METHODICAL STUDIES FOR D H-ISOTOPE ANALYSIS - A NEW TECHNIQUE FOR THEDIRECT COUPLING OF SAMPLE PREPARATION TO AN IRMS/

A new technique for the sample preparation and direct coupling to an I sotope Ratio Mass Spectrometer (IRMS) for the D/H-determination is des cribed. 1 mu l size samples of water are injected and reduced with chr omium metal in a novel reaction furnace. The hydrogen gas flows direct ly into the IRMS and is analysed (standard/sample comparison). The rep roducibility is about 1 parts per thousand. The accuracy of the techni que was proven by means of the IAEA-standard waters V-SMOW, GISP, SLAP .