碱土金属的强短脉冲供电空心阴极灯激发常规炬管电感耦合等离子体离子荧光光谱初步研究

初步研究了碱土金属Ca，Sr，Ba的强短脉冲供电空心阴极灯(HCMP HCL)激发“常规短炬管”电感耦合等离子体离子荧光光谱(ICP IFS)。使用HCMP HCL激发光源和较大的ICP功率，在“常规短炬管”ICP中只观测到离子荧光信号，而没有观测到原子荧光信号;在较低观察高度和较小ICP功率时，离子荧光信号较强。与常见的“加长炬管”ICP原子荧光相比，“常规短矩管”ICP中Ba的离子荧光光谱的检出限改善了50倍以上，而Ca，Sr则基本一致。实验中对Ca，Sr，Ba五条离子荧光谱线测量的相对标准偏差为0.6%～1.4%(n=10，0.1～0.2 μg·mL-1)。实验中考察了K，Al，P等共存元素对Ca，Sr，Ba的离子荧光信号的影响，初步探讨了共存基体元素对Ca，Sr，Ba离子荧光信号影响的原因。

High Current Microsecond Pulsed Hollow Cathode Lamp Excited Ionic Fluorescence Spectrometry of Alkaline Earth Elements in Inductively Coupled Plasma with a Fassel-Torch

High current microsecond pulsed hollow cathode lamp (HCMP-HCL) excited ionic fluorescence spectrometry (IFS) of alkaline earth elements in inductively coupled plasma (ICP) with a Fassel-torch has been investigated. In wide condition ranges only IFS was observed, whilst atomic fluorescence spectrometry (AFS) was not detectable. More intense ionic fluorescence signal was observed at lower observation heights and at lower incident RF powers. Without introduction of any reduction organic gases into the ICP, the limit of detection (LOD, 3sigma) of Ba was improved by 50-fold over that of a conventional pulsed (CP) HCL with the Baird sleeve-extended torch. For Ca and Sr, the LODs by HCMP-HCL-ICP-IFS and CP-HCL-ICP-AFS show no significant difference. Relative standard deviations were 0.6%-1.4% (0.1-0.2 microg x mL(-1), n = 10) for 5 ionic fluorescence lines. Preliminary studies showed that the intensity of ionic fluorescence could be depressed in the presence of K, Al and P.