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Simultaneous determination of Zr(IV) and Hf(IV) by CE using precolumn complexation with a [PW 11 O 39 ] 7− ligand
Author(s) -
Himeno Sadayuki,
Kitano Eri,
Chaen Norimitsu
Publication year - 2007
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200600633
Subject(s) - ternary operation , lacunary function , chemistry , analytical chemistry (journal) , ligand (biochemistry) , detection limit , ternary complex , ion , buffer solution , inorganic chemistry , nuclear chemistry , chromatography , biochemistry , enzyme , receptor , mathematics , computer science , pure mathematics , programming language , organic chemistry
Abstract A CE method was developed for the simultaneous determination of Zr(IV) and Hf(IV) at trace levels. A lacunary Keggin‐type [PW 11 O 39 ] 7− ligand reacted quantitatively with a mixture of trace amounts of Zr(IV) and Hf(IV) to form the so‐called ternary Keggin‐type anions [P(Zr IV W 11 )O 40 ] 5− and [P(Hf IV W 11 )O 40 ] 5− in 0.010 M monochloroacetate buffer (pH 2.2). Since both ternary anions possessed different electrophoretic mobilities and high molar absorptivities in the UV region, Zr(IV) and Hf(IV) were determined simultaneously with direct UV detection at 258 nm. Each peak height was linearly dependent on the concentration of Zr(IV) or Hf(IV) in the range of 5.0×10 −7 –1.0×10 −5 M; a detection limit of 2×10 −7 M was achieved. The utility of the proposed CE method was demonstrated for the simultaneous determination of Zr(IV) and Hf(IV) in natural water samples with satisfactory results.