Abstract：In order to enhance the detection sensitivity of inductively coupled plasma source mass spectrometer (ICP-MS), it is very important to understanding the influence of sampling cone in ICP excitation source on the ionization mechanism of analytical elements. The space distribution difference of barium atom, ground state and metastable ion in plasma of ICP-MS and inductively coupled plasma atomic emission spectrometer (ICP-AES) was investigated by means of laser induced fluorescence technology. The influence of sampling cone on atomization and ionization mechanism of analytical elements was discussed. The insertion of water-cooling sampling cone had more complex influence on the axial distribution of analytical elements in ICP-MS compared to that in ICP-AES. The fluorescence signals of barium atoms and ions decreased significantly within 0-2 mm before sampling cone,which was due to the influence of sampling cone on temperature of plasma as well as the acceleration effect of vacuum pressure in the first vacuum chamber on analytical elements. In range of 2-10 mm before sampling cone, the number density of monovalent barium ions increased significantly cue to the presence of sampling cone. Therefore, it could be concluded that there were a lot of divalent barium ions in high temperature plasma. In ICP-MS,the enhanced fluorescence signal of monovalent barium ions was due to the mutual transformation among neutral atoms,monovalent and divalent ions.
马海斌, 张运臣, 王林同. 平面激光诱导荧光法研究取样锥下电感耦合等离子体的离子空间分布[J]. 冶金分析, 2017, 37(11): 12-16.
MA Hai-bin, ZHANG Yun-chen, WANG Lin-tong. Study on ion space distribution of inductively coupled plasma under sampling cone by planar laser induced fluorescence method. , 2017, 37(11): 12-16.
马海斌,张彭.分析元素在ICP-MS取样锥口的空间分布[J].质谱学报,2016,37(1):84-87.MA Hai-bin,ZHANG Peng.Spatial investigation of analytes at the sampling cone of an ICP-MS[J].Journal of Chinese Mass Spectrometry Society,2016,37(1):84-87.
[2]
Holliday A E,Beauchemin D.Spatial profiling of analyte signal intensities in inductively coupled plasma mass spectrometry[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2004,59(3):291-311.
[3]
Lehn S A,Huang M,Warner K A,et al.Spatially resolved ground-state number densities of calcium and strontium ion in an inductively coupled plasma in contact with an inductively coupled plasma mass spectrometry sampling interface[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2003,58(9):1647-1662.
[4]
Lehn S A,Warner K A,Huang M,et al.Effect of sample matrix on the fundamental properties of the inductively coupled plasma[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2003,58(10):1785-1806.
[5]
Gamez G,Lehn S A,Huang M,et al.Effect of mass spectrometric sampling interface on the fundamental parameters of an inductively coupled plasma as a function of its operating conditions. Part I. Applied r.f. power and vacuum[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2007,62(4):357-369.
[6]
Gamez G,Lehn S A,Huang M,et al.Effect of mass spectrometric sampling interface on the fundamental parameters of an inductively coupled plasma as a function of its operating conditions.Part II. Central-gas flow rate and sampling depth[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2007,62(4),370-377.
[7]
Taylor N, Spencer R L,Farnsworth P B.The effect of matrix composition on radially resolved argon metastable atom populations in an emission ICP[J].Journal of Analytical Atomic Spectrometry,2012,27(7):857-867.
[8]
Mills A A,Macedone J H,Farnsworth P B.High resolution imaging of barium ions and atoms near the sampling cone of an inductively coupled plasma mass spectrometer[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2006,61(9):1039-1049.
[9]
马海斌,张运臣,王林同.电感耦合等离子体质谱仪截取锥离子传递效率的探讨[J].冶金分析,2017,37(9):11-16.MA Hai-bin,ZHANG Yun-chen,WANG Lin-tong.Discussion on ion transmission efficiency in skimmer cone of inductively coupled plasma mass spectrometer[J].Metallurgical Analysis,2017,37(9):11-16.
[10]
Macedone J H, Farnsworth P B.Changes in plasma composition during the expansion into the first vacuum stage of an inductively coupled plasma mass spectrometer[J].Spectrochimica Acta Part B:Atomic Spectroscopy, 2006,61(9):1031-1038.
[11]
Ogillvie C M, Farnsworth P B.Correlation spectroscopy as a probe of excitation and ionization mechanisms in the inductively coupled plasma[J].Spectrochimica Acta Part B:Atomic Spectroscopy,1992,47(12):1389-1401.
[12]
Farnsworth P B,Woolley A,Omenetto N,et al.Experimental studies of charge transfer reactions between argon and the third row metals calcium through copper in the inductively coupled plasma[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2000,54(14):2143-2155.
[13]
Chan C Y,Hieftje G M.Investigation of plasma-related matrix effects in inductively coupled plasma-atomic emission spectrometry caused by matrices with low second ionization potentials-identification of the secondary factor[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2006,61(6):642-659.
