Gas Chromatography refers to the process of analysis of compounds using gas chromatograph- a machine that perform the analysis of compounds after being separated from the sample and contains been vaporized. A column inlet, also known as injector helps to remove the compounds from the sample, vaporizes and injects them into the column of the chromatograph.

The purge and gas chromatography is usually performed to investigate the compounds which are occurring at the low 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’ll 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
Once the compound gets vaporized, they’re transported back again to the column on a steam of gases. This process is called as the Mobile Phase of GC. This action concludes the purge and the trap process and starts the chromatography process occurring in the next manner:

The compounds firstly enter the column
Then they are passed through a liquid called stationary phase. headspace sampler exit the column and enter analyzer
They are detected and identified
In the labs such processes are initiated via autosampler that shifts the sample to column inlet.

Common Applications

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

They will have a tendency to vaporize at room temperature that helps them pervade the surroundings. VOC analysis might 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 various foods, beverages and cosmetic products together with fragrances.

Conclusion

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

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