This application note demonstrates the capabilities of the Agilent J&W CP-COX column with the Agilent 490 Micro GC, including separation of permanent gases and backflush possibilities to ensure extended column lifetimes.
This document describes an application using the Agilent J&W CP-COX column with an Agilent 490 Micro GC system to analyze permanent gases. It highlights that while traditional Molsieve columns require high-temperature bakeouts to regenerate, the CP-COX column allows carbon dioxide to elute and offers a prolonged lifetime. The note details how a precolumn with backflush can remove water and higher hydrocarbons to prevent column pollution.
The document presents experimental results showing the repeatability of the analysis for components including helium, hydrogen, oxygen, nitrogen, carbon monoxide, methane, and carbon dioxide. It concludes that the CP-COX column is a good alternative to Molsieve for permanent gas analysis, ensuring reliable results with good repeatability figures.
| Column Temperature | 100 °C |
|---|---|
| Backflush to Vent Time | 13s |
| Injection Time | 80 ms |
| Injection Temperature | 110 °C |
| Sample Line Temperature | 100 °C |
| Sampling Time | 30s |
| Stabilization Time | 5s |
| Run Time | 200s |
The repeatability figures per component on peak area are: He (0.43%), H2 (0.47%), N2+O2 (0.47%), CO (0.64%), CH4 (0.33%), and CO2 (0.51%).
No, the CP-COX column does not separate oxygen and nitrogen; they elute as a single peak.
Water and higher hydrocarbons are backflushed to the vent to prevent them from entering the analytical column and polluting it.