Fast high-precision on-line determination of hydrogen isotope ratios of water or ice by continuous-flow isotope ratio mass spectrometry

Huber, C.; Leuenberger, M. (2003). Fast high-precision on-line determination of hydrogen isotope ratios of water or ice by continuous-flow isotope ratio mass spectrometry. Rapid communications in mass spectrometry, 17(12), pp. 1319-1325. Wiley 10.1002/rcm.1055

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A new fast high-precision on-line technique is described for the determination of hydrogen isotope ratios of water by continuous-flow mass spectrometry. For the first time H2/H2O-equilibration using a platinum catalyst has been used in a fully continuous process. A significant reduction in the H2/H2O-equilibration time is achieved by a complete vaporization of the water and by increasing the exchange temperature to 100°C. The analysis time is only ∼5 min/sample which includes equilibration and processing. Measurement precision and accuracy are better than 1‰ and sample consumption is only ∼5 μL. This new technique allows the measurement of a wide range of aqueous samples either in a semi-continuous way (discrete samples are injected one after another) or in a fully continuous way. This allows us, for the first time, to make continuous measurements of ice cores.

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