Effect of microstructure of graphite on the nonreductive thermal ion emission in thermal ionization mass spectrometry

The Journal of Physical Chemistry. a
H Z WeiY K Xiao

Abstract

The emission behavior of polyatomic ions in the ionization source of thermal ionization mass spectrometry (TIMS) was investigated. The results suggest that the presence of a graphite promoter plays a key role for the formation and stable emission of polyatomic ions, such as M(2)X(+), M(2)BO(2)(+), Cs(2)NO(2)(+), and Cs(2)CNO(+). Our data further implied that the intensity of M(2)X(+) and M(2)BO(2)(+) increases and the emission temperature decreases with increasing cationic and anionic radius. During the boron isotopic measurement using the Cs(2)BO(2)(+)-graphite-PTIMS method, the isobaric interference ion Cs(2)CNO(+) cannot be transformed from nitrate or organic compounds containing an amide group but can be induced by the existence of trace amounts of boron because of its special electron-deficiency property (B(3+)). Characterization on the planar crystalline structure of various graphite samples with SEM, TEM, and Raman spectroscopy confirmed the relationship of the emission capacity of polyatomic ions and the crystal microstructure of graphite and provides direct evidence that graphite with a perfect parallel and equidistant layer orientation shows a beneficial effect on the emission of polyatomic ions in TIMS. The mechanism...Continue Reading

References

Jan 19, 2002·Fresenius' Journal of Analytical Chemistry·Y K XiaoH Lu
Jul 13, 2006·Environmental Science & Technology·Henry HolmstrandOrjan Gustafsson
Jun 19, 2008·Chemical Reviews·Richard L McCreery
Jun 20, 2008·Chemosphere·Kurt WinkelmannRia A Yngard

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