ポスター発表
- 第2日 6月23日（木） P会場（501，502，503）
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2P-33（2C-O1-1040） PDF
イオン-分子反応を用いたオンライン同重体干渉除去による87Sr/86Sr比分析手法の確立
In order to avoid the isobaric interference of 87Rb on 87Sr for 87Sr/86Sr isotope ratios, an analytical method has been developed using ICP-MS/MS, which can remove this interference inside of the instrument. Precise 87Sr/86Sr ratios were obtained by the internal correction of mass discrimination with 86Sr/88Sr through an adequate control of the ion-molecular reaction in the collision/reaction cell by optimizing the O2 flow rate and the kinetic energy of ions, without standard-sample bracketing techniques required in previous studies. Established technique was applied to several rock samples with various Rb/Sr ratios, ages and major element compositions, and consistent results with conventional methods were obtained in wide range of 87Sr/86Sr ratios.