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    Volume 46 Issue 12
    Dec.  2021
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    Article Navigation >  Earth Science  > 2021  >  46(12): 4470-4479
    Zhang Jianfeng, Liu Hanbin, Shi Xiao, Jin Guishan, Han Juan, Li Junjie, Zhang Jia, Guo Dongqiao, 2021. High Reaction Temperature Influence on Determination of Oxygen Isotopic Composition by BrF5 Method. Earth Science, 46(12): 4470-4479. doi: 10.3799/dqkx.2021.052
    Citation: Zhang Jianfeng, Liu Hanbin, Shi Xiao, Jin Guishan, Han Juan, Li Junjie, Zhang Jia, Guo Dongqiao, 2021. High Reaction Temperature Influence on Determination of Oxygen Isotopic Composition by BrF5 Method. Earth Science, 46(12): 4470-4479. doi: 10.3799/dqkx.2021.052
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    High Reaction Temperature Influence on Determination of Oxygen Isotopic Composition by BrF5 Method

    doi: 10.3799/dqkx.2021.052

    • Beijing Research Institute of Uranium Geology, Beijing 100029, China

    • Received Date: 2021-01-12
    • Publish Date: 2021-12-15
      Abstract
    • Reaction temperature and reaction time are key factors for the determination of oxygen isotopic composition of oxides and silicate minerals by BrF5 method. This work aims to study the effect of the higher temperature (550-800℃) on the oxygen isotopic composition analysis by BrF5 method. The national standard sample GBW04409 for oxygen isotopic composition were prepared and analyzed at high reaction temperatures. The results show that sufficient yields of O2 could be achieved when sample was reacted with BrF5 at 550-675℃, under which condition the δ18O value fell in the range of 10.4‰-11.8‰ with high accuracy. However, when the reaction temperature was higher than 700℃, the yields of O2 were low, and the δ18O values were in the range of 10.8‰-26.8‰, which had a significant positive deviation to the given δ18O values. To solve the problem due to effect of the higher temperature, fractional fluorination was conducted. The results of oxygen isotopic composition obtained were consistent with the recommended value when the oxygen liberated after each time fluorination was all collected. The consumption of BrF5 by the nickel reactor at higher temperature results in the insufficient amount of BrF5 reacted with the sample, which causes the low yield of O2, thus the fractionation of oxygen isotope.

       

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