A new method for the analysis of trace methanol in crude oil samples was developed based on two-dimensional heart-cutting gas chromatography. The method was tested on an Agilent 6890N GC system equipped with a new gas phase microfluidic Deans switch that improved the performance of heart-cutting two-dimensional gas chromatography. The results obtained with this method exceeded the performance requirements of ASTM D7059 for the analysis of methanol in crude oil.
The document details a new gas phase micro-fluidic Deans switch developed for the Agilent 6890N GC system to improve the performance of heart-cutting two-dimensional gas chromatography. This integrated device replaces traditional plumbing assemblies to reduce thermal mass, minimize leaks, and prevent solvent adsorption, thereby enhancing sensitivity for trace analysis.
| Secondary Column | CP-Lowox column, 10 m x 0.53-mm id |
|---|---|
| Injection Port Temperature | 325 °C |
| Oven Final Temperature | 300 °C |
| Calibration Range | 5 to 1000 ppm (m/m) |
The method requires a signal-to-noise ratio of 5:1 for a 2-ppm standard.
It is recommended to change the liner after 50 injections.
The inlet body may need to be cleaned after 100 injections depending on the samples.