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 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 usually performed to analyze the compounds which are occurring at the reduced parts per billion levels. In addition, it 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 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
Once the compound gets vaporized, they’re transported back again to the column on a steam of gases. This technique is called as the Mobile Phase of GC. headspace sampler concludes the purge and the trap process and then starts the chromatography process that occurs in the next manner:
The compounds firstly enter the column
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 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 are 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 environment. VOC analysis may 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 together with fragrances.
Conclusion
Purge and trap gas chromatography pays to 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 those who perform the purge and trap function.
Purge and trap gas chromatography is used to evaluate low level compounds. Purge and trap equipment can be purchased online or offline form suppliers at cheap prices. You are advised to choose quality products to retain preciseness of results and process. Since the functions derive from small elements, it is very important to keep the accuracy sharp right form start.