Journal
ANALYTICA CHIMICA ACTA
Volume 583, Issue 2, Pages 296-302Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2006.10.033
Keywords
Zr; Hf; Nb; Ta and W; Seawater; TSK-8HQ; inductively coupled plasma-mass spectrometry
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Here, we present the first simultaneous preconcentration and determination of ultratrace (pmol kg(-1) level) Zr, Hf, Nb, Ta and W in seawater, both in the form of dissolved and acid-dissolvable species. 8-Hydroxyquinoline (8HQ) bonded covalently to a vinyl polymer resin, TSK-8HQ, was used in a chelating adsorbent column to concentrate the metals. The greatest advantage of this resin is its endurance to 5 M HF, since this is an effective eluent for all five metals. The analytes were successfully concentrated from 250 mL seawater with a 50-fold concentration factor through the column extraction and evaporation. The detection limit was 0.009-0.15 pmol kg(-1). The procedure blank determined using ultra pure water as a sample was 0.005-0.37 pmol kg(-1). The five metals were quantitatively recovered from seawater with good precision (2-4%). The effect of sample pH, sample flow rate, eluent composition and sample pretreatment were carefully studied. This method was applied to seawater. (c) 2006 Elsevier B.V. All rights reserved.
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