| 硫酸盐17O和18O同时测试新技术：CO2-激光氟化法 |
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| 关键词:CO2-laser fluorination method sulfate δ17O and δ18OΔ17O |
| 基金项目:本文为国家自然科学基金项目（编号：40372112）资助。 |
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| The CO2-Laser Fluorination Method：A New Technique for Simultaneous Determination of 17O and 18O in Sulfates |
| Recent findings indicate that δ17O and δ18O values of sulfates, especially the Δ17O value（=δ17O-0.52δ18O)，can provide independent information for tackling such problems as the origin, mixing and transformation of sulfates in the atmospheric and surface environments, which cannot be solved only by δ18O measurements. The methods available for analyzing δ17O and δ18O of sulfates are extremely laborious and demand high-purity BrF5. Here the authors present a new method which generates O2 directly from barite (BaSO4）for simultaneous analysis of δ17O and δ18O by isotope ratio mass spectrometry ( IRMS)．The method utilizes a CO2-Laser Fluorination system that can also be used to quantitatively generate O2 from silicates and oxides. Partial but consistent oxygen yields from BaSO4 are obtained for samples of >4 mg. The system may treat more than a dozen samples per working day, with the analytical error being ±0.05‰ and±0.8‰ for δ17O and δ18O, respectively. With this new method, we can effectively and accurately study Δ17O values of sulfates. |
| CAN Yiqun,ZHOU Aiguo,LIU Cunfu.2005.The CO2-Laser Fluorination Method：A New Technique for Simultaneous Determination of 17O and 18O in Sulfates[J].Acta Geoscientica Sinica,26(z1):48-50. |
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