Gas chromatograph after peak injection solution

Gas chromatography is a quantitative and qualitative analysis. It can also determine the physical and chemical constants such as the partition coefficient, activity coefficient, molecular weight, and specific surface area of ​​the sample on the stationary phase. Therefore, it is widely used in petroleum, chemical industry, biochemistry, medicine and health, food industry, and environmental protection.

The gas chromatograph consists of an air source, a control unit, a sampling unit, a thermostat, and a column, and a display unit such as a detector and an automatic recorder. The chromatograph uses a column to separate the mixture first, and then uses the detector to sequentially detect the separated components. Gas chromatograph is a multi-component mixture separation and analysis tool. It is a column chromatographic technique using gas as mobile phase and flushing method. Gas chromatograph is often used in the use of the sample does not appear peak and other failures, how to solve it?

Instrument World World Network pointed out that the gas chromatograph has no change in the detection signal after the injection. When it is not out of peak, one-by-one detection and exclusion should be performed in a certain order, and the cause of the failure should be repaired.

1. Check if there is any problem with the syringe, such as clogging, etc., and check whether the graphite gaskets of the inlet and detector are leaky or if the column leaks.

2. Check if the sample concentration and sample injection amount are correct and if there are any problems.

3. Check the analytical conditions such as column temperature, injector temperature, detector temperature, and range settings.

4. Reduce the temperature of the column thermostat, after cooling the column, check whether the carrier gas system is normal, whether the carrier gas enters the instrument, so as not to damage the column or the contamination detector.

5, detector flame is normal. If the detector flame cannot be lit or is easily extinguished, check the ignition coil, ignition electrode, gas flow rate, TCD tungsten wire, and tungsten wire current settings to troubleshoot the problem.

6. Ensure that the various parts of the instrument are properly connected and operating normally, such as the connection of the ion signal lines to the detectors, the amplifier circuit board, the connection of the output signal lines to the instrument, the integrator/workstation, etc.

7. If it is impossible to normal zero, it is necessary to check the circuit system to eliminate faults, such as whether the signal line, amplifier circuit board, output signal line, integrator, etc. have failed.

8. It is also important to observe whether the detector outlet is open.