Presentation Profile
Application of GC×GC-VUV and GC×GC-FID for the analysis of common gasoline samples, middle distillates and crude oil distillation cuts
Currently Scheduled: 10/15/2019 - 3:15 PM - 3:35 PM
Room: South Lobby
Main Author
Ramkumar Dhandapani - Phenomenex
- Dr. Max Jennerwein - ASG Analytik-Service
- Dr. Thomas Wilharm - ASG Analytik-Service
- Dr. Markus Eschner - ASG Analytik-Service
- Timothy Nelson - Phenomenex
Abstract:
Comprehensive two-dimensional gas chromatography has made its way to lab routine for several years now. One of the most frequent utilizations of this instrumentation is the analysis of middle distillates like diesel fuel, heating oil or jet fuel. In most cases GC×GC technique is achieved by thermal modulation and FID or mass spectrometry for detection. An alternative is provided by flow modulation, a reliable modulation for a broad temperature range without consumption of LN2. This makes it an optimal instrument for the analysis of gasoline samples. The analysis of gasoline is usually accomplished following the European standard DIN EN ISO 22854, ASTM D6839, respectively. Up to now, there is only one manufacturer supplying an analytical instrument that complies with these standards. Moreover, high concentration of e.g. methanol, which is coming up in some countries, is not covered by these standards and there are no precision statements therefore. Deviations from the common composition of gasoline can be problematic or even harmful to the applied instrument (e.g. high amounts of MeOH, EtOH, H2O or high boilers). Therefore a more detailed insight in the composition is not possible. Now, a promising new technique can be reported, which is described by ASTM D8071. This analytical method applies GC-Vacuum Ultraviolet detection (GC-VUV) for the quantitative determination of the content of n-paraffins, iso-paraffins, olefins, naphthenes, aromatics and oxygenates in common gasoline. In addition, it is possible to detect and identify di-olefins with unconjugated and conjugated double bonds. In the presented work, the application of GC×GC –VUV and a possible transition to GC×GC –FID were tested. The hyphenation of both techniques results in a powerful new analytical method. Although, at the current state of the software, it is not possible to exploit the full potential, it is obvious what these techniques provide for the future. For the analysis of gasoline, this technique will overcome the weakness of both instruments. Low concentrated analytes like di-olefins can clearly be identified using VUV detection and the increased sensitivity can be achieved from the two-dimensional GC separation.
