Analysis of CO2 with the Jetanizer

Importance of the Topic

The reliable detection of carbon dioxide (CO2) and carbon monoxide (CO) by gas chromatography with flame ionization detection (GC/FID) is essential for environmental monitoring, industrial process control and quality assurance. Traditional methanizers enable this detection by converting these inorganic carbon species into methane but suffer from complex installation, lengthy downtime for replacement and potential throughput loss in busy laboratories.

Objectives and Overview of the Study

This application note evaluates the performance of the ARC Jetanizer™—an integrated, in-jet methanation device—against a conventional commercial methanizer. Key goals include:

• Assessing linearity over six orders of magnitude of CO2 concentration
• Comparing limits of detection (LOD) and quantification (LOQ)
• Evaluating chromatographic peak widths and resolution
• Demonstrating ease of installation and operational robustness

Used Instrumentation

The following instruments and consumables were employed:

• Agilent 7890A GC with split/splitless inlet
• Capillary-optimized FID fitted with Jetanizer™ jet (p/n JT-CAP-P10)
• VICI six-port injection valve for on-column sample introduction
• Commercial ¼″ stainless-steel methanizer cartridge packed with nickel catalyst
• Carrier and makeup gases: helium (99.999%), hydrogen (99.999%), zero-grade air

Methodology and Instrumentation

CO2 masses deposited on column were varied by altering inlet split ratios and mixing pure CO2 or air containing ~500 ppm CO2 with helium using the VICI valve. Actual split was measured by a bubble flow meter for accurate on-column quantification. GC conditions included a 250 °C inlet, 100 °C oven hold, and capillary restrictor column. FID parameters were 450 °C detector temperature, H2 35 sccm, air 350 sccm, and helium makeup 20 sccm.

Main Results and Discussion

A linear response for CO2 spanned six orders of magnitude for both the Jetanizer™ and the commercial methanizer (R² ≈ 1.00). LOD and LOQ were identical (10 pg C and 30 pg C, respectively). Peak full widths at half maximum (FWHM) were comparable across low, medium and high CO2 loads, demonstrating that the Jetanizer™ achieves equivalent chromatographic performance. Moreover, peak resolution was maintained from trace (1 ppm) to bulk (100%) CO2 injections.

Benefits and Practical Applications

The Jetanizer™ offers several practical advantages:

• Rapid installation as a direct FID jet replacement in under five minutes
• Elimination of extensive fittings, insulation and catalyst repacking
• Continuous operation with minimal maintenance downtime
• Broad quantification range suited for environmental, industrial and laboratory QA/QC analyses

Future Trends and Opportunities

Ongoing development may expand the Jetanizer™ to tolerate additional inorganic and volatile organic analytes, integrate with automated sampling workflows and adapt to portable GC-FID platforms. Further refinements in jet geometry and catalyst materials could enhance conversion efficiency and extend device lifetime.

Conclusion

The Jetanizer™ matches the analytical performance of conventional methanizers for CO2 detection by GC/FID over six orders of magnitude while dramatically reducing installation complexity and downtime. Its robustness and ease of use make it a valuable tool for diverse applications in environmental monitoring, process control and laboratory analysis.

Reference

No external literature references were provided in the source document.