Simultaneous capillary electrophoretic determination of Sb(III) and Bi(III) based on the complex-formation with a W(VI)-P(V) reagent |
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Authors: | Himeno Sadayuki Kitazumi Iwao Takamoto Masayo Nakashima Yoichi |
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Institution: | a Department of Chemistry, Faculty of Science, Kobe University, Nada, Kobe 657-8501, Japan b Technology Research Institute of Osaka Prefecture, Izumi, Osaka 594-1157, Japan |
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Abstract: | A capillary electrophoretic method was developed for the simultaneous determination of Sb(III) and Bi(III). A 1.0 mM W(VI)-0.10 mM P(V) complexing reagent readily reacted with a mixture of trace amounts of Sb(III) and Bi(III) to form the corresponding ternary Keggin-type complexes; P(SbIIIW11)O40]6− and P(BiIIIW11)O40]6− in 0.01 M malonate buffer (pH 2.4). Since the peaks due to the migrations of the ternary complex anions were well separated in the electropherogram, the pre-column complex-formation reaction was applied to the simultaneous CE determination of Sb(III) and Bi(III) with direct UV detection at 255 nm. The calibration curves were linear in the range of 2×10−7-5×10−5 M; a detection limit of 1×10−7 M was achieved for Sb(III) or Bi(III) (the signal-to-noise ratio=3). |
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Keywords: | Capillary electrophoresis Simultaneous determination of Sb(III) and Bi(III) A lacunary [PW11O39]7&minus complex Polyoxometalate |
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