scholarly journals Precision and long-term stability of clumped-isotope analysis of CO2 using a small-sector isotope ratio mass spectrometer

2012 ◽  
Vol 27 (1) ◽  
pp. 207-215 ◽  
Author(s):  
Naohiro Yoshida ◽  
Mikhail Vasilev ◽  
Prosenjit Ghosh ◽  
Osamu Abe ◽  
Keita Yamada ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Isotope Ratio ◽  
Isotope Analysis ◽  
Term Stability ◽  
Long Term Stability ◽  
Isotope Ratio Mass Spectrometer ◽  
Clumped Isotope

scholarly journals A STUDY ON CARBON ISOTOPE OF CO2 AND CH4 IN WESTERN DIENG PLATEU BY GAS CHROMATOGRAPHY- ISOTOPE RATIO MASS SPECTROMETER (GC-IRMS)

2010 ◽  
Vol 5 (1) ◽  
pp. 11-14
Author(s):  
Hanik Humaida
Keyword(s):  
Gas Chromatography ◽  
Carbon Isotope ◽  
Mass Spectrometer ◽  
Isotope Ratio ◽  
Isotope Analysis ◽  
Ionization Detector ◽  
Volcanic Gas ◽  
Porapak Q ◽  
Flame Ionization ◽  
Isotope Ratio Mass Spectrometer

The carbon isotope can be used to evaluate volcanism phenomenon of volcano. The study of carbon isotope of CO2 and CH4 was carried out in western Dieng Plateau by mass-spectrometer. Before analysis, sampel was separated by gas chromatography using a Porapak-Q column and a FID (Flame Ionization Detector) detector. The gas was oxidized by copper oxide at 850oC before being ionized in mass-spectrometer for isotope analysis. The CO2 content in Candradimuka crater (-4.10 O/OO), indicated that the gas may be as volcanic gas. The other CO2 from Sumber and western Gua Jimat, had isotope value  of -10.05 and -12.07 O/OO, respectively, indicating contamination from crustal and subduction material. The carbon isotope of CH4 gas from Pancasan village was -63.42 O/OO, that may be categorized as biogenic gas.   Keywords: isotope, CO2, CH4, Dieng.

scholarly journals Use of nitrous oxide as a purge gas for automated nitrogen isotope analysis by the Rittenberg technique

1997 ◽  
Vol 19 (5) ◽  
pp. 165-168 ◽  
Author(s):  
R. L. Mulvaney ◽  
S. A. Khan ◽  
G. K. Sims ◽  
W. B. Stevens
Keyword(s):  
Nitrous Oxide ◽  
Mass Spectrometer ◽  
Isotope Ratio ◽  
Isotope Analysis ◽  
Nitrogen Isotope ◽  
Inlet System ◽  
Ammonium N ◽  
Relative Standard ◽  
Isotope Ratio Mass Spectrometer ◽  
Purge Gas

An apparatus that operates with an isotope-ratio mass spectrometer to automatically perform nitrogen isotope analyses by the Rittenberg technique was modified to permit the use of nitrous oxide (N2O) instead of Freon (CCl2F2or CHClF2) for the purging of air prior to hypobromite oxidation of ammonium-N to N2in a plastic microplate. Analytical performance was unaffected by the modifications. Up to 768 samples can be processed in a single loading, at a rate of 6 to 12 samples/h. Within the range of 0.2 to 20 atom %15N, isotope-ratio analyses of 50 to 200 μg of N using the automated Rittenberg apparatus (ARA) with a double-collector mass spectrometer were accurate to within 0.7%, as compared to manual Rittenberg analyses of 1 mg of N using the same mass spectrometer with a dual-inlet system. Automated analyses of 20μg of N were accurate to within 2%, and automated analyses of 10 μg of N were accurate to within 7%. The relative standard deviation for measurements at the natural abundance level (10 analyses, 20-200 μg of N) was < 0.04 %.

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