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 δ^(18O) in Micro-liter Water Samples by Thermal Conversion/Elemental Analysis-Isotope Ratio Mass Spectrometry

作　　者：刘运德[1,2] 甘义群[1,2] 余婷婷[1,2] 刘存富[1,2] 周爱国[1,2] 

机构地区：[1]中国地质大学环境学院,湖北武汉430074 [2]中国地质大学生物地质与环境地质教育部重点实验室,湖北武汉430074

出　　处：《岩矿测试》2010年第6期643-647,共5页Rock and Mineral Analysis

基　　金：国家自然科学基金项目资助(40602030;40772156;40972157)

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1δ8O,用样量仅需0.2μL;δD和1δ8O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H3+因子。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 δ^18O 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 δ^18O,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.

关 键 词：微量水 氢氧同位素组成 热转换元素分析同位素比质谱法 

分 类 号：O628[理学—有机化学] O628.11[理学—化学]