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三氧同位素(16O、17O、18O)组成特征可有效示踪天然水循环及其环境效应,微量水δ(17O)和δ(18O)CoF3法同时测试新技术的建立,可为三氧同位素定量研究提供有效的分析手段,特别是能够捕捉到像光合作用、呼吸作用等生物过程中发生的同位素分馏现象。在国内首次建立了微量水δ(17O)和δ(18O)CoF3法线外同时测试新技术,样品量仅需2μL,整个制样时间约40min。采用在质谱测试前对待测样品在100℃下预热10 min,待O2完全解吸后再进行质谱测试的方法,避免了制样和测试过程中的记忆效应及分馏效应,δ(17O)和δ(18O)的分析精度分别达到±0.07‰和±0.14‰。该法使用固体试剂CoF3替代了剧毒的气态氟化物BrF5,使得制样流程更加安全可靠且样品量少,适用性强,具有很大的推广应用价值。
The composition of the tri-oxygen isotope (16O, 17O, 18O) can effectively trace the natural water cycle and its environmental effects. The establishment of a new technique for simultaneous measurement of trace water δ (17O) and δ (18O) CoF3 can be used to quantitatively study the tri-oxygen isotope Provide an effective means of analysis, in particular, to capture isotope fractionations that occur during biological processes such as photosynthesis and respiration. For the first time in China, a new technique for simultaneous measurement of trace water δ (17O) and δ (18O) CoF3 was established. The sample volume was only 2μL, and the whole sample preparation time was about 40min. Before the mass spectrometry test, the sample to be tested was preheated at 100 ℃ for 10 min. After the O2 was completely desorbed, the mass spectrometry was used to avoid the memory effect and the fractionation effect during the preparation and testing. Δ (17O) and δ (18O) analysis accuracy of ± 0.07 ‰ and ± 0.14 ‰. The method uses the solid reagent CoF3 instead of the highly toxic gaseous fluoride BrF5, making the sample preparation process safer and more reliable, less sample and strong applicability, and has great promotion and application value.