2. Inject the mixed solution 2 µl of 2% ethanol and hexanol into injection port of GC. Repeat of the injection steps until the retention time of each peak is stable. Record the retention time.
2. Inject the mixed solution 2 could l of 2% ethanol and hexanol into injection port of GC. Repeat of the injection steps until. The retention time of each peak is stable. Record the retention time.