Questions about gas chromatography (thermal conductivity detector)
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1. What are the factors that affect the correction factor? 2. Why does an increase in column temperature cause the peaks to narrow? 3. What should be done if a component is not labeled by the system (i.e., it is not considered a peak) because its peak is too wide and its peak height is relatively low?
1. All basic parameter conditions have an impact. 2. Because the flow rate is high. 3. 1. Reset the area or peak height of the identified peak ； II. Manual calibration ；
As the column temperature increases, the mass transfer rate between the gas and liquid (or solid) phases of the sample speeds up, resulting in narrower peaks
The correction factor should be related to the properties of the substance itself; when the column temperature increases, the retention time decreases, and consequently the peak width becomes narrower. If the peak is not recognized, set the slope and peak width to smaller values, and then check the minimum area (we usually set this to 10)
The correction factor is related to the thermal conductivity of the substance. As the column temperature increases, the internal energy rises and the molecules move faster; as a result, the peaks appear earlier and the peak shape becomes narrower. This is related to the settings of the workstation, where the minimum peak area is set to a low value