Studies on Voltammetric Adsorptive Wave of Gallium-Salicyl Fluorone Complex

Abstract

Abstract: In a supporting solution containing 5.0× 10⁶ mol/Lsalicyl fluorone, 0.2 mol/Lpotassium hydrogen phthalate- HCl, at pH=3.0, a sensitive adsorptive wave of gallium- salicyl fluorone complex was obtained by using linear scanning voltammetry.The peak potential is - 0.93 V(vs, SCE).The change of peak height with the concentration of gallium is linear in the range of 7.5× 10^-9～3.8× 10^-7 mol/L.The electrode processes of the adsorptive wave of the complex may be presented as follows: 1.Complexing reaction in the bulk solution is Ga(Ⅲ)+H₄L=GaH₃L²⁺+H⁺ 2.GaH₃L²⁺ diffuses to the electrode surface and is adsorbed on it GaH₃L²⁺=GaH₃L_nds²⁺3.When Ep₍₂₎=-0.93 V, the ligand and the center ion of the complex are simultaneously reduced GaH₃L²⁺=GaH₃L_nds²⁺+5e+3H⁺→Ga(Hg)+H₄L_ads

Key words: Voltammetry, Adsorptive wave of complex, Trace analysis, Gallium

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Chen Rongli, Zhang Xiaoli, Wang Lizeng, Wang Shuren . Studies on Voltammetric Adsorptive Wave of Gallium-Salicyl Fluorone Complex[J]. Chem. J. Chinese Universities, 1989, 10(12): 1180.

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Studies on Voltammetric Adsorptive Wave of Gallium-Salicyl Fluorone Complex

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