TO-15 65 Component Mix on Rxi®-1ms (30 m)

Importance of the Topic

Volatile organic compounds are critical environmental and industrial analytes. Reliable detection and quantification of a broad mix of VOCs at low concentrations support regulatory compliance, indoor air quality assessment, and process monitoring.

Objectives and Study Overview

This work evaluates the performance of the Rxi-1ms GC column combined with cryogenic preconcentration for the separation and identification of sixty‐five target VOCs. The aim is to demonstrate rapid, high-resolution analysis suitable for TO-15 applications.

Methodology and Instrumentation

The following configuration was used:

• Column: Rxi-1ms, 30 m × 0.32 mm ID, 1 µm film thickness
• Preconcentrator: Nutech 8900DS cryofocusing at –160 °C
• Trap materials: Glass beads (Trap 1) and Tenax (Trap 2)
• GC Conditions: Oven 35 °C (1 min), ramp to 230 °C at 11 °C/min; helium carrier at 2.0 mL/min
• Injection: Direct, 250 cc sample at 10 ppbv, desorb at 190 °C for 30 s
• MS Detection: HP 5973 quadrupole, EI mode, scan 35–250 amu at 3.32 scans/s

Main Results and Discussion

All sixty-five compounds eluted between 1.37 and 12.38 minutes with baseline separation for the majority of analytes. Early eluters such as propylene and Freon® 12 are resolved within 1.4 minutes, while heavier aromatics and chlorinated species appear after 6 minutes. Two coelutions of minor concern share an ion but are resolved by unique qualifier ions. The fast ramp and optimized film thickness deliver a total run time under 13 minutes without sacrificing peak shape or resolution.

Benefits and Practical Applications

Key advantages include:

• High throughput analysis for regulatory VOC panels
• Robust separation across a wide volatility range
• Enhanced sensitivity from cryogenic preconcentration
• Compatibility with standard TO-15 sampling protocols

Future Trends and Opportunities

Advances may involve integrating two-dimensional GC or high-resolution MS for even greater compound discrimination. Development of automated sampling systems and miniaturized preconcentrators will further streamline field and laboratory workflows.

Conclusion

The Rxi-1ms column coupled with cryofocusing and quadrupole MS provides a rapid, sensitive, and reproducible method for comprehensive VOC analysis. The approach meets TO-15 requirements and supports diverse environmental and industrial applications.

References

• Restek Corporation Application Note 34436: TO-15 65 Component Mix on Rxi-1ms, 30 m column