English abbreviation for gas chromatography

Gas chromatography English abbreviation GC

Data expansion:

Gas chromatography is a chromatographic separation and analysis method with gas as mobile phase. The vaporized sample is brought into the chromatographic column by carrier gas (mobile phase), and the molecular forces of the components in the column are different, and the components flow out of the chromatographic column at different times, so the components are separated from each other.

Using an appropriate identification and recording system, make a chromatogram showing the time and concentration of each component flowing out of the chromatographic column. According to the peak time and sequence shown in the figure, the compounds can be qualitatively analyzed; According to the height and area of the peak, the compound can be quantitatively analyzed.

It has the characteristics of high efficiency, high sensitivity, strong selectivity, fast analysis speed, wide application and simple operation. It is suitable for qualitative and quantitative analysis of volatile organic compounds.

Non-volatile liquids and solid substances can be analyzed by pyrolysis and gasification at high temperature. It can be combined with red light and absorption spectrum or mass spectrometry, and chromatography is a means to separate complex samples with high accuracy. In judicial expertise, the detection of organic matter is an important analytical means.

Gas chromatography is a kind of chromatography. There are two phases in chromatography, one is mobile phase and the other is stationary phase. If liquid is used as the mobile phase, it is called liquid chromatography, and gas is used as the mobile phase, it is called gas chromatography.

Because of the different stationary phases used, gas chromatography can be divided into two types: gas-solid chromatography with solid adsorbent as stationary phase and gas-liquid chromatography with monomer coated with stationary liquid as stationary phase.

According to the principle of chromatographic separation, gas chromatography can also be divided into adsorption chromatography and partition chromatography. In gas-solid chromatography, stationary phase is adsorbent, gas-solid chromatography belongs to adsorption chromatography, and gas-liquid chromatography belongs to partition chromatography.

Gas chromatography belongs to column chromatography according to the chromatographic operation form, and can be divided into general packed column and capillary column according to the thickness of the chromatographic column used. Stationary phase is usually packed in glass or metal tube with inner diameter of 2 ~ 6 mm, and capillary column can be divided into hollow capillary column and packed capillary column.

Hollow capillary column is a kind of glass or metal capillary with inner diameter of only 0. 1 ~ 0.5mm, and packed capillary column is developed in recent years. Some porous solid particles are put into a thick-walled glass tube, and then heated and stretched to make a capillary tube with an inner diameter of 0.25-0.5 mm. ..