title: High-precision measurements of 17O/16O and 18O/16O of O2 and O2/Ar ratio in air.
abstract: A method for high-precision and high-accuracy mass spectrometric measurements of the ratios among the three oxygen isotopes, and of the O(2)/Ar ratio, is presented. It involves separation of the O(2)-Ar mixture from air and includes a fully automated system that ensures highly reliable sample processing. Repeated measurements of atmospheric oxygen yield the repeatability (+/-SE x t, standard error of the mean (n = 12) multiplied by Student's t-factor for a 95% confidence limit) of 0.004, 0.003 and 0.2 per thousand for delta(18)O, delta(17)O and delta O(2)/Ar, respectively.
authors.affiliation: The Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. eugenib@cc.huji.ac.il
authors.forename: Eugeni
authors.initials: E
authors.lastname: Barkan
authors.forename: Boaz
authors.initials: B
authors.lastname: Luz
mesh_terms: D000388:Air / Q000032:analysis*; D001128:Argon / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D019544:Equipment Failure Analysis; D013058:Mass Spectrometry / Q000295:instrumentation* / Q000379:methods*; D010100:Oxygen / Q000032:analysis*; D010103:Oxygen Isotopes / Q000032:analysis*; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D010103:Oxygen Isotopes; D001128:Argon; D010100:Oxygen