铟(Ⅲ)-N-邻羧基苯-基N′-(2-氨基乙基)草酰胺络合吸附波的研究与应用

Polarographic adsorptive wave of indium-N-o-carboxyphenyl-N′-(2-aminoethy l) acetamide complex and its application

在0.02mol L(CH2)6N4 HCl(pH3.57)介质中,In(Ⅲ)与N 邻羧基苯基 N′ (2 氨基乙基)草酰胺生成络合物,并吸附于电极表面,于-0.60V(vs.SCE)得到络合物吸附还原波。其2次微分极谱峰电流与In(Ⅲ)浓度在3.8×10-7～2.2×10-5mol L内呈良好的线性关系,检出限为3.6×10-8mol L。方法已应用于陶瓷颜料、矿石、人发中微量In(Ⅲ)的测定,并对电化学反应机理进行了初步探讨。

In a buffer solution of 0.1 mol/L (CH2)6N4-HCl(pH 3.57), the complex of indium-N-o-carboxyphenyl-N′-(2-aminoethyl)acetamide (OPAC) was adsorb ed on the surface of mercury electrodes and a reduction peak was found at -0.60 V(vs. SCE). The single-sweep 2nd-order derivative osillopolarographic peak current(ip″) showed a linear relationship with the concentration of In( Ⅲ) in the range of 3.8×10-7～2.2×10-5 mol/L with a detection limi t of 3.6×10-8 mol/L. The method was applied to the determination of trac e In in hair, dyestuff and ore samples with satisfactory results. The mechan ism of the eletrode reaction was also studied.