Discussion on the space transfer behavior of analysis ion after sampling cone of inductively coupled plasma mass spectrometer
MA Hai-bin1,SUN Zi-jie*2
1.College of Chemistry, Chemical & Environmental Engineering, Weifang University, Weifang 261061, China; 2.Institute for Environmental Reference Materials, Ministry of Environmental Protection, Beijing 100029, China
Abstract：The improvement of analytical sensitivity of inductively coupled plasma mass spectrometer (ICPMS) was affected by the matrix interference. In order to better understand this problem, the mass control transfer behaviors of barium and calcium ions after sampling cone of ICPMS were investigated by laser induced fluorescence technology. The radial distribution of analysis ion at and after sampling cone was compared. The influence of ICP power, atomization gas flow and matrix interference on the spatial distribution of analysis ion after sampling cone was discussed. The results showed that the distribution of calcium and barium ions at sampling cone was similar. However, the diffusion behavior after sampling cone was related to relative atomic mass. The element with smaller relative atomic mass exhibited faster radial diffusion, so the detection sensitivity of instrument was lower. The higher atomization gas flow was, the lower the transfer efficiency of analysis ion was. Therefore, the higher sampling rate may not correspond to the higher detection sensitivity in ICPMS application. The radial distribution and the number of analysis ion was also affected by the matrix. Meanwhile, the number of analysis ion in central axis after sampling cone was reduced by the matrix interference. As a result, the radial distribution became more flat, and the probability passing through the skimmer cone was lower, which finally decreased the signal of analysis ion.
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MA Hai-bin,SUN Zi-jie. Discussion on the space transfer behavior of analysis ion after sampling cone of inductively coupled plasma mass spectrometer. , 2015, 35(9): 8-13.
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