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Continuous‐flow δ 18 O measurements: new approach to standardization, high‐temperature thermodynamic and sulfate analysis
Author(s) -
Boschetti Tiziano,
Iacumin Paola
Publication year - 2005
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.2161
Subject(s) - chemistry , standardization , homogeneity (statistics) , sulfate , accuracy and precision , stable isotope ratio , analytical chemistry (journal) , process engineering , chromatography , statistics , physics , mathematics , organic chemistry , political science , law , engineering , quantum mechanics
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 δ 18 O 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.