Gas chromatography - method of analysis, to get a very good theoretical development.That careful study of its theoretical and practical foundations contributed in recent decades, the rapid development of this technique.
known that GC different from other methods in that it as the mobile phase gas is used.The stationary phase can be a solid or liquid.Depending on this suggests adsorption gas or gas-liquid chromatography.
separation of mixtures of substances in devices such as a gas chromatograph, is due to the repetitive process of distribution of the components between the stationary liquid or solid phase and the gas moving.The separation process is based on differences in volatility and the solubility of analytes.One component, the volatility at the temperature of which is greater and smaller than the solubility of the stationary phase will move through the column faster.
Using gas as the carrier rolling allows to obtain advantages such as the precision of separation of constituent parts and the speed of analysis.Test sample is introduced into the column in gaseous form or in the form of steam.With this method it is possible to analyze not only gases but also liquid and solid substances, which translate into the desired state by heating.In this regard, in gas chromatography the temperature at which the whole process is very important.Performance limits for gas adsorption analysis method ranges from 70 to 600 ° C, and the gas-liquid - from 20 to 400 ° C.Industry produces a gas chromatograph, which allows pre-programmed temperature.
This method makes it possible to analyze the substance having a molecular weight less than 400. They do not decompose during evaporation and the subsequent condensation does not change its composition.
mainly in analytical practice using gas-liquid chromatography.Compared to gas adsorption, it has some advantages, which are mainly associated with a wide range of possible liquid stationary phases, as well as high purity, which is important with the homogeneous fluid.
Gas Chromatography - a rapid method, featuring high accuracy, sensitivity and the possibility of automation.The versatility and flexibility of the method used to determine the particular case the device.Gas chromatography is used for quantitative analysis provides unambiguous results, that is not in doubt.
This method allows us to solve many of the analytical problems, to share and to determine the ratio of compounds with a minimum difference in vapor pressure.A method of gas chromatography is used to purify chemicals cleavage mixtures into individual components.It is particularly effective in the separation of similar composition substances which belong to the same class: organic acids, alcohols, hydrocarbons.
