Supported by. Venezuelaâs economy is dominated by the oil industry, and it has the largest proven reserves of crude oil in the world. President Hugo Chavez, who was elected in 1998 on a populist platform, consolidated state control over the economy and nationalized its telephone and electricity companies.
Chromatography (/ËkroÊmÉËtÉÉ¡rÉfi/ ; from Greek ÏÏá¿¶Î¼Î± chroma which means color and Î³ÏÎ¬ÏÎµÎ¹Î½ graphein to write) is the collective term for a set of laboratory techniques for the separation of mixtures.he purpose of preparative chromatography is to separate the components of a mixture for more advanced use (and is thus a form of purification). Analytical chromatography is done normally with smaller amounts of material and is for measuring the relative proportions of analytes in a mixture.
The two main chromatographic techniques used in modern analytical chemistry are Gas. Chromatography (GC) and High Performance Liquid Chromatography (HPLC). HPLC uses a liquid mobile phase to transport the analytes (sample) through the column, which is packed with a stationary phase material. In contrast, Gas Chromatography uses a gaseous mobile phase to transport sample. components through either packed columns or hollow capillary columns.