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刘运德, 甘义群, 余婷婷, 刘存富, 周爱国. 微量水氢氧同位素在线同时测试技术——热转换元素分析 同位素比质谱法[J]. 岩矿测试, 2010, 29(6): 643-647.
引用本文: 刘运德, 甘义群, 余婷婷, 刘存富, 周爱国. 微量水氢氧同位素在线同时测试技术——热转换元素分析 同位素比质谱法[J]. 岩矿测试, 2010, 29(6): 643-647.
LIU Yun-de, GAN Yi-qun, YU Ting-ting, LIU Cun-fu, ZHOU Ai-guo. Online Simultaneous Determination of δD and δ18O in Micro-liter Water Samples by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry[J]. Rock and Mineral Analysis, 2010, 29(6): 643-647.
Citation: LIU Yun-de, GAN Yi-qun, YU Ting-ting, LIU Cun-fu, ZHOU Ai-guo. Online Simultaneous Determination of δD and δ18O in Micro-liter Water Samples by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry[J]. Rock and Mineral Analysis, 2010, 29(6): 643-647.

微量水氢氧同位素在线同时测试技术——热转换元素分析 同位素比质谱法

Online Simultaneous Determination of δD and δ18O in Micro-liter Water Samples by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry

  • 摘要: 水中氢氧同位素组成的时空差异性,为水循环、古气候环境反演、水源识别等研究提供了一种非常有效的技术手段。文章采用热转换元素分析同位素比质谱法(TC/EA-IRMS),实现了在线单次分析过程中同时测定微量水的δD和δ18O,用样量仅需0.2 μL;δD和δ18O的分析精度分别为0.81‰和0.06‰。通过分类测试(δD值相差小于50‰的水样和标准水列为同一类进行测试)等措施可消除记忆效应,同时实现对测试结果的精确校正,而无需准确标定参考气和测定H+3因子。

     

    Abstract: Spatial and temporal variability of hydrogen and oxygen isotope compositions of water provides a very effective means for studying on the water cycle,inversion of the paleoclimate and paleo-environment, identification of water source, etc. This paper presents a method for online simultaneous determination of δD and δ18O in micro-liter water samples by thermal conversion/elemental analysis-isotope ratio mass spectrometry (TC/EA-IRMS). The sample size is reduced to only 0.2 μL of water and the determination precision are 0.81‰ and 0.06‰ for δD and δ18O respectively. Sample classification (classification based on δD difference between samples and standards <50‰) can eliminate memory effect and achieve accurate calibration for the determination results without carefully calibrating reference gases and measuring H+3-factor.

     

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