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

摘要

Process for determining the isotopic ratios of 1>8>O and 1>O and 1>5>N and 1>4>N 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 1>8>O and 1>O and 1>5>N and 1>4>N 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.