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利用激光氟化系统分析硅酸盐矿物的三氧同位素组成
Analysis of the Triple Oxygen Isotopic Compositions of Silicate Minerals by Using Laser Fluorination System

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文摘 本文报道了利用激光氟化系统对一系列硅酸盐标准矿物三氧同位素组成(δ~(17)O_(V-SMOW)、δ~(18)O_(V-SMOW)和Δ~(17)O)高精度的分析结果。由于目前国际上缺乏已知δ~(17)O_(V-SMOW)的标准物质,利用空气中O_2的Δ~(17)O和已知的参考气体δ~(18)O_(V-SMOW)对实验室参考气体的δ~(17)O_(V-SMOW)进行了标定;据此测定的标准矿物的Δ~(17)O结果与前人发表的利用V-SMOW直接标定参考气体δ~(17)O_(V-SMOW)的结果在误差范围内一致。被分析矿物的δ~(17)O_(V-SMOW)和δ~(18)O_(V-SMOW)之间展示了很好的质量控制分馏关系,其回归线的斜率和截距分别为0.525(± 0.006)和-0.160(± 0.05)。随着分析次数的增加,新纯化的BrF_5中NF_3的量会持续降低,这对更准确地把握 δ~(17)O_(V-SMOW)的测定条件具有重要意义。
其他语种文摘 The high precision triple oxygen isotopic compositions (δ~(17)O_(V-SMOW),δ~(18)O_(V-SMOW) and Δ~(17)O) of silicate minerals are analyzed by using a laser fluorination system. Because of the lack of mineral references with certified δ~(17)O_(V-SMOW),we calibrate the δ~(17)O_(V-SMOW) of our reference gas based on the Δ~(17)O of air O_2 and the known δ~(18)O_(V-SMOW) of the reference gas. Our results calibrated in this way are consistent within the analytical error range with those of the reference gas calibrated by other laboratories using the V-SMOW. Moreover,a single mass-dependent line with slope and intercept of 0.525 ± 0.006 and-0.160 ± 0.05,respectively,is shown in a δ~(17)O_(V-SMOW)-δ~(18)O_(V-SMOW) diagram of our analytical results. In addition,it is noticed that the amount of NF_3 in the newly purified BrF_5 will be gradually decreased along with the increase of numbers of analysis. This provides a way to reduce the isobaric interference from NF~+,and is helpful for establishing a better analytical procedure for the precise δ~(17)O measurement.
来源 矿物岩石地球化学通报 ,2016,35(3):448-453 【核心库】
DOI 10.3969/j.issn.1007-2802.2016.03.006
关键词 激光氟化系统 ; 硅酸盐矿物 ; 三氧同位素组成
地址

中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广州, 510640

语种 中文
文献类型 研究性论文
ISSN 1007-2802
学科 地质学
基金 国家自然科学基金项目 ;  中国科学院广州地球化学研究所135项目
文献收藏号 CSCD:5746447

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