Abstract
The dual isotope ratio analysis, carbon (δ13 C value) and hydrogen (δ2 H value), of methane (CH4 ) is a valuable tracer tool within a range of areas of scientific investigation, not least wetland ecology, microbiology, CH4 source identification and the tracing of geological leakages of thermogenic CH4 in groundwater. Traditional methods of collecting, purification, separating and analysing CH4 for δ13 C and δ2 H determination are, however, very time consuming, involving offline manual extractions. Here we describe a new gas chromatography, pyrolysis/combustion, isotope ratio mass spectrometry (IRMS) system for the automated analysis of either dissolved or gaseous CH4 down to ambient atmospheric concentrations (2.0 ppm). Sample introduction is via a traditional XYZ autosampler, allowing either helium (He) purging of gas or sparging of water from a range of suitable, airtight bottles. The system routinely achieves precision of <0.3‰ for δ13 C values and <3.0‰ for δ2 H values, based on long-term replicate analysis of an in-house CH4 /He mix standard (BGS-1), corrected to two externally calibrated reference gases at near atmospheric concentrations of methane. Depending upon CH4 concentration and therefore bottle size, the system runs between 21 (140-mL bottle) and 200 samples (12-mL exetainer) in an unattended run overnight. This represents the first commercially available IRMS system for dual δ13 C and δ2 H analysis of methane at atmospheric concentrations and a step forward for the routine (and high-volume) analysis of CH4 in environmental studies.
Highlights
Atmospheric methane (CH4) is the second most abundant and potent greenhouse gas after carbon dioxide (CO2).[1]
Changes in the flux associated with anthropogenic sources represent the major factor responsible for the significant post-industrial CH4
Sercon (Crewe, UK) have produced a CryoGas preparation module coupled to a 20-22 isotope ratio mass spectrometer (CG-2022), which is the first commercially available automated system that combines gas chromatography, cryogenic trapping, pyrolysis/combustion, and continuous flow isotope ratio mass spectrometry (IRMS) for the high-precision, high-throughput measurement of the δ13C and δ2H values of CH4 down to atmospheric concentrations
Summary
Atmospheric methane (CH4) is the second most abundant and potent greenhouse gas after carbon dioxide (CO2).[1]. Sercon (Crewe, UK) have produced a CryoGas preparation module coupled to a 20-22 isotope ratio mass spectrometer (CG-2022), which is the first commercially available automated system that combines gas chromatography, cryogenic trapping, pyrolysis/combustion, and continuous flow IRMS for the high-precision, high-throughput measurement of the δ13C and δ2H values of CH4 down to atmospheric concentrations.
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