The principle of chromatographic column is as follows: when the mobile phase containing sample passes through the stationary phase, the resistance of the stationary phase to different chemical substances is different, so the different chemical substances take different time to flow from the inlet to the outlet, so as to separate the different chemical substances. The separation degree, peak time and symmetry of different chemicals are affected by the composition of mobile phase, column temperature and pre column pressure. The best test conditions can be obtained by adjusting the influencing factors.<br>
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