| 离线平衡法与GC-IRMS联用测定水中δ18O |
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| 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. |
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| 作者姓名： | 王道兵 钟其顶 刘明 刘传贺 黄占斌 |
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| 作者单位： | 1. 中国矿业大学(北京)，化学与环境工程学院，北京100083；2. 中国食品发酵工业研究院，北京100027；3. 全国食品发酵标准化中心，北京100027 |
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| 基金项目： | 国家自然科学基金(31101333);国家支撑计划项目(2012BAK17B11);科技部国际合作项目(2011DFA33270);质检总局项目(2013IK188)资助 |
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| 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。
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| 关 键 词： | 气相色谱-稳定同位素比值质谱（GC-IRMS） 同位素交换平衡 &delta 18O 水 |
Determination of Oxygen Isotope Ratio of Water by GC-IRMS Using Off-Line Isotopic Exchange Equilibration |
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| 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. |
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| Authors: | WANG Dao-bing ZHONG Qi-ding LIU Ming LIU Chuan-he HUANG Zhan-bin |
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| Affiliation: | 1. School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;2. China National Institute of Food and Fermentation Industries, Beijing 100027, China;3. National Standardization Center of Food & Fermentation Industry, Beijing 100027, China |
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| 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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| Keywords: | gas chromatography-isotope ratio mass spectrometry (GC-IRMS) isotopic exchange equilibration &delta 18O water |
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