See Also: Chromatography(medicine)
chromatography, gel(medicine)
chromatography, gas(medicine)
Chromatography, gas (GC)(health)
Gas chromatography (GC)(health)
chromatography(dictionary)
gas chromatography(medicine)
chromatography(encyclopedia)
gas chromatography (GC)(encyclopedia)
gas-liquid chromatography(medicine)

loper (iou) and gas chromatography (GC) (sh)


loper (iou)



loper noun. L15.
[from LOPE verb + -ER1.]
A leaper, a dancer. Only in L15.
Rope-making. A swivel on which yarns are hooked at one end while being twisted into cordage. L18.
Cabinet-making. A sliding rail to be pulled out to support the leaf of a bureau etc. M19.

gas chromatography (GC) (sh)




Type of chromatography with a gas mixture as the Mobile phase.

In a packed column, the packing or solid support (held in a tube) serves as the stationary phase (vapour-phase chromatography, or VPC) or is coated with a liquid stationary phase (gas-liquid chromatography, or GLC). In capillary columns, the stationary phase coats the walls of small-diameter tubes. The sample of gas or volatile liquid to be analyzed is injected into the inlet; its components move through with a carrier gas (usually hydrogen, helium, or argon) at rates influenced by their degree of interaction with the stationary phase. The temperature, Nature of the stationary phase, and column length can be varied to improve separation. The gas stream issuing from the column's end may pass through a thermal conductivity detector or a flame ionization detector, where its properties are compared with those of known Reference substances. GC is used to measure air pollutants, essential oils, gases or alcohol in blood, and composition of industrial process streams.