An improved CeO2 method for high-precision measurements of 17O/16O ratios for atmospheric carbon dioxide.
作者： Sasadhar Mahata , Sourandra K. Bhattacharya , Chung-Ho Wang , Mao-Chang Liang
DOI: 10.1002/RCM.6296
关键词:
摘要: RATIONALE The oxygen isotopic composition of carbon dioxide originating at the Earth's surface is modified in stratosphere by interaction with ozone which has anomalous isotope ratio (Δ17O = 1000 * ln(1 + δ17O/1000) – 0.522 1000 ln (1 + δ18O/1000) >0). The inherited anomaly provides a powerful tracer for studying biogeochemical cycles involving CO2. However, existing methods are either too imprecise or have difficulty determining small Δ17O variations found tropospheric In this study an earlier published CeO2 and CO2 exchange method been improved measuring values atmospheric high precision. METHODS The fraction from air samples was separated cryogenic means purified using gas chromatography. This first analyzed mass spectrometer, then artificially equilibrated hot to alter its isotopes mass-dependently re-analyzed. From these data 17O/16O 18O/16O ratios were calculated value determined. RESULTS The validity established several tests prepared zero non-zero values. CO2-H2O equilibrium slope also reproduced. CONCLUSIONS The CO2-CeO2 equilibration measure (Δ17O value) analytical precision ±0.12‰ (2σ). Copyright © 2012 John Wiley & Sons, Ltd.
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