The type of autosampler one uses can have a significant impact on the results of chromatographic analysis. When Gas Chromatography (GC) is used to test for low level compounds in a solid or liquid calorimeter indonesia, an autosampler that features purge and trap technology is used, as it excels at reading compounds occurring at low parts per billion (ppb) levels.
Almost every laboratory that analyzes the compounds in solids or liquids uses an autosampler, and often more than one. If you have questions regarding the use, purchase, or capabilities of a purge and trap autosampler for GC, the answers below can be informative:
How does the autosampler work?
A purge and trap autosampler puts a sample through a three-step process before injecting it into the column of the gas chromatograph:
(1) bubbling carrier gas through the sample,
(2) trapping the released compounds in the concentrator,
(3) heating the concentrator until the compounds vaporize.
Following proximate analyzer indonesia this process, the vaporized compounds travel through the column to the detector, where they are analyzed. The results of the analysis can be transferred to a computer and/or printed using a chart recorder.
What is the autosampler used to measure?
A purge and trap concentrator is used to help measure low level compounds, particularly Volatile Organic Compounds (VOCs) that create safety or environmental hazards. Aroma compounds are also analyzed with the help of purge and trap autosamplers.
How can carryover between samples be eliminated?
Reducing carryover between samples is crucial for attaining the right analysis. Purge and trap equipment that uses a fast hot water rinse in a fixed volume loop to keep the water in the pathway hot, and flushes the soil needle and transfer line offers excellent protection against sample carryover.
Can the autosampler come equipped with network security measures?
Some autosamplers come equipped with an air gapping function that physically, electronically, and electromagnetically separates the network from non-secure networks, completely eliminating the chance of unapproved network access. Other network security measures such as firewalls may also be used, but air gapping offers the highest form of security.
Can certain design characteristics reduce the cost of operation?
Yes. The best way to reduce the cost of operating a purge and trap autosampler is to purchase one that uses standard syringes instead of proprietary syringes, and operates electronically instead of using carrier gas.
Is it profitable to purchase the equipment used?
Analytical equipment is frequently purchased used. As long as a used autosampler has been well maintained, does not have a high level of wear, and is sold by a reputable seller, it can offer the buyer a much needed price break while still delivering quality performance.
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