Просмотр исходного текста страницы Purge and Trap for Autosamplers and Gas Chromatography9825186

Gas Chromatography (GC) is utilized to research compounds that could be vaporized without decomposing. To investigate these compounds, a gas chromatograph requires an autosampler whose injection mechanism meets the requirements in the analysis. When lower levels of Volatile Organic Compounds (VOCs) or aroma compounds has to be analyzed, a purge and trap autosampler may be the optimal choice.


The Purge and Trap Process
Purge and trap autosamplers are designed for detecting compounds at the deepest parts per billion (ppb) levels, hence their value for detecting dangerous compounds for example volatile organic, or aroma compounds that may modify the taste or scent of a product. To prepare a sample for chromatographic analysis, a purge and trap autosampler performs the following process:
Bubbles carry gas over the sample to discharge the compounds
Sequesters the compounds inside the concentrator
Vaporizes the compounds by heating the concentrator
The vaporized compounds pass from your concentrator towards the column-a collection of cylindrical tubing housed in the column oven of the chromatograph-then they arrive at the detector, where they are analyzed. If the analysis is done, the results are displayed on a data interface, and is printed employing a chart recorder.
Choosing the Right [http://www.blackplanet.com/your_page/blog/view_posting.html?pid=4760915&profile_id=66450313&profile_name=peaground3&user_id=66450313&username=peaground3 automatic liquid sampler] and trap for Gas Chromatography is a vital component to the analysis of low-level compounds. As a result of essential nature from the application, choosing an autosampler with the appropriate capabilities is a concern. When shopping for autosamplers which have a purge and trap concentrator, researchers consider the following criteria before making a purchase order:
Mechanical robustness- When laboratories process large volume samples, they need an autosampler whose technology can withstand the pains of the sample injection process.
Analytical ability- When scouting for an autosampler for your detection of low-level compounds, the hot button is to select the one that reduces the possibility of carryover between samples whenever you can.
Productivity- In purge and trap autosamplers, high productivity is scheduled by a dual concentrator mode that accommodates liquid and soil samples, and positioning for the large numbers of liquid and soil samples.
Easy use- A user-friendly interface, intelligent software, and handheld remote control typify an autosampler that is simple to operate.
Simple maintenance- On-board diagnostic checks, on-board real-time flow diagrams, with an error tracking and sample log make an autosampler easy to maintain.
When an autosampler receives kudos in every of these categories, it is considered better than your competitors.
Conclusion
Gas Chromatography accounts for the safety superiority various substances, from commercial soda pops to natural pond water. To identify low levels of chemical toxins and other compounds in these substances, a gas chromatograph needs an autosampler that includes a purge and trap concentrator. Generally, researchers select the autosampler in line with the criteria above, and quite often consider acquiring it accustomed to spend less.