A method using gas chromatography-thermal conductivity detection (GC/TCD) with an HP-PLOT Q capillary column for the analysis of a natural gas sample is described. Over 70 sequential runs showed good separation for a wide variety of analytes with good method reproducibility.
The document presents a one-dimensional gas chromatography (GC) method using a Thermal Conductivity Detector (TCD) to analyze natural gas samples. It highlights the use of a new HP porous polymer, Q-type PLOT column (part number 19095P-QO4) which overcomes limitations found in other commercial columns regarding the separation of polar compounds and fixed gases from hydrocarbons.
The note details experimental conditions for an Agilent 6890 series GC with electronic pneumatics control. It compares the resolution of nitrogen, carbon dioxide, and methane using the HP-PLOT Q column against two other brands (X and Y). Results indicate that the HP-PLOT Q column provides superior resolution and excellent reproducibility over 70 sequential runs.
| Column Dimensions | 0.53 mm x 30 m |
|---|---|
| Carrier Gas | Helium, 8.6 ml/min @ 60°C |
| Oven Program | 60°C (2 min) to 240°C at 30°C/min |
| Injection Mode | Split mode, 250°C |
| Sampling Loop Size | 0.25 cc |
| Split Ratio | 18:1 |
The upper isothermal and programming temperature limits are 270°C and 290°C, respectively.
Over 70 sequential runs were performed over three days to evaluate method reproducibility.