| 硫酸盐17O和18O同时测试新技术：CO2-激光氟化法 |
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| 引用本文：甘义群,周爱国,刘存富.2005.硫酸盐17O和18O同时测试新技术：CO2-激光氟化法[J].地球学报,26(z1):48-50. |
| DOI：10.3975/cagsb.2005.s1.16 |
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| 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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| 中文摘要:目前的发现指出，硫酸盐的δ17O和δ18O值，特别是Δ17O值（＝δ17O-0.52δ18O）能够提供关于大气圈中和地表环境中硫酸盐的起源、混合和迁移的独特的信息，仅仅使用δ18O的测量结果不能圆满地解决相关间题。现有的分析硫酸盐的δ17O和δ18O的方法极其辛苦，而且要求高纯的BrF5。文中报道了从重晶石（BaSO4）中直接产生O2供同位素比值质谱计（IRMS）同时分析δ17O和δ18O的新方法。该方法使用了CO2-激光氟化系统，该系统也可用于从硅酸盐和氧化物中定量的产生O2。对于样品大于4 mg来说，可以获得部分的但是一致的来自BaSO4的氧的产量。每个工作日用该系统可以处理12个以上的样品。Δ17O的分析误差为±0.05‰, δ18O的分析误差为±0.8‰。该方法可有效和准确地研究硫酸盐的Δ17O值。 |
| 中文关键词:CO2-激光氟化法 硫酸盐 δ17O和δ18OΔ17O |
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| The CO2-Laser Fluorination Method：A New Technique for Simultaneous Determination of 17O and 18O in Sulfates |
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| Abstract: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. |
| keywords:CO2-laser fluorination method sulfate δ17O and δ18OΔ17O |
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