Pyrolysis oven: HTO (HEKAtech, Wegberg, Germany)
Interface: ConFlo IV (Thermo Fisher Scientific, Bremen, Germany)
Isotope ratio mass spectrometer: delta V advantage (Thermo Fisher Scientific, Bremen, Germany)
This instrument coupling is being used for the simultaneous determination of H/D and O isotope abundances (δD, δ18O) in the natural abundance range and of H and O concentrations in organic and inorganic solid and liquid samples. Homogenised solid samples are weighed into silver capsules, tightly closed and introduced into the pyrolysis oven via an autosampler. A separate autosampler is available for the injection of liquid samples. The samples are thermal converted under oxygen-free conditions in the pyrolysis oven. This leads to a conversion of hydrogen and oxygen compounds into H2 or CO, respectively. These gases are purified in a chemical trap and subsequently separated by gas chromatography. Helium serves as carrier gas. In an interface H2 or CO standard gas with known isotope abundance is introduced into the gas stream. The relative abundances of the isotopes H and D or 18O and 16O, respectively, are subsequently being analysed by isotope ratio mass spectrometry.