Measurement of δ18O and δ2H values of fluid inclusion water in speleothems using cavity ring-down spectroscopy compared with isotope ratio mass spectrometry

摘要: RATIONALE The hydrogen and oxygen isotopic analyses (δ2H δ18O values) of water trapped within speleothem carbonate (fluid inclusions) have traditionally been conducted utilizing dual-inlet isotope ratio mass spectrometry (IRMS) or continuous-flow (CF)-IRMS methods. The application cavity ring-down spectroscopy (CRDS) to the δ2H analysis in fluid inclusions has investigated at University Miami as an alternative method CF-IRMS. METHODS An extraction line was developed recover from consisting a crusher, sample injection port expansion volume (either 100 50 cm3) directly connected CRDS instrument. Tests were determine reproducibility standard injections crushes. In order compare results with conventional analytical methods, samples analyzed both (CRDS method) Vrije Universiteit Amsterdam (CF-IRMS method). RESULTS The crushed on Device demonstrates average external deviation 0.5 2.0 ‰ for values, respectively. Sample data are shown fall near global meteoric line, supporting validity method. Three different performance each laboratory. offset between two laboratories is 0.7 2.5 δ2H. CONCLUSIONS The advantage that system low-cost CF-IRMS inclusion analysis. acceptable precision good agreement These promising future Copyright © 2013 John Wiley & Sons, Ltd.