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摘要:
随着分析方法的发展和分析精度的提升，钒同位素已经越来越多地被用于各种地质过程研究。为了确保钒同位素分析测试过程中，可以有效地监控数据的准确度和精度，方便国际各实验室之间的数据对比，同时考虑到早期国际上常用美国地质调查局(USGS)的标准物质面临着库存不足等问题，本文采用多接收电感耦合等离子体质谱仪(MC-ICP-MS)测定了一系列国际地质标准物质和国家地质标准物质的钒同位素组成，δ51V值的测试精度优于0.08‰。本文选取的标准物质主要来自日本地质调查局(GSJ)和中国地质科学院地球物理地球化学勘查研究所(IGGE)，包括一个安山岩(JA-1)，三个玄武岩(JB-3、JB-1b和GBW07105)，一个辉长岩(JGb-1)，一个辉绿岩(GBW07123)以及一个土壤(GBW07454)，钒含量范围为77～635µg/g，涵盖了目前大部分火成岩和部分土壤等天然样品含量的范围。这些标准物质除了土壤GBW07454，其他标准物质的钒同位素组成未曾被报道。经测量表明，辉长岩标准物质JGb-1具有最高δ51V值，为−1.05‰±0.08‰，安山岩标准物质JA-1具有最低δ51V值，为−0.34‰±0.06‰，其余标准物质的δ51V值变化范围为−0.72‰～−0.81‰，均落在MORB范围内。本文对这些标准物质钒同位素组成的报道，丰富了钒同位素研究的标准物质数据库，有助于未来在更多领域开展钒同位素研究。
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关键词:
- 钒同位素 /
- 火成岩；MC-ICP-MS /
- 标准物质 /
- 高精度分析方法
Abstract:In order to ensure the accuracy and precision of data during the analysis of vanadium isotopes, and facilitate the comparison of data among laboratories internationally, considering the shortage of inventory for the commonly used reference materials from the United States Geological Survey (USGS), seven reference materials (JA-1, JB-3, JB-1b, JGb-1, GBW07105, GBW07123, and GBW07454) with unreported vanadium isotope composition were selected from the Geological Survey of Japan (GSJ) and the Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences (IGGE) and their vanadium isotopes were measured using MC-ICP-MS. Among these reference materials, the gabbro reference material JGb-1 has the highest δ51V value of −1.05‰±0.08‰, and the andesite reference material JA-1 has the lowest δ51V (−0.34‰±0.06‰). The δ51V values of the other reference materials range from −0.72‰ to −0.81‰, all falling within the MORB range. The reporting of the vanadium isotopic composition of these reference materials in this article will enrich the database of vanadium isotopic research and contribute to the future study of vanadium isotopes in more fields. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202405280123 . -
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表 1 地质标准物质和钒同位素标准溶液详细信息
Table 1. Detail information of reference materials and vanadium isotope reference solutions.
标准物质编号 样品类型 研制单位 δ51V推荐值
(‰)AA 纯钒溶液 Alfa Aesar公司 0.00 USTC-V 纯钒溶液 中国有色金属及电子材料分析测试中心 −0.07±0.08 BDH 纯钒溶液 BDH公司 −1.24±0.08 NIST-3165 纯钒溶液 美国国家标准与技术研究院(NIST) 0.7±0.08 GSP-2 花岗闪长岩 美国国家地质调查局(USGS) −0.62 BIR-1 玄武岩 美国国家地质调查局(USGS) −0.92 GBW07454 土壤 中国地质科学院地球物理地球化学勘查研究所(IGGE) −0.74 JA-1 安山岩 日本地质调查局(GSJ) / JB-3 玄武岩 日本地质调查局(GSJ) / JB-1b 玄武岩 日本地质调查局(GSJ) / GBW07105 玄武岩 中国地质科学院地球物理地球化学勘查研究所(IGGE) / JGb-1 辉长岩 日本地质调查局(GSJ) / GBW07123 辉绿岩 中国地质科学院地球物理地球化学勘查研究所(IGGE) / 注：USTC-V是由两瓶GSB(国家实物标准样品)单元素纯钒溶液混合均匀制备而成，表格中δ51V推荐值来源于Prytulak等(2011)［12］、Wu等(2016)［15］和Zeng等(2024)［44］。
Note: USTC-V is made by mixing two bottles of GSB (National Physical Standard Sample) single element pure vanadium solution evenly，and the recommended values for δ51V in the table are sourced from Prytual et al (2011)［12］，Wu et al (2016)［15］ and Zeng et al (2024)［44］.
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表 2 MC-ICP-MS仪器测量钒同位素的主要工作条件
Table 2. Operating conditions for vanadium isotopic determination of MC-ICP-MS instrument
工作参数 实验条件 射频功率 1160～1200W 冷却气流速 ～16L/min 辅助器气体流速 ～0.8L/min 样品气流速 0.85L/min 灵敏度 51V为200V/(μg/g) 锥 X截取锥和镍Jet样品锥 膜去溶系统 Aridus 3 进样速率 50μL/min 分辨率 中分辨率(＞5500) 法拉第杯 L4 L2 L1 C H2 H3 48Ti 49Ti 50V 51V 52Cr 53Cr 电阻 1011Ω 1011Ω 1011Ω 1010Ω 1011Ω 1011Ω
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表 3 地质标准物质的钒同位素组成测量结果
Table 3. Vanadium isotopic composition of geological reference materials from different laboratories and our date
标准物质编号 样品类型 V含量
(μg/g)δ51V
(‰)2SD n 文献来源 BIR-1 玄武岩 310 −0.91 0.03 3 本文研究 −0.94 0.15 52 Prytulak等(2011)［12］ −0.92 0.09 52 Wu等(2016)［15］ −1.05 0.22 7 Sossi等(2018)［20］ −0.96 0.03 3 Wu等(2018)［27］ −0.89 0.23 3 Hopkins等(2019)［22］ −1.01 0.08 3 Qi等(2022)［34］ GSP-2 花岗闪长岩 52 −0.60 0.02 3 本文研究 −0.63 0.1 6 Prytulak等(2011)［12］ −0.62 0.07 26 Wu等(2016)［15］ GBW07454 黄土 77 −0.78 0.06 12 本文研究 −0.74 0.08 12 Zeng等(2024)［44］
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表 4 7个地质标准物质的钒同位素组成测量结果
Table 4. Determined values of vanadium isotopic composition of seven geological reference materials
标准物质编号 样品类型 V含量
（μg/g）δ51V测定值
（‰）2SD
（‰，n=3）δ51V总平均值
（‰）总测试数据的2SD
（‰）GBW07454 黄土
(loess)77 −0.81a 0.06 −0.78
（−0.74*）0.06 （n=12）
（0.08*）−0.74a 0.04 −0.78a 0.01 −0.80a 0.04 GBW07123 辉绿岩
(diabase)268 −0.75a 0.07 −0.72 0.06 （n=15） −0.71a 0.02 −0.70b 0.01 −0.69a 0.07 −0.74b 0.02 JGb-1 辉长岩
(gabrro)635 −1.11a 0.03 −1.05 0.08 （n=9） −1.03a 0.04 −1.03a 0.03 GBW07105 玄武岩
(basalt)167 −0.83a 0.05 −0.80 0.06 （n=12） −0.82a 0.04 −0.78a 0.05 −0.77a 0.04 JB-1b 玄武岩
(basalt)214 −0.79a 0.10 −0.79 0.08 （n=9） −0.74a 0.04 −0.83a 0.08 JB-3 玄武岩
(basalt)372 −0.83a 0.06 −0.81 0.09 （n=9） −0.84a 0.04 −0.76a 0.07 JA-1 安山岩
(andesite)105 −0.35a 0.03 −0.34 0.06 （n=12） −0.37a 0.02 −0.33a 0.03 −0.30b 0.05 注：a代表相同样品粉末单独进行化学纯化得到的数据；b代表相同的溶液重复测试得到的数据；n代表单次测量次数；*代表Zeng等(2024)[44]报道的δ51V数据值。
Note: a. Data obtained from chemical purification of the same sample powder separately; b. Data obtained from repeated testing of the same solution;n. Single measurement frequency; *. The data values of δ51V reported by Zeng et al. (2024)[44].
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