Using a Purge and Trap Autosampler: Frequently Asked Questions

In elemental analysis equipment, the definition of purge and trap determines a type of autosampler inlet that uses a mechanism to introduce the sample. Often used for gas chromatography, inlets that feature purge and snare technology have the potential to discover compounds at low parts per million (ppb) levels. Thus, they are the preferred type of inlet for tests for volatile organic and natural chemical substances (VOCs), dangerous gases that typically vaporize at room temperature. headspace sampler

A purge and trap autosampler is an improvement after autosamplers that require the sample to be injected by hands. Moreover to preserving the integrity of the test, purge and trap components also help to protect the tester and improve the gas chromatography process. If you are considering investing in an autosampler, however, you need to have some questions answered before you do, the answers below could help: 

Besides VOCs, what else are purge and trap autosamplers used to assess?

In addition to VOCs, they are generally used to study soil and water in the pursuing capacities, among others:

Inspecting the types of chemical substance pollution at brownfield sites
Analyzing pollutants in waste materials water
Checking for impurities in surface water and drinking water
Testing harvest soil for vitality
Examining the soil in low emissions zones (LEZ) for certain types of particles
Autosamplers are being used for commercial purposes and far as they are being used for environmental purposes. They can be used for food and refreshment analysis.

What testing process does a purge and trap autosampler expose an example to?

They put the sample through a five-part process before providing it to the line of the gas chromatograph:

Bubble carrier gas through the sample
Purge the compounds that are being tested for
Hold the compounds in the concentrator
Vaporize the compounds by heating the trap
Following these steps are complete, the vapor that includes the compounds moves with the carrier gas to the detector, where it is analyzed. When the analysis is complete, the results display on the chromatograph’s interface.

Are certain clear away and trap autosamplers better than others?

Much like any type of equipment, certain autosamplers receive higher evaluations than others. Currently, one autosampler that is preferred by scientists around the world is the Century WS Autosampler, which will get excellent ratings in the following categories: analytical brilliance, mechanical robustness, productivity, easiness of use, and convenience of maintenance.

Can clear away and trap autosamplers be used in tandem with other autosamplers?

Yes. They will are often used in tandem with autosamplers that are designed to evaluate compounds that occur at high ppb levels, such as static headspace and dynamic headspace autosamplers.

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