Hydrogen isotope (D/H ratio) compositions of rocks are measured, after extraction (heating) under vacuum and reduction on hot uranium at 800°C. The quantities of hydrogen are generally about tenth of micromoles of H2, corresponding for instance to 300 mg of glass for concentration of ~ 2500 ppm H2O.
The analytical precision is about ±3 ‰. We can also measure water samples (e.g. for calibration of uranium furnaces) but the analyses are not optimized for large sample set.
For further information, feel free to contact Cyril Aubaud and Pierre Agrinier.