Analytical Instrumentation 27
Fast Extended Gas Analysis
New developments in GC technology are providing dramatic improvements to traditional GC analytical methods. The Bruker Gas Chromatograph hardware offers the analyst the ability to fully utilise smaller ID columns to shorten run times. In addition, recently released certification for the Bruker GC allows the safe use of alternative carrier gases such as hydrogen to further improve analysis speed and
resolution while saving costs. Updated valve plumbing configurations reduce the number of flow controls and simplify the overall GC hardware, providing improved throughput and analysis flexibility. Using a narrow bore column with hydrogen carrier and rapid column temperature programming run time can be reduced from over 30 minutes to less than 10 minutes with no loss in resolution or detection.
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Analysis of Unconventional Oil & Bitumen by Simulated Distillation
Crude oil is changing and the focus is now on processing oils that historically were unknown, inaccessible and bound to sand/tar/rock, and so require more energy to process. The refining industry is moving toward upgrading and processing this non-conventional crude feedstock. Innovative developments with the new Bruker 436 GC Simulated Distillation Analyser enable the determination of the true boiling point distribution of these challenging hydrocarbon mixtures. Improved oven performance, inlet design, electronic flow control and the next generation Compass CDS 3.0 data handling software incorporates all of the ASTM, DIN, IP and ISO methods associated with Simulated Distillation analysis.
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Converting GC & GC-MS Methods from Helium to Hydrogen Carrier Gas - More than Just Changing the Cylinder
In recent years, the gap between the supply and demand for helium gas has become increasingly tight. Shortages have forced facilities to ration use or even shut down. Helium has gone up in price by a factor of four from 2000 to 2012, and is expected to increase at a rate of 5 to 20% per year. Under these conditions, laboratories have considered hydrogen as an alternate carrier gas in GC-MS. Hydrogen is a low cost, renewable resource that can be generated on demand, offering the advantages of a high diffusion coefficient, low viscosity and low density with the flattest Van Deemter curve for fast and efficient separations.
However, converting GC and GC-MS methods to hydrogen carrier gas can present challenges in terms of laboratory safety, reactivity/absorption in both the injector and ion source, and decreased sensitivity. Some practitioners have tried connecting a hydrogen line to their GC-MS systems without making any changes to the method, only to find high background, poor chromatography, and severe mass spectral distortions, prompting them to abandon the endeavor. The Bruker SCION TQ with Helium- Free package allows the user to operate safely with hydrogen carrier with minimal loss of sensitivity or spectral distortion. The unique axial ion source design with large turbo pumps are ideal for this low viscosity gas.
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