电感耦合等离子体质谱法测定硼同位素丰度

以硼同位素标准物质NIST SRM 951配制标准溶液,在优化的仪器操作条件下对电感耦合等离子体质谱(ICP-MS)测定的硼同位素质量进行校正,求出校正因子,确定了样品的线性浓度范围,选定样品浓度为1.1 mg/L。在同样的仪器条件下首先测定了硼标准物质的硼同位素丰度比,测量误差为0.2%,然后测定了硼同位素浓缩过程中硼样品的硼同位素丰度比,测定结果的相对标准偏差为1.1%。此外考察了仪器的稳定性。实验结果表明本方法“记忆效应”小,结果可靠,测量精度高。

Determination of Boron Isotope Abundance by Inductively Coupled Plasma-Mass Spectrometry

Boron isotope mass bias of inductively coupled plasma mass spectrometry(ICP-MS) was corrected under optimal instrument by conditions using boron standard substance NIST SRM 951.The linear concentration range of the boron element was determined and the boron sample concentration was determined as 1.1 mg/L.Under the same optimal instrument conditions the measurement error of isotope abundance ratio of boron standard substance is 0.2%,and the isotope abundance ratio of boron sample was measured and the RSD is 1.1%.In addition the replicatability of ICP-MS was assessed.The experimental results show that the method of determining boron isotope abundance was reliable and the precision was high,while the memory effect in the ICP-MS system was eliminated.