Agilent 990 Micro GC J&W CP-COX Channels

Significance of the Topic

The accurate separation and quantification of CO and CO₂ in gas mixtures are fundamental for environmental compliance, industrial quality control, and research applications. The micro GC approach reduces analysis time and sample size, enhancing throughput and operational efficiency.

Objectives and Study Overview

This data sheet presents the design features, channel configurations, and performance specifications of the Agilent 990 Micro GC equipped with J&W CP-COX channels, focusing on its capabilities for CO and CO₂ separation.

• Overview of available CP-COX column chemistries and configurations
• Key performance metrics: resolution, detection limits, repeatability
• Advantages of backflush options for faster analysis and column maintenance

Methodology

The system employs a MEMS-based injector, isothermal micro-packed columns, and micromachined thermal conductivity detectors across up to four independent analytical channels. CP-COX columns use carbon-based stationary phases to resolve CO, CO₂, and trace water. Backflush and backflush-to-detector configurations enable removal of heavy components and composite peak formation for C₆+ species.

Instrumentation

• Agilent 990 Micro GC platform with independent channel control
• J&W CP-COX columns (1 m length, straight or 1 m precolumn backflush)
• Micromachined thermal conductivity detector (dual-channel, four filaments, 200 nL volume)
• Micromachined injector with heated transfer line (up to 110 °C) and 1.6 mm stainless steel inlet
• Carrier gases: He, H₂, N₂, or Ar at 550 kPa ±10 kPa

Main Results and Discussion

Straight CP-COX columns deliver a resolution of 1.5 for N₂/CO (1% each), while backflush variants improve resolution to 1.2. CO₂ detection limits reach 10 ppm with peak area repeatability of 1% RSD. Water elution stabilizes retention times, and coelution of N₂ and O₂ produces a quantifiable composite peak. Backflush modes minimize column fouling and shorten analysis cycles.

Benefits and Practical Applications

• High-throughput analysis with minimal maintenance requirements
• Stable isothermal operation up to 180 °C
• Flexible carrier gas selection adapts to application needs
• Backflush options extend column life and improve cycle times
• Ideal for field deployments, environmental monitoring, process control, and research laboratories

Future Trends and Opportunities

Advancements in micro GC instrumentation are moving toward fully integrated, portable systems with expanded multi-analyte detection, enhanced data analytics, and new stationary phase chemistries. Innovations may further improve sensitivity for trace-level gases and support real-time monitoring in industrial and environmental contexts.

Conclusion

The Agilent 990 Micro GC with J&W CP-COX channels offers a robust, high-performance solution for CO and CO₂ analysis. Its modular design, precise thermal control, and backflush capabilities ensure rapid, reproducible results across diverse applications.

Reference

Agilent Technologies. Agilent 990 Micro GC J&W CP-COX Channels Data Sheet, July 2024.