利用多接收器电感耦合等离子体质谱法精确测定天然岩石样品中的铼含量

李 杰; 梁细荣; 董彦辉; 涂湘林; 许继峰

利用多接收器电感耦合等离子体质谱法精确测定天然岩石样品中的铼含量

1.
中国科学院同位素年代学与地球化学重点实验室,广东广州 510640
2.
中国科学院研究生院,北京 100039

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通讯作者:
李杰

中图分类号: O 657.63
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出版历程
- 收稿日期: 2007-11-19
- 修回日期: 2008-03-24
- 刊出日期: 2008-09-19

Precise Measurement Re Concentration of Natural Rock Sample by MC-ICPMS Using Iridium to Correct for Mass Fractionation

1.
Key Laboratory of Isotope Geochronology and Geochemistry,Chinese Academy of Sciences, Guangzhou 510640, China
2.
Graduate School of Chinese Academy of Sciences, Beijing 100039, China

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Corresponding author:
LI Jie

摘要

摘要: 利用多接收器电感耦合等离子体质谱（MC-ICPMS）精确测定了天然岩石样品的铼含量。在膜除溶雾化进样条件下，铼测试样品中加入铱标准溶液，通过在线监控铱同位素的质量分馏行为来校正铼同位素的质量分馏。实验发现，铼和铱的质量分馏系数（f_Re和 f_Ir）是不相等的，如果认为 f_Re=f_Ir，将会导致¹⁸⁷Re/¹⁸⁵Re同位素比值偏低，但是 f_Re/f_Ir比值固定不变，这样可以通过已知的 f_Ir计算出 f_Re，从而得到准确的¹⁸⁷Re/¹⁸⁵Re同位素比值。本工作利用这种经验的质量分馏校正方法，精确的测定出天然铼标准样品的¹⁸⁷Re/¹⁸⁵Re同位素比值为1.674 3±0.000 1（2σ, n=25），该结果与国际纯粹与应用化学委员会（IUPAC）推荐值（1.674 0±0.001 1）以及与N-TIMS测定值（1.675 ±0.001 4）在误差范围内一致。而且，采用该经验的质量分馏校正方法测得的天然铼标准样品的¹⁸⁷Re/¹⁸⁵Re同位素比值与采用 f_Re=f_Ir校正结果相比，准确度和外部重现性都明显提高。最后采用该方法准确测定出了天然岩石中Re含量，该结果与N-TIMS测定结果吻合。
- 多接收器电感耦合等离子体质谱（MC-ICPMS） /
- 岩石样品 /
- 铼含量 /
- 铼同位素比值
Abstract: This study reported a measurement method of high-precision rhenium isotope ratio, ¹⁸⁷Re/¹⁸⁵Re, and Re concentration of natural rock samples were measured by multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) through measuring the amount of fractionation on admixed lridium. It recognizes that the mass fractionation of MC-ICPMS appears to follow the exponential law, and the fractionation coefficients of Re and Ir are not identical, but the ratio of f_Re/f_Ir is constant during an analytical session. Thus, this constant ratio can be used to calculate the value of f_Re according to known value f_Ir. Replicate analyses of both Re natural standard and ¹⁸⁵Re enriched spike determined by MC-ICPMS are consistent with those measured by negative thermal ionization mass spectrometry (N-TIMS). ¹⁸⁷Re/¹⁸⁵Re ratios of the Re natural standard is 1.674 3±0.000 1(2σ, n=25）. The value is indistinguishable within analytical uncertainty from the value adopted by IUPAC (1.674 0±0.001 1), and is also in agreement with those measured by N-TIMS (1 675 5±0.001 4) . In addition, the precise and accurate are improved by using this empirical correction technique. The Re concentration of the natural rock samples are reasonable agree with those measured by N-TIMS.
- MC-ICPMS /
- rock sample /
- Re concentration /
- Re isotopic ratio

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参考文献(20)

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利用多接收器电感耦合等离子体质谱法精确测定天然岩石样品中的铼含量

通讯作者: 李 杰

计量

出版历程

Precise Measurement Re Concentration of Natural Rock Sample by MC-ICPMS Using Iridium to Correct for Mass Fractionation

Corresponding author: LI Jie

计量

出版历程

目录

通讯作者:
李杰

Corresponding author:
LI Jie