| 基于连续流同位素质谱的地下水无机物氯稳定同位素测试方法及影响因素研究 |
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| 引用本文： | 刘君,王莹,苏嫒娜,刘福亮,张琳.基于连续流同位素质谱的地下水无机物氯稳定同位素测试方法及影响因素研究[J].岩矿测试,2022(1):80-89. |
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| 作者姓名： | 刘君 王莹 苏嫒娜 刘福亮 张琳 |
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| 作者单位： | 中国地质科学院水文地质环境地质研究所, 河北 石家庄 050061;地下水科学与工程重点实验室, 自然资源部, 河北 石家庄 050061 |
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| 基金项目： | 国家自然科学基金项目（41502250）；中国地质科学院基本科研业务费项目（YK201810） |
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| 摘 要： | 氯稳定同位素作为示踪剂,能指示水体演化和探索地质环境变化,在地球科学领域具有广泛的应用前景.连续流同位素质谱法(CF-IRMS)具有样品用量少和灵敏度高的优点,被广泛应用于氯等稳定同位素的测试.氯甲烷作为一种易挥发的气体,在反应过程及测试管路中容易逸出,造成样品损失.如何减少反应及测试过程中氯甲烷的流失,实现氯甲烷的分...
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| 关 键 词： | 氯稳定同位素 连续流同位素质谱法 分离纯化 地下水 无机物 |
| 收稿时间： | 2021/8/9 0:00:00 |
| 修稿时间： | 2021/9/27 0:00:00 |
Determination of Chlorine Stable Isotopes in Groundwater Inorganics by Continuous Flow Isotope Mass Spectrometry Method and Analysis of Influence Factors |
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| LIU Jun,WANG Ying,SU Ai-n,LIU Fu-liang,ZHANG Lin.Determination of Chlorine Stable Isotopes in Groundwater Inorganics by Continuous Flow Isotope Mass Spectrometry Method and Analysis of Influence Factors[J].Rock and Mineral Analysis,2022(1):80-89. |
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| Authors: | LIU Jun WANG Ying SU Ai-n LIU Fu-liang ZHANG Lin |
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| Institution: | Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China;Key Laboratory of Groundwater Science and Engineering, Ministry of Natural Resources, Shijiazhuang 050061, China |
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| Abstract: | BACKGROUND:Stable chlorine isotope,as an effective tracer,can indicate the water evolution and explore the changes of the geological environment.It has a wide application prospect in earth science.The continuous flow isotope ratio mass spectrometry(CF-IRMS)method has been widely used in the determination of stable isotopes due to the advantages of smaller sample size and higher sensitivity.As a volatile gas,methyl chloride easily escapes during the reaction and the test pipeline,causing sample loss.How to achieve the separation and purification of CH3Cl and improve the conversion rate of CH3Cl of the samples in the reaction and analysis is the key to successful determination of stable chlorine isotopes by CF-IRMS.OBJECTIVES:To understand the influencing factors for the determination of CH3Cl by CF-IRMS.METHODS:The international standard material of chlorine isotope(ISL-354)was chosen as the standard material.The determination method of chlorine stable isotope content in groundwater was studied by using stable isotope ratio mass spectrometer(IRMS)analysis system combined with gas chromatography(GC)separation technology.Three types of samples from analytical pure,standard,and groundwater were chosen.RESULTS:By adopting the combined sampling method of GC manual injection and dual-channel reference gas injection,the loss of methyl chloride during the reaction and testing process was reduced,the concentration of methyl chloride during the online analysis was guaranteed,and better test accuracy was obtained.The results showed that the standard deviation of the 37Cl/35Cl ratio of the samples determined by this method was within the range of 0.20‰.The error of the results from different laboratories was less than 0.035‰,which satisfied the requirement of 0.5‰reproducibility of geological samples.Parameters such as light,temperature,sulfate removal,continuous helium flow and split ratio were the major factors affecting the test accuracy in the experiment.The influence of these parameters should be strictly controlled in the experiment to ensure the accuracy of this method.CONCLUSIONS:This method has the advantages of simple pretreatment,small sample consumption,large number of test samples and short test period,which can improve the efficiency of the analytical methods of the chlorine stable isotope of groundwater inorganics. |
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| Keywords: | chlorine stable isotope continuous flow isotope mass spectrometry separation and purification groundwater inorganics |
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