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Gas Chromatography identifies the process of analysis of compounds using gas chromatograph- a machine that perform the analysis of compounds after being separated from the sample and has been vaporized. A column inlet, also called injector helps to take away the compounds from the sample, vaporizes and injects them into the column of the chromatograph.

The purge and gas chromatography is normally performed to analyze the compounds that are occurring at the reduced parts per billion levels. It also involves a purge and trap column inlet.

Purging and Trapping

After the sample has been transported to the column inlet, either through autosampler or manually, it will undergo the following procedure for purging and trapping before being injected in to the columns of chromatograph:

The inter gas is bubbled via the sample and releases the compounds
The released compounds are trapped on an absorbent material within the concentrator
The concentrator is heater till the compound is vaporized
After the compound gets vaporized, they’re transported back again to the column on a steam of gases. This process is called because the Mobile Phase of GC. This action concludes the purge and the trap process and starts the chromatography process occurring in the following manner:

The compounds firstly enter the column
They are passed by way of a liquid called stationary phase. The compounds then exit the column and enter analyzer
They’re detected and identified
In the labs such processes are initiated via autosampler that shifts the sample to column inlet.

Common Applications

The most frequent and usual application for purge and trap gas chromatography is analyzing the VOCs- Volatile Organic Compounds. They are the naturally occurring elements that cause adverse health effects and environmental damage. They’re toxic to humans and animal even though consumed in smaller amounts.

They will have a tendency to vaporize at room temperature that helps them pervade the environment. VOC analysis may be the best known application for GC but its not the only one. They are also used to assess the effects of certain compounds on taste and smell of varied foods, beverages and cosmetic products together with fragrances.

Conclusion

Purge and trap gas chromatography is useful for low level compounds in liquid and soil samples that threatened safety to environment and products. The purpose of Gas Chromatography is to analyze those compounds that are present at a low PPB level. The accuracy of the process depends on using right type of inlets, columns and the ones who perform the purge and trap function.

headspace sampler and trap gas chromatography can be used to judge low level compounds. Purge and trap equipment can be bought online or offline form suppliers at cheap prices. You’re advised to choose quality products to retain preciseness of results and process. Because the functions derive from small elements, it is very important to keep the accuracy sharp right form start.