Why does the gas chromatograph have an air peak?

That is, air is injected into the chromatography. I don't know what the analysis conditions are, and under what circumstances will there be empty peaks? Analysis and test encyclopedia network is happy to answer all kinds of questions you encounter in the experiment. Basically all questions can be answered. If you have any questions, you can come to me and search on Baidu.

Not all, only a few are caused by pressure fluctuation and dead volume air separation. It doesn't have to be like this.

If TCD detector is used, air peak will appear in manual injection, which may be caused by bubbles in the sample. Although it sometimes seems that the bubbles have been cleared, there are still air peaks in the injection.