| Mg同位素标准参考物质SRM980的同位素不均一性研究 |
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| 引用本文：朱祥坤,何学贤,杨淳.2005.Mg同位素标准参考物质SRM980的同位素不均一性研究[J].地球学报,26(z1):12-14. |
| DOI：10.3975/cagsb.2005.s1.05 |
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| 基金项目:本文为国家自然科学基金重点项目（编号40331005）资助 |
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| 中文摘要:摘要SRM980是由美国标准物质与技术研究所研制的Mg同位素标准参考物质。运用MC-ICPMS Mg高精度测试方法，对该参考物质中的Mg同位素成分是否均一性进行了研究。在所测定的5片SRM980镁金属碎片的同位素成分存在明显的不均一性，其最大差异为δ25 Mg为1.08, δ26Mg为2.12，是该实验室Mg同位素测定外部精度的一个数量级以上。 |
| 中文关键词:MC-ICPMS Mg同位素 标准物质 SRM980 不均一性 |
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| Heterogeneity of Mg Isotope Composition in SRM980 |
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| Abstract:The Mg isotope composition of standard reference material SRM980 prepared by NIST has been investigated in some detail. It has been found that the Mg isotope composition in the material is largely heterogeneous. Among the 5 Mg metal chips analysed, variation in Mg isotope composition is up to 0.00032164 in 25Mg/24Mg，and 0. 00070216 in 26Mg/24Mg ratios. Thus this material is improper to be used as a standard reference for high-precision Mg isotope ratio measurement. |
| keywords:MC-ICPMS Mg isotopes standard reference materials SRM980 isotope Heterogeneity |
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