Technique for Analysis of Air Samples for13C and18O in Carbon Monoxide via Continuous-Flow Isotope Ratio Mass Spectrometry

1998 ◽  
Vol 70 (24) ◽  
pp. 5159-5161 ◽  
Author(s):  
John E. Mak ◽  
Wenbo Yang
Keyword(s):  
Mass Spectrometry ◽  
Carbon Monoxide ◽  
Continuous Flow ◽  
Isotope Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Air Samples

scholarly journals Continuous-flow isotope ratio mass spectrometry method for carbon and hydrogen isotope measurements on atmospheric methane

2010 ◽  
Vol 3 (3) ◽  
pp. 2433-2476 ◽  
Author(s):  
M. Brass ◽  
T. Röckmann
Keyword(s):  
Mass Spectrometry ◽  
Continuous Flow ◽  
Isotope Ratio ◽  
Mechanical Valve ◽  
Isotope Ratio Mass Spectrometry ◽  
Atmospheric Methane ◽  
Air Samples ◽  
Mixing Ratios ◽  
Analytical System ◽  
Temperature Time

Abstract. We describe a continuous-flow isotope ratio mass spectrometry (CF-IRMS) technique for high-precision δD and δ13C measurements of atmospheric methane on 40 mL air samples. CH4 is separated from other air components by utilizing purely physical processes based on temperature, time and mechanical valve switching. Chemical agents are avoided. Trace amounts of interfering compounds can be separated by gas chromatography after pre-concentration of the CH4 sample. The fully purified sample is then either combusted to CO2 or pyrolyzed to H2 for stable isotope measurement. Apart from connecting samples and refilling liquid nitrogen as coolant the system is fully automated and allows an unobserved, continuous analysis of samples. The analytical system has been used for analysis of air samples with CH4 mixing ratios between ~100 and ~10000 ppb, for higher mixing ratios samples usually have to be diluted.

scholarly journals Continuous-flow isotope ratio mass spectrometry method for carbon and hydrogen isotope measurements on atmospheric methane

2010 ◽  
Vol 3 (6) ◽  
pp. 1707-1721 ◽  
Author(s):  
M. Brass ◽  
T. Röckmann
Keyword(s):  
Mass Spectrometry ◽  
Continuous Flow ◽  
Isotope Ratio ◽  
Mechanical Valve ◽  
Isotope Ratio Mass Spectrometry ◽  
Atmospheric Methane ◽  
Air Samples ◽  
Mixing Ratios ◽  
Analytical System ◽  
Temperature Time

Abstract. We describe a continuous-flow isotope ratio mass spectrometry (CF-IRMS) technique for high-precision δD and δ13C measurements of atmospheric methane on 40 mL air samples. CH4 is separated from other air components by utilizing purely physical processes based on temperature, time and mechanical valve switching. Chemical agents are avoided. Trace amounts of interfering compounds can be separated by gas chromatography after pre-concentration of the CH4 sample. The purified sample is then either combusted to CO2 or pyrolyzed to H2 for stable isotope measurement. Apart from connecting samples and refilling liquid nitrogen as coolant the system is fully automated and allows an unobserved, continuous analysis of samples. The analytical system has been used for analysis of air samples with CH4 mixing ratios between ~100 and ~10 000 ppb, for higher mixing ratios samples usually have to be diluted.

scholarly journals The Use of Stable Isotope Ratio Analysis to Trace European Sea Bass (D. labrax) Originating from Different Farming Systems

Animals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2042
Author(s):  
Francesca Tulli ◽  
José M. Moreno-Rojas ◽  
Concetta Maria Messina ◽  
Angela Trocino ◽  
Gerolamo Xiccato ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Continuous Flow ◽  
Isotope Ratio ◽  
Isotopic Ratio ◽  
Isotope Ratio Mass Spectrometry ◽  
Farming Systems ◽  
Sea Bass ◽  
European Sea Bass ◽  
Δ13c And Δ15n ◽  
Fish Samples

This study aimed to determine whether isotopic ratio mass spectrometry (IRMS) can discriminate farmed European sea bass according to different farming systems and geographic origins. Dicentrarchus labrax of commercial size from three different rearing systems (concrete tank inland, sea cages, and extensive methods in valleys or salt works) were collected at the trading period (autumn–winter). For each farming type, different locations spread over Italy were monitored. Once the fish were harvested, the muscle and feed were sampled. For both muscle and feed, δ13C and δ15N were measured by continuous flow elemental analyzer isotope ratio mass spectrometry (CF-EA-IRMS) with the goal of discriminating samples based on the rearing system. Additional δ2H and δ18O measurements of fish samples were performed by continuous flow total combustion elemental analyzer isotope ratio mass spectrometry (CF-TC/EA-IRMS) to track the geographical origin. The measurements of δ13C and δ15N made it possible to discriminate cultured sea bass from different farming systems (extensive vs. intensive) reared at different geographical sites in Italy. Additional information was obtained from δ18O and δ2H, which enabled the geographical areas of origin of the sea bass farmed extensively and intensively (in cages) to be distinguished.

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