How does gas chromatography work?
1. A mixture of chemicals in some unidentified liquid or gas, like a moving liquid mixture spread out because they travel at different speeds over a stationary solid.
2. As the liquid starts to move past the solid, some of its molecules (energetic things that are constantly moving about) are sucked toward the surface of the solid and stick there temporarily before being pulled back again into the liquid they came from.
3. This exchange of molecules between the surface of the solid and the liquid is a kind of adhesive or gluing effect called adsorption (with a d—don't confuse it with absorption, with a b, where molecules of one substance are permanently trapped inside the body of another).
4. Please note the liquid is actually a mixture of quite a few different liquids. Each one undergoes adsorption in a slightly different way and spends more or less time in either the solid or the liquid phase.
5. One of the liquids might spend much longer in the solid phase than in the liquid, so it would travel more slowly over the solid; another one might spend less time in the solid and more in the liquid, so it would go a bit faster.
6. Another way of looking at it is to think of the liquid as a mixture of glue-like liquids, some of which stick more to the solid (and travel more slowly) than others. This is what causes the different liquids within our original liquid mixture to spread out on the solid.
The main features of TOPTION brand gas chromatography machine:
1.Equipped with independent development of AFC, EPC flow control system, the PCM control module is more accurate.
2.Using vacuum fluorescent display screen, switching function in both English and Chinese language.
3.Multi-function keyboard operation, which can realize the comprehensive set of complex parameters and method.
4.Could store 10 chromatographic process.
5.Have external power supply voltage microcomputer test system and overtemperature protection system, traffic monitoring system, comprehensive guarantee instrument intelligent operation.
6.Has eight-channel high precision temperature control system and eight-channel external sequence of events function, independently finish the counteraccusation control of each unit.
7.FID、FPD autoignition function.
8.The pneumatic system can realize the constant pressure, constant current, constant speed, booster program, program flow and program litres six gas speed control mode.
9.Most can configure three detector at the same time, can collect and analysis the detection signal at the same time.
10.Equipped with diaphragm valve/VICI valve valve column switching system, a sample can complete the analysis of the petrochemical industry complex gas components.
11.Unlimited valve application program event editor, can implement precise switch settings for multiple sets of switching valve.
12.The whole circuit system have complete shielding protection function, the interference between each circuit unit decrease to a minimum.
13.Have two load integrity province pre operation and after operation mode, instrument operation cost greatly reduced.
14.The counteraccusation during whole process, supplemented by automatic sampler, which can realize the double towers automatic sample analysis.
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