Simultaneous Multielement Determination of Hydride- and Oxoanion-Forming Elements in Seawater by Inductively Coupled Plasma Mass Spectrometry after Lanthanum Coprecipitation.

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  • Yabutani Tomoki
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University
  • Ji Shan
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University
  • Mouri Fumihiko
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University
  • Itoh Akihide
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University
  • Chiba Koichi
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University
  • Haraguchi Hiroki
    Department of Applied Chemistry, Graduate School of Engineering, Nagoya University

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The simultaneous multielement determination of trace elements in seawater, especially hydride- and oxoanion-forming elements, has been investigated by inductively coupled plasma mass spectrometry with the aid of lanthanum coprecipitation preconcentration. The optimum pH in lanthanum coprecipitation was pH 9.5; at this value, trace elements were well recovered and major constituents of seawater such as Na, Mg, K, and Ca were significantly reduced in the concentrated solutions. The recovery values obtained for V, Cr(III), Mn, As(III), As(V), Se(IV), Y, Sn, Sb(III), Sb(V), W, Bi, and U were more than 85% after lanthanum coprecipitation, while Cr(VI), Se(VI), and Mo(VI) provided poor recoveries of less than 30%. The reproducibility for coprecipitation was within 5% as relative standard deviation. The present method was applied to the determination of trace elements in coastal seawater reference material CASS-3. The analytical values for Mn, As, V, Y, Sb, W, and U were in fairly good agreement with the certified or literature values.

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