Agilent 990 Micro GC J&W CP-Sil 13 CB Channels

Significance of the Topic

The precise detection of trace odorizing agents such as tert-butyl mercaptan (TBM) in natural gas is essential for leak detection and safety compliance. Micro gas chromatography platforms with specialized column chemistries enable rapid, on-site analysis with minimal sample pretreatment and high selectivity.

Objectives and Overview

This document presents the features and performance of the Agilent 990 Micro GC system equipped with the J&W CP-Sil 13 CB channel. It highlights the system configuration, column properties, and analytical capabilities for detecting TBM at low concentration levels.

Methodology and Instrumentation

The Agilent 990 Micro GC integrates up to four independent analytical channels, each consisting of a MEMS-based inlet, isothermal column, and micro thermal conductivity detector (TCD). Columns are available in various chemistries and configurations, including straight and backflush modes. The CP-Sil 13 CB phase is a medium polarity column optimized for TBM separation from natural gas constituents.
Instrumentation specifics

• Injector: MEMS microheater with 1 to 10 µL injection volume, up to 110 °C
• Column: 12 m length, medium polarity CP-Sil 13 CB, isothermal operation to 180 °C
• Detector: Micromachined dual-channel TCD with 200 nL internal volume and four filaments
• Carrier gases: He, H2, N2, or Ar at 550 ± 10 kPa
• Sample inlet: 1/16 in SST fitting, 5 µm filter, noncondensing gas, 0–110 °C

Main Results and Discussion

The CP-Sil 13 CB channel (Part Number G3588-63739) achieves a detection limit of 0.7 ppm (as TBM) and repeatability below 8 % RSD at 5 ppm. Its medium polarity phase provides high selectivity for TBM in the presence of major natural gas components. The straight configuration ensures straightforward operation without backflush, simplifying method setup.

Benefits and Practical Applications

• High sensitivity and precision for sulfur odorant monitoring
• Compact footprint suitable for field deployment
• Rapid analysis with minimal column maintenance
• Flexible carrier gas options and independent channel control

Future Trends and Potential Applications

Advancements in MEMS technology and column chemistry may further enhance detection limits and reduce analysis time. Integration with wireless data transfer and automated sampling can expand applications in pipeline monitoring, industrial emissions, and environmental surveillance.

Conclusion

The Agilent 990 Micro GC system with the J&W CP-Sil 13 CB channel delivers a robust solution for trace TBM analysis in natural gas. Its combination of selectivity, sensitivity, and micro-scale design supports reliable, on-site quality control and safety monitoring.

References

Agilent Technologies Inc. Data Sheet: Agilent 990 Micro GC J&W CP-Sil 13 CB Channels, July 2024