Просмотр исходного текста страницы Purge and Trap for Autosamplers and Gas Chromatography3942337

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


The Purge and Trap Process
Purge and trap autosamplers are designed for detecting compounds at the smallest parts per billion (ppb) levels, hence their value for detecting dangerous compounds like volatile organic, or aroma compounds that may affect the taste or scent of an product. To arrange a sample for chromatographic analysis, a purge and trap autosampler performs the subsequent process:
Bubbles carry gas over the sample release a the compounds
Sequesters the compounds from the concentrator
Vaporizes the compounds by heating the concentrator
The vaporized compounds pass through the concentrator on the column-a collection of cylindrical tubing housed in the column oven with the chromatograph-then they arrive at the detector, where they are analyzed. Once the analysis is finished, the results are displayed on a data interface, and can be printed using a chart recorder.
Selecting the best [https://streammouse2.shutterfly.com/21 automatic liquid sampler] and trap for Gas Chromatography is a crucial 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 an important concern. When searching for autosamplers who have a purge and trap concentrator, researchers look at the following criteria before you make a purchase:
Mechanical robustness- When laboratories process large volume samples, they require an autosampler whose technology can withstand the trials from the sample injection process.
Analytical ability- When selecting an autosampler for that detection of low-level compounds, the bottom line is to select the one which reduces the potential for carryover between samples as much as possible.
Productivity- In purge and trap autosamplers, high productivity is scheduled by a dual concentrator mode that accommodates liquid and soil samples, and positioning for a large number of liquid and soil samples.
Simplicity of use- A user-friendly interface, intelligent software, and remote control typify an autosampler which is easy to operate.
Ease of maintenance- On-board diagnostic checks, on-board real-time flow diagrams, and an error tracking and sample log make an autosampler low maintenance.
When an autosampler receives high marks in each of the categories, it is considered better than the competition.
Conclusion
Gas Chromatography is in charge of the protection and excellence of various substances, from commercial soda pops to natural pond water. To detect low levels of volatile organic compounds or another compounds over these substances, a gas chromatograph needs an autosampler which includes a purge and trap concentrator. In many instances, researchers pick the autosampler using the criteria above, and sometimes consider acquiring it accustomed to cut costs.