Measuring oxygen yields of a thermal conversion/elemental analyzer-isotope ratio mass spectrometer for organic and inorganic materials through injection of CO

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	Measuring oxygen yields of a thermal conversion/elemental analyzer-isotope ratio mass spectrometer for organic and inorganic materials through injection of CO
	Yin, Xijie ; Chen, Zhigang ; Chen ZG(陈志刚)
刊名	http://dx.doi.org/10.1002/jms.3463
	2014
关键词	Benzoic acid Calcium carbonate Carbon monoxide Isotopes Mass spectrometers Pyrolysis Silicon oxides Thermal conductivity
英文摘要	The thermal conversion/elemental analyzer-isotope ratio mass spectrometer (TC/EA-IRMS) is widely used to measure the δ18O value of various substances. A premise for accurate δ18O measurement is that the oxygen in the sample can be converted into carbon monoxide (CO) quantitatively or at least proportionally. Therefore, a precise method to determine the oxygen yield of TC/EA-IRMS measurements is needed. Most studies have used the CO peak area obtained from a known amount of a solid reference material (for example, benzoic acid) to calibrate the oxygen yield of the sample. Although it was assumed that the oxygen yield of the solid reference material is 100%, no direct evidence has been provided. As CO is the analyte gas for δ18O measurement by IRMS, in this study, we use a six-port valve to inject CO gas into the TC/EA. The CO is carried to the IRMS by the He carrier gas and the CO peak area is measured by the IRMS. The CO peak area thus obtained from a known amount of the injected CO is used to calibrate the oxygen yield of the sample. The oxygen yields of commonly used organic and inorganic reference materials such as benzoic acid (C6H5COOH), silver phosphate (Ag3PO4), calcium carbonate (CaCO3) and silicon dioxide (SiO2) are investigated at different reactor temperatures and sample sizes. We obtained excellent linear correlation between the peak area for the injected CO and its oxygen atom amount. C6H5COOH has the highest oxygen yield, followed by Ag3PO4, CaCO3 and SiO2. The oxygen yields of TC/EA-IRMS are less than 100% for both organic and inorganic substances, but the yields are relatively stable at the specified reactor temperature and for a given quantity of sample.
语种	英语
出版者	John Wiley and Sons Ltd
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/88284]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Yin, Xijie,Chen, Zhigang,Chen ZG. Measuring oxygen yields of a thermal conversion/elemental analyzer-isotope ratio mass spectrometer for organic and inorganic materials through injection of CO[J]. http://dx.doi.org/10.1002/jms.3463,2014.
APA	Yin, Xijie,Chen, Zhigang,&陈志刚.(2014).Measuring oxygen yields of a thermal conversion/elemental analyzer-isotope ratio mass spectrometer for organic and inorganic materials through injection of CO.http://dx.doi.org/10.1002/jms.3463.
MLA	Yin, Xijie,et al."Measuring oxygen yields of a thermal conversion/elemental analyzer-isotope ratio mass spectrometer for organic and inorganic materials through injection of CO".http://dx.doi.org/10.1002/jms.3463 (2014).