The continuous-flow method for the determination of the O-isotope composition of solid samples has significant advantages over off-line extraction methods, but the problem has arisen of the standardization of results that has only partially been resolved by the use of water standards. We propose a new approach to standardization that uses carbothermic reduction of calcium carbonate standards catalyzed by high-purity AgCl. Analytical accuracy, precision, variance homogeneity and long-term stability are proven. Preliminary data on the barium sulfate δ18O analyses are reported, with a closer look at the different results obtained by off-line and on-line methods on intercomparison standards NBS-127 and MSS3. Copyright © 2005 John Wiley & Sons, Ltd.
Continuous-flow δ18O measurements: New approach to standardization, high-temperature thermodynamic and sulfate analysis / Boschetti, T.; Iacumin, P.. - In: RAPID COMMUNICATIONS IN MASS SPECTROMETRY. - ISSN 0951-4198. - 19:21(2005), pp. 3007-3014. [10.1002/rcm.2161]
Continuous-flow δ18O measurements: New approach to standardization, high-temperature thermodynamic and sulfate analysis
Boschetti T.;Iacumin P.
2005-01-01
Abstract
The continuous-flow method for the determination of the O-isotope composition of solid samples has significant advantages over off-line extraction methods, but the problem has arisen of the standardization of results that has only partially been resolved by the use of water standards. We propose a new approach to standardization that uses carbothermic reduction of calcium carbonate standards catalyzed by high-purity AgCl. Analytical accuracy, precision, variance homogeneity and long-term stability are proven. Preliminary data on the barium sulfate δ18O analyses are reported, with a closer look at the different results obtained by off-line and on-line methods on intercomparison standards NBS-127 and MSS3. Copyright © 2005 John Wiley & Sons, Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
