【摘要】 本文报导了对12个日本“火成岩系列”岩石标准样品的⁸⁷Sr/⁸⁶Sr比值和Rb、Sr含量的测定结果。Rb、Sr含量采用同位素稀释法测定,⁸⁷Sr/⁸⁶Sr比值单独取样经分离后由质谱计直接测量。对NBS-987和NBS-607标准样品⁸⁷Sr/⁸⁶Sr单次测定的分析精度和重复分析的再现性均好于0.03％,NBS-607中Rb、Sr含量测定结果与证书值的最大偏差小于0.6％。直接测定日本“火成岩系列”岩石标样的⁸⁷Sr/⁸⁶Sr,与同位素稀释法测定的结果吻合,用不同浓度的稀释剂在不同仪器上测定的Rb、Sr含量在实验误差范围内一致,表明测定的结果可靠。更多还原

【Abstract】 This paper reports the measurements of 87Sr/86Sr ratio and Rb\\ Sr contents on 12 GSJ ’Igneous Rock Series’ rock reference samples. The chemical separations were carried out in a clean laboratory. Rb and Sr contents were determined by isotope dilution with enriched 85Rb and 84Sr spikes 87Sr/86Sr ratios were directly measured in a separate sample aliquot after chemical separation. All the isotope ratio measurements were undertaken on a MAT-261 mass spectrometer. NBS 987 and 607 were used for monitoring the analytical process and instrument conditions. The precision and reproducibility for the 87Sr/86Sr measurements on the NBS standards are better than 0.03% while the uncertainty for Rb and Sr contents of NBS 607 are less than 0.6%. All show that the measured data of the GSJ standard samples are reliable.更多还原