Abstract − Analytical Sciences, 15(1), 35 (1999).
Formation of a Keggin-Type 12-Molybdogallate(III) Complex in Aqueous-Organic Media and the Application to the Voltammetric Determination of Gallium(III)
Sadayuki HIMENO, Iwao KITAZUMI and Ken-ichi SANO
Department of Chemistry, Faculty of Science, Kobe University, Nada, Kobe 657-8501, Japan
A simple method has been developed for the voltammetric determination of Ga(III). In a 50 mM Mo(VI)-0.2 M HCl-40%(v/v) CH3CN system, Ga(III) reacts directly with Mo(VI) to form a 12-molybdogallate(III) complex. The yel-low Keggin complex undergoes a two-step reduction to the mixed-valence heteropoly-blue species at the glassy carbon (GC) electrode. The 1st voltammetric reduction current depends linearly on the Ga(III) concentration in the range of 5¥10 -5 - 1¥10 -3 M. Common metal ions including Al(III) and In(III) at 100-fold concentrations caused no interference. The effect of organic solvents on the formation of the Keggin complexes prepared so far is also discussed. (Keywords: 12-Molybdogallate(III), voltammetric determination, gallium(III))
J-STAGE:
View this article in J-STAGE
Back to the Table of Contents
