离线平衡法与GC-IRMS联用测定水中δ18O

王道兵, 钟其顶, 刘明, 刘传贺, 黄占斌

王道兵, 钟其顶, 刘明, 刘传贺, 黄占斌. 离线平衡法与GC-IRMS联用测定水中δ18O[J]. 质谱学报, 2014, 35(4): 348-354. DOI: 10.7538/zpxb.2014.35.04.0348
引用本文: 王道兵, 钟其顶, 刘明, 刘传贺, 黄占斌. 离线平衡法与GC-IRMS联用测定水中δ18O[J]. 质谱学报, 2014, 35(4): 348-354. DOI: 10.7538/zpxb.2014.35.04.0348
WANG Dao-bing, ZHONG Qi-ding, LIU Ming, LIU Chuan-he, HUANG Zhan-bin. Determination of Oxygen Isotope Ratio of Water by GC-IRMS Using Off-Line Isotopic Exchange Equilibration[J]. Journal of Chinese Mass Spectrometry Society, 2014, 35(4): 348-354. DOI: 10.7538/zpxb.2014.35.04.0348
Citation: WANG Dao-bing, ZHONG Qi-ding, LIU Ming, LIU Chuan-he, HUANG Zhan-bin. Determination of Oxygen Isotope Ratio of Water by GC-IRMS Using Off-Line Isotopic Exchange Equilibration[J]. Journal of Chinese Mass Spectrometry Society, 2014, 35(4): 348-354. DOI: 10.7538/zpxb.2014.35.04.0348
王道兵, 钟其顶, 刘明, 刘传贺, 黄占斌. 离线平衡法与GC-IRMS联用测定水中δ18O[J]. 质谱学报, 2014, 35(4): 348-354. CSTR: 32365.14.zpxb.2014.35.04.0348
引用本文: 王道兵, 钟其顶, 刘明, 刘传贺, 黄占斌. 离线平衡法与GC-IRMS联用测定水中δ18O[J]. 质谱学报, 2014, 35(4): 348-354. CSTR: 32365.14.zpxb.2014.35.04.0348
WANG Dao-bing, ZHONG Qi-ding, LIU Ming, LIU Chuan-he, HUANG Zhan-bin. Determination of Oxygen Isotope Ratio of Water by GC-IRMS Using Off-Line Isotopic Exchange Equilibration[J]. Journal of Chinese Mass Spectrometry Society, 2014, 35(4): 348-354. CSTR: 32365.14.zpxb.2014.35.04.0348
Citation: WANG Dao-bing, ZHONG Qi-ding, LIU Ming, LIU Chuan-he, HUANG Zhan-bin. Determination of Oxygen Isotope Ratio of Water by GC-IRMS Using Off-Line Isotopic Exchange Equilibration[J]. Journal of Chinese Mass Spectrometry Society, 2014, 35(4): 348-354. CSTR: 32365.14.zpxb.2014.35.04.0348

离线平衡法与GC-IRMS联用测定水中δ18O

Determination of Oxygen Isotope Ratio of Water by GC-IRMS Using Off-Line Isotopic Exchange Equilibration

  • 摘要: 水中氧稳定同位素比值(δ18O)测定在研究地球水圈循环和鉴别食品真实性领域具有重要作用,准确、方便的分析技术是进行上述研究的基础保障。本工作建立了气相色谱-稳定同位素比值质谱(GC-IRMS)联用,离线同位素交换平衡测定水中δ18O的方法,并考察了进样针记忆效应及稳定性、反应瓶密封性、充气装置稳定性和交换平衡条件对水中δ18O的影响。该方法所分析的水中δ18O的标准偏差为0.1‰,相同水样的分析结果与GasBench II-IRMS法具有良好的相关性,目前该技术已获得欧洲同位素分析实验室的认可。
    Abstract: Oxygen isotope ratio (δ18O) of water is a valuable character for the study of water cycle and food authenticity assessment, which need accurate, convenient analysis techniques. A method of gas chromatography-isotope ratio mass spectrometry (GC-IRMS) coupled with off-line isotopic exchange equilibration was developed for the determination of oxygen isotope ratio of water. The memory effect of the syringe, the tightness of spetum-sealed sample vials, the stability of the air charging system and the influence of reaction conditions for isotopic exchange equilibration were tested. Results show that no memory effect is observed, and the method is stable and convenient for the determination with a standard deviation usually better than 0.1‰. As to accuracy, a strong positive correlation is found in the δ18O values measured by GasBench II-IRMS, and it is recognized by top isotopic analysis laboratories in Europe.
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  • 刊出日期:  2014-07-19

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