Method and apparatus for determining the isotope ratio of 18 O to 16 O and 15 N to 14N

摘要

Process for determining the isotopic ratios of 18O and 1O and 15N and 14N using mass spectrometry comprises feeding a sample to a pyrolysis unit in a protective gas having a mass number which is different from the mass of the molecules to be detected. An independent claim is also included for an apparatus for determining the isotopic ratios of 18O and 1O and 15N and 14N using mass spectrometry comprising a mass spectrometer, a pyrolyzer (2) connected to the spectrometer, a sample input device (1), a sample receiver, and a hood (4) which encloses the inlet region of the pyrolyzer tube (3), the sample input device and the sample receiver.