher delta H-2 values, probably due to enrichment of deuterium in the hydrocarbon residue. CONCLUSIONS The delta H-2 values obtained by Method 6 are closest to the TC/EA delta H-2 values and are more precise than those obtained by other methods, perhaps because this method introduces a moderate, consistent amount of carbon with each sample injection.

DOI10.1002/rcm.6378
Indexed BySCI
Language英语
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10085
Collection加速器质谱中心
Corresponding AuthorLiu, WG (Liu, Weiguo)[1,2]
Affiliation1.State Key Lab of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, China;
2.School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
3.Department of Geological Sciences, Indiana University, Bloomington, IN 47405-1405, USA;
4.Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, USA
Recommended Citation
GB/T 7714
Cao, YN ,Liu, WG ,Sauer, PE ,et al. An evaluation of alumina reaction tube conditioning for high-precision H-2/H-1 isotope measurements via gas chromatography/thermal conversion/isotope ratio mass spectrometry[J]. RAPID COMMUNICATIONS IN MASS SPECTROMETRY,2012,26(22):2577-2583.
APA Cao, YN ,Liu, WG ,Sauer, PE ,Wang, Z ,&Li, ZH .(2012).An evaluation of alumina reaction tube conditioning for high-precision H-2/H-1 isotope measurements via gas chromatography/thermal conversion/isotope ratio mass spectrometry.RAPID COMMUNICATIONS IN MASS SPECTROMETRY,26(22),2577-2583.
MLA Cao, YN ,et al."An evaluation of alumina reaction tube conditioning for high-precision H-2/H-1 isotope measurements via gas chromatography/thermal conversion/isotope ratio mass spectrometry".RAPID COMMUNICATIONS IN MASS SPECTROMETRY 26.22(2012):2577-2583.
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