电感耦合等离子体质谱仪等离子体内分析粒子的移动速率测量方法

基于等离子体内分析粒子原子发射光谱技术,建立了一套电感耦合等离子体质谱仪(ICP-MS)内钙元素的速率测量方法,并比较了在电感耦合等离子体质谱仪及发射光谱仪之间的分析粒子速率差别。结果表明:两取样点所得到的原子发射光谱谱图基本一致,后者信号较弱,可确认其来自于同一分析物气溶胶团,这说明通过记录两取样点处的荧光信号及移动所需时间,可有效测量高温等离子体内分析粒子的移动速率;ICP-MS取样锥后真空压力明显对等离子体内的分析粒子具有加速影响,尤其是在取样锥前0~3 mm区域内。实验结果可为改进ICP-MS取样界面传递效率设计提供实验数据支持。同时该装置可为测量高温环境内粒子移动速率提供一可行的技术方法。

Measurement method of analyte particles flow velocity in an inductively coupled plama mass spectrometer

A method for measurement of the flow velocity of calcium in inductively coupled plasma mass spectrometer (ICP-MS) was established based on the atomic emission spectrometry technique of analytical particles in plasma. The difference for the flow velocity of analytical particles in inductively coupled plasma mass spectrometer and emission spectrometer was compared. The results showed that the atomic emission spectra obtained in two sampling points were basically consistent and the signal for the latter was weaker. Therefore, it was verified that they were from the aerogel of the same analyte. As a results, it indicated that the flow velocity of analytical particles in high temperature plasma was measured effectively by recording the fluorescence signals for the two sampling points and the corresponding flow time. The vacuum pressure after sampling cone of ICP-MS had obvious accelerating effect on the analytical particles in plasma, especially the area with distance of 0~3 mm before the sampling cone. The experimental results could provide data support to improve the sampling interface transfer efficiency design for ICP-MS. Meanwhile, this equipment could also provide a feasible method to measure the flow velocity of particles in high temperature environment.