Publications by authors named "Iwao Kitazumi"

2 Publications

  • Page 1 of 1

Simultaneous capillary electrophoretic determination of Sb(III) and Bi(III) based on the complex-formation with a W(VI)-P(V) reagent.

Talanta 2003 Dec;61(5):591-6

Department of Chemistry, Faculty of Science, Kobe University, Nada, Kobe 657-8501, Japan.

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(Sb(III)W(11))O(40)](6-) and [P(Bi(III)W(11))O(40)](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 2x10(-7)-5x10(-5) M; a detection limit of 1x10(-7) M was achieved for Sb(III) or Bi(III) (the signal-to-noise ratio=3).
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http://dx.doi.org/10.1016/S0039-9140(03)00366-7DOI Listing
December 2003

Capillary electrophoretic determination of Ga(III) based on the formation of a heteropolyoxomolybdate complex.

J Chromatogr A 2003 Apr;993(1-2):211-5

Department of Chemistry, Faculty of Science, Kobe University, Nada, Kobe 657-8501, Japan.

A novel capillary electrophoretic (CE) method was developed for the determination of Ga(III). The so-called Anderson-type [GaMo6O24H6]3- complex was readily formed by the reaction of Mo(VI) with Ga(III) in 0.050 M monochloroacetate buffer (pH 2.0) and the precolumn complex-formation reaction was applied to the CE determination of Ga(III) with direct UV detection at 240 nm. The peak area was linearly dependent on the concentration of Ga(III) in the range of 5.0 x 10(-7)-5.0 x 10(-5) M. Owing to the high molar absorptivity of the Anderson anion, a detection limit of 2.0 x 10(-7) M (signal-to-noise ratio=3) was achieved. The advantage of the present method is that the presence of large excesses of Al(III) and In(III) does not cause interference.
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http://dx.doi.org/10.1016/s0021-9673(03)00383-2DOI Listing
April 2003