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本文研究了镓邻苯二酚紫(PV)体系的极谱行为。在单扫示波极谱仪上,PV分别在硫酸(pH3.2)和0.3mol/L NH_4Cl底液(pH2.9)中还原,E_(?)=-0.55V(vs.SCE),加入Ga(Ⅲ)后此波峰电流降低,并在稍负电位上出现一新波,在前者底液中,Ep_2=-0.67V,ip_2与C_(Ga)在1.0×10~(-7)—1.2×10~(-6)mol/L成正比;在后者底液中,Ep_2=-0.74V,在1.0×10~(-6)—2.0×10~(-5)mol/L成正比。用等摩尔系列法确定络合物的组成比为1:2。用循环伏安法等试验手段研究该波的性质及其反应机理,认为是络合吸附波,是络合物中配位体的还原。
In this paper, the polarographic behavior of gallium catechin violet (PV) system was studied. On single sweep polarography, PV was reduced in sulfuric acid (pH3.2) and 0.3mol / L NH4Cl solution (pH2.9), respectively, E_ (?) = -0.55V (vs.SCE) After Ga (Ⅲ), the peak current decreased and a new wave appeared at a slightly negative potential. In the former solution, Ep_2 = -0.67V, ip_2 and C_ (Ga) were between 1.0 × 10 -7 -1.2 × 10 -6 mol / L. In the latter solution, Ep_2 = -0.74V was proportional to 1.0 × 10 -6 -6.0 × 10 -5 mol / L. The equimolar series method was used to determine the composition ratio of the complex to 1: 2. Cyclic voltammetry and other experimental means to study the nature of the wave and its reaction mechanism, that complex adsorption wave is the ligand complex reduction.