ICP-MS检测三氟化硼-苯甲醚配合物中11B同位素的丰度

建立了基于ICP-MS技术测定三氟化硼-苯甲醚配合物样品中¹¹B同位素丰度的分析检测方法。采用酸碱交替洗涤方法减少记忆效应对¹¹B同位素丰度测定的影响,采用标准品-样品溶液交叉测量方法降低质量歧视效应的影响。实验结果表明,当样品溶液的硼浓度在2.62~17.49 mg/L时,采用3.50 mg/L的标准品进行交叉测量,测量后采用8次酸碱交替洗涤,可大大减小同位素记忆效应和质量歧视效应。分析多次测量标准品溶液的结果表明,该方法的精密度低于0.1%,绝对偏差低于0.8%,平均回收率为101.0%。按照所建立的方法测定3份不同硼浓度的三氟化硼-苯甲醚配合物样品溶液,¹¹B同位素丰度的相对标准偏差(RSD)均低于0.05%。与目前现有的其他ICP-MS检测方法相比,该方法具有前处理简单快捷、测量精密度高的优势,可为富集¹¹B同位素的实验研究提供基础。

Detection of 11B Isotope Abundance in Boron Trifluoride-anisole Complex by ICP-MS

An analytical method for the determination of ¹¹B isotope abundance in boron trifluoride-anisole complex samples based on ICP-MS technology has been established.The acid-base alternate washing method was used to reduce the influence of the isotope memory effect on the determination of ¹¹B isotope abundance,and the standard-sample solution cross-measurement method was used to reduce the mass discrimination effect.The results showed that when the boron concentration of the sample solution was in the range of 2.62~17.49 mg/L,using 3.5 mg/L standard solution and 8 times alternating acid-base washings could greatly reduce the isotope memory effect and mass discrimination effect.The analysis results indicated that the precision of the method was less than 0.1%,the absolute deviation was less than 0.8%,and the average recovery rate was 101.0%.The ¹¹B abundance in three BF₃-anisole complex samples with different concentrations are determined according to the established method,and the relative standard deviations(RSD)were all less than 0.05%.Compared with other existing ICP-MS detection methods,the method in this research showed good precision with simplified operation,which can provide a basis for experimental research on enrichment of ¹¹B isotope.