The upper spectrum shows the FID spectrum of the pure propylene glycol, while the lower spectrum is the mass spectroscopy spectrum for the pure sample. No impurities were detected, which in this case meant the column was clean.
The upper spectrum shows the FID spectrum of the pure propylene glycol, while the lower spectrum is the mass spectroscopy spectrum for the pure sample. No impurities were detected, which in this case meant the column was clean.
