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 | |
发表期刊 | RAPID COMMUNICATIONS IN MASS SPECTROMETRY |
卷号 | 26期号:22页码:2577-2583 |
文章类型 | 期刊论文 |
摘要 | 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. |
DOI | 10.1002/rcm.6378 |
收录类别 | SCI |
语种 | 英语 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.ieecas.cn/handle/361006/10085 |
专题 | 加速器质谱中心 |
通讯作者 | Liu, WG (Liu, Weiguo)[1,2] |
作者单位 | 1.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 |
推荐引用方式 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. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
rcm.6378.pdf(799KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 请求全文 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论