Gas Chromatography identifies the procedure 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. headspace sampler , also known as injector helps to remove the compounds from the sample, vaporizes and injects them in to the column of the chromatograph.
The purge and gas chromatography is usually performed to investigate the compounds that are occurring at the low parts per billion levels. It also involves a purge and trap column inlet.
Purging and Trapping
Once the sample has been transported to the column inlet, either through autosampler or manually, it’ll undergo the following process of 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 are 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 that occurs in the following manner:
The compounds firstly enter the column
Then they are passed through a liquid called stationary phase. The compounds then 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 frequent 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 are toxic to humans and animal even though consumed in smaller amounts.
They have a tendency to vaporize at room temperature that helps them pervade the environment. VOC analysis might be the best known application for GC but its not the only one. They are also being used to assess the effects of certain compounds on taste and smell of various foods, beverages and cosmetic products and also fragrances.
Conclusion
Purge and trap gas chromatography is useful for low level compounds in liquid and soil samples that threatened safety to natural environment and products. The purpose of Gas Chromatography is to analyze those compounds which are present at a minimal 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.
Purge and trap gas chromatography is used to judge low level compounds. Purge and trap equipment can be bought online or offline form suppliers at cheap prices. You are advised to go for quality products to retain preciseness of results and process. Because the functions are based on small elements, it is very important to help keep the accuracy sharp right form start.