Comparison of no gas and He/H2 cell modes used for reduction of isobaric interferences in selenium speciation by ion chromatography with inductively coupled plasma mass spectrometry
Date
2008
Authors
Chen, Z.
Wang, W.
Mallavarapu, M.
Naidu, R.
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Spectrochimica Acta - Part B Atomic Spectroscopy, 2008; 63(1):69-75
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Inductively coupled plasma mass spectrometry (ICP-MS) used for the detection of most common selenium isotopes <sup>78</sup>Se (23.8%, abundance) and <sup>80</sup>Se (49.6%, abundance) is interfered in the presence of <sup>38</sup>Ar<sup>40</sup>Ar<sup>+</sup> and <sup>40</sup>Ar<sup>40</sup>Ar<sup>+</sup> in argon (Ar) gas. To address this issue, ICP-MS with an octopole reaction system (ORS) was explored for the detection of selenite and selenate, which was separated by anion-exchange chromatography. Results indicate that it was possible to detect <sup>78</sup>Se using no collusion gas, while to detect <sup>80</sup>Se a H<inf>2</inf> as the collusion/reaction gas was recommended since the background and noise were significantly reduced using H<inf>2</inf> as the gas. The selenium speciation interested was separated on a new column (G3154/101A, Agilent technologies) within 5 min using a mobile phase containing 10 mM NH<inf>4</inf>H<inf>2</inf>PO<inf>4</inf> and 20 mM NH<inf>4</inf>NO<inf>3</inf> at pH 6.5. Linear plots were obtained in a concentration range of 1-200 μg/L with detection limits less than of 0.4 μg/L for <sup>80</sup>Se (IV) and 0.6 μg/L for <sup>80</sup>Se (VI) using H<inf>2</inf> as the reaction gas. Finally, the proposed method was used in the determination of selenium in water and soil. © 2007 Elsevier B.V. All rights reserved.
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