Geo scientists use various methods to evaluate compounds in different substances. Gas chromatography is one such laboratory technique that makes it easier to separate mixtures for further study. Below is a brief guide to the process. 

What Is Gas Chromatography?

In analytical chemistry, this method of chromatography is used to separate compounds that can be vaporized. This allows geo scientists to analyze mixtures without the need to break them down. The process includes a mobile, or moving, phase, as well as a liquid stationary phase.

A sample of the mixture is first injected into a gas chromatograph machine with a syringe. The substance is then heated to vaporize it. After, a carrier gas, such as helium, hydrogen, or nitrogen, is applied to make it easier for the gases in the sample to flow through a column in the machine. The metal or glass column is typically filled with a boiling liquid. Components of the gas mixture separate once they make contact with the liquid. The individual components of the compound move out of the column and past an electronic detector, which pulls up all the substances in the mixture on a computer screen for geo scientists to analyze.  

What Are the Benefits?

Once a compound mixture is placed in a gas chromatography machine, it only takes a few minutes to get results. This means geo scientists can evaluate samples quickly for specific applications. The technique is often used to determine the volatility and thermostability of compounds used to create food flavors, herbicides, fragrances, pesticides, and hydrocarbons. It is also used to test purity of water and other substances that can be vaporized. When needed, testing can be done to identify specific components in a substance or prepare compounds.

To learn more about gas chromatography and additional techniques geo scientists use to test the purity of substances, reach out to the team at GeoTek Alaska. Since 2002, the technicians have been providing groundwater sampling, well monitoring, and additional solutions to clients throughout the state. To schedule a consultation with the Anchorage-based company, call (907) 569-5900. One of their dedicated geo scientists will be happy to explain how they can help with your project. Visit the company online for a closer look at their methods.