微量进样/ICP-MS体系中的基体效应研究

考察了自行组装的高效微量进样系统在22μL/min低提升量下电感耦合等离子体质谱的基体效应.质量数和电离电位不同的基体元素质量浓度为2g/L时,低质量数分析元素受到一定的干扰,而对于高质量数分析元素,其信号几乎不受基体元素干扰,归一化信号值接近1.对于体积分数为5%的有机基体样品溶液,此微量高效雾化系统测得的归一化信号值多接近0.5.实际样品中常见的基体元素K,Na,Ca和Mg质量浓度低于500mg/L,以及乙醇和乙酸体积分数小于1%时,微量进样系统均不产生显著干扰.

Matrix Effects of Micro-sampling System for Inductively Coupled Plasma Mass Spectrometry

Matrix effects of inductively coupled plasma mass spectrometry(ICP-MS) with the self-installed micro-sampling system at 22 μL/min of solution uptake rate were studied. In the presence of 2 g/L matrix elements with different masses or ionization potentials, the signal intensity of analyzed elements was measured. For light analyzed elements, the interferences were observed; while for high mass analyte elements, the normalized intensity was close to 1. In the presence of 5% organic matrix, the normalized intensity was near to 0 5. When common elements such as K, Na, Ca, Mg at 500 mg/L or 1% organic solvents such as ethanol and acetic acid existed in the solution, the signals of analyzed elements were almost not affected. The results show that the micro-sampling system has a good capability of anti-interference to matrixes.