Аннотация:A sample holder is performed as a well thermoisolated plate with two openings filled with analyzed liquids. The holder is cooled by a liquid nitrogen when volatile liquids are analyzed. The device excludes sample contamination and ensures the reproducibility of mass spectra measurements at the level of 2-3%. It is noted that the developed method ensures as well the reproducibility of the relative intensity distribution in mass spectra but as the absolute intensity in the spectra.