I have read a few articles where it is stated that samples containing water are detrimental for a GC experimental results and equipment.
For example, in the paper Identification of essential oil components by gas chromatography/mass spectrometry, ed. 4.1 by Robert P. Adams, it is written: "Oxygen and water can severely affect the mass spectrometer both in the quality of spectra obtained and in permanent damage to components such as the filament."
But why is it so damaging with water in a GC machine? What happens with the filament, and how is the column damaged?