Spectral interferences from polyatomic barium ions in inductively coupled plasma mass spectrometry |
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Authors: | E. V. Smirnova I. N. Mysovskaya V. I. Lozhkin G. P. Sandimirova N. N. Pakhomova A. A. Smagunova |
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Affiliation: | (1) Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, 1a ul. Favorskogo, Irkutsk, 664033, Russia |
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Abstract: | For the Element2 (a relatively new high-sensitivity magnetic sector ICP MS), we have studied spectral interferences from barium arising as a result of polyatomic barium ions, which have a considerable effect on the intensity of lines for rare-earth isotopes. We have shown that the parameters characterizing the interferences (the ratios of the signals from oxygen-containing, chlorine-containing, and fluorine-containing BaX+ ions to the Ba+ signal, and the apparent rare-earth concentrations Capp j resulting when overlap from polyatomic Ba occurs) are higher for the Element2 than for a quadrupole instrument (PQ2+). However, it is possible to solve many spectral overlap problems when using the Element2 by using the medium-resolution (MR) or high-resolution (HR) modes. We have estimated the resolutions needed to completely separate the masses of the polyatomic barium ions and the rare-earth isotopes in the spectrum. For cases when it is impossible to use the high-resolution mode due to the ∼100-fold decrease in sensitivity, we recommend preliminary separation of Ba from the rare earths. In this work, we have used extraction chromatography to determine low rare-earth concentration levels in Lake Baikal water. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 6, pp. 813–818, November–December, 2006. |
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Keywords: | inductively coupled plasma mass spectrometry spectral interferences high resolution rare-earth elements natural environments |
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