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This needs to be determined according crimp gas chromatography vials to the state of the sample you are analyzing. If it is liquid, please use liquid automatic injection, which can realize automatic operation, reduce artificial injection error and reduce manual operation cost.
If it is a gas sample, please use valve injection, not only quantitative reproducibility, but also can be isolated from the ambient air to avoid air contamination of the sample.
Manual injection with a syringe is difficult to achieve the above two points.
This is the end of the introduction of Quantitative analysis of gas chromatography is the method to accurately inject. I hope it can help you.