Gas Chromatography
Gas chromatography allows a mixture of compounds to be separated.
The GC machine consists of a long glass tube packed with a powdered solid material, which is fitted into an oven.
The tube is called the column, even though it is usually wound into a coil so that it fits into the oven.

The sample is dissolved in a solvent, then injected into one end of the column.
An unreactive gas - usually nitrogen - carries the sample through the column.
Different substances in the sample travel through the column at different speeds and so become separated from each other.
The separated substances leave the column one after the other. As they leave, they are detected by a detector.

	Created by lmg719 over 11 years ago

Chemistry (Atomic Structure, Analysis and Quantitative Chemistry) Note on Anylising Substances, created by lmg719 on 05/05/2013.