Speciation of vanadium by anion-exchange chromatography with inductively coupled plasma mass spectrometry and confirmation of vanadium complex formation using electrospray mass spectrometry
Date
2007
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Chen, Z.
Rahman, M.M.
Naidu, R.
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Journal of Analytical Atomic Spectrometry, 2007; 22(7):811-816
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Abstract
Inductively coupled plasma mass spectrometry (ICP-MS) and electrospray mass spectrometry (ESI-MS) were used as complementary techniques to identify vanadium-EDTA complex formation. ESI-MS enabled the identification of the 1:1 stoichiometry of [VO(EDTA)]<sup>2-</sup> and [VO<inf>2</inf>(EDTA)]<sup>3-</sup> and their MS spectra showed these vanadium complexes to be present in the solution. In addition, on-column complex formation of vanadium with ethylenediaminetetraacetic acid (EDTA), and the subsequent separation and detection of their complexes, was achieved by ion chromatography (IC) with ICP-MS. To avoid polyatomic ions such as <sup>35</sup>Cl<sup>16</sup>O <sup>+</sup> interfering in the detection of <sup>51</sup>V, anion-exchange chromatography was used to separate chloride from vanadium-EDTA complexes with an eluent containing 30 mM NH<inf>4</inf>H<inf>2</inf>PO<inf>4</inf> and 5 mM EDTA at pH 8.0 within 15 min. Linear plots were obtained in a concentration range of 2.0-500 μg L<sup>-1</sup> with detection limits from 0.5-1.0 μg L<sup>-1</sup>. Finally, the proposed method was used for the determination of vanadium species in contaminated water. © The Royal Society of Chemistry.
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