Gas Chromatography

GC vaporizes liq. samples to separate the volatile components based on boiling points.

impurity detection, hydrocarbons, flavors & aromas, surfactants, petroleum products, Environmental monitoring

Measurements

GC makes possible to separate the volatile components of a very small sample based on boiling point and to determine the relative amount of each component present. A GC consists of a flowing mobile phase, an injection port, a separation column containing stationary phase, a detector, and a data recording system. Typically samples of 1 µL or less are injected on the column. These volumes can be further reduced by using what is called a split injection system in which a controlled fraction of the injected sample is carried away by a gas stream entering the column.

A Flame ionization detector (FID) is the most widely used detector for organic samples. FID, use an air / hydrogen flame to pyrolyze the effluent sample. The pyrolysis of the compounds in the flame creates ions. A voltage is applied across the flame and the resulting flow of ions is detected as a current. The detector shows a different response to each compound.

Equipment

GC: Shimadzu GC-2014

Detector Type: Flame Ionization (FID)

Mobile Phase: Hydrogen

Column: Restek column SHRXI-5MS. High Performance Fused Silica Capillary Column (non-polar 5% diphenyl 95% dimethyl-polysiloxane phase). Length = 15 m, inner diameter = 0.25 mm ID, film thickness = 0.25 µm. Typical applications: alcohols, amines, aromatic hydrocarbons,bile acids, drugs, USEPA methods, esters, fatty acids methyl esters (FAMEs), flavors and aromas, glycerides, halogenated hydrocarbons, herbicides, hydrocarbons, organic acids, oxygenates, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBS), pesticides, phenols, polymers, solvents, steroids, sugars, sulfur compounds

Temperature: 60 to 330 °C

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