DIOXIN: Magnetic Sector GC-HRMS with DualData XL Option: helium savings and flow optimization for maximized productivity and cost savings for PBDE, dioxin and PCB analysis

Significance of the Topic

The analysis of persistent organic pollutants such as dioxins, PCBs and PBDEs by high-resolution GC-MS is critical for environmental monitoring and regulatory compliance. Helium shortages and rising operational costs drive the need for methods that maximize sample throughput while minimizing carrier gas consumption.

Objectives and Overview of the Study

This work evaluates the performance of the Thermo Scientific DFS Magnetic Sector GC-HRMS equipped with the DualData XL Option, coupled to two TRACE 1310 GCs and an Instant Connect Helium Saver Injector Module. The goal is to eliminate GC ‘‘dead time,’’ double analytical throughput and achieve substantial helium savings without compromising sensitivity or chromatographic integrity.

Methodology

The system employs two parallel GCs running staggered injections under software-controlled timing. A proprietary microfluidic channel device (MCD) dynamically switches each GC’s effluent between waste and the MS source, directing only target retention windows into the spectrometer. While one GC injects and elutes blank or solvent, the other delivers analytes to the MS. Carrier gas makeup and valve timing maintain constant ion source pressure. Analyses were conducted in multiple ion detection mode at 10,000 resolution, using EPA 1613, 1668 and 1614 standards to assess performance.

Instrumentation Used

• Thermo Scientific TRACE 1310 GC with DualData XL Option
• DFS Magnetic Sector GC-HRMS (resolution 10,000; MID mode)
• Thermo Scientific TriPlus RSH Autosampler with extended x-rail
• Instant Connect Helium Saver Injector Module (split/splitless inlet)
• Columns: Thermo TR-Dioxin 60 m × 0.25 mm ID × 0.1 µm film; additional 15 m column for PBDEs

Main Results and Discussion

Chromatograms acquired with and without the MCD device showed virtually identical peak shapes and sensitivities. EPA 1613 criteria for peak separation (valley > 25%) were easily met for 2,3,7,8-TCDD and congeners. The DualData XL sequence eliminated up to 30 minutes of dead time per run, effectively nearly doubling sample throughput (> 90% increase). Helium consumption was reduced significantly by combining the dynamic flow switching with the Helium Saver Injector, while ion source pressure remained stable.

Benefits and Practical Applications

Key advantages include:

• Up to two-fold increase in sample throughput on a single HRMS
• No loss in sensitivity or chromatographic performance
• Major reduction in helium usage and associated costs
• Flexibility to run mixed applications (dioxins, PCBs, PBDEs) on one system
• Compliance with EPA and CEN regulatory methods

Future Trends and Potential Applications

Emerging directions include broader integration of dual-column workflows for other pollutant classes, enhanced real-time control of carrier gas consumption, and further miniaturization of flow switching devices. Adoption of similar dual-GC strategies may extend to routine QA/QC laboratories and industrial analytics seeking sustainable, high-throughput solutions.

Conclusion

The DualData XL Option on the DFS Magnetic Sector GC-HRMS, combined with the Instant Connect Helium Saver Injector, doubles analytical productivity and delivers substantial helium savings without sacrificing performance. This configuration is validated for routine, high-throughput analysis of dioxins, PCBs and PBDEs under regulatory frameworks.

References

1. U.S. Environmental Protection Agency, Method EPA 1613 Rev. B, Washington, October 1994.
2. European Committee for Standardization, EN 1948, Brussels, December 1996.
3. Thermo Fisher Scientific, Application Note AN30098, Bremen, 2006.