摘要
铟(Ⅲ)在0.03mol/l邻苯二甲酸氢钾(KHP)、5×10^(-6)mol/l二甲酚橙(XO)溶液(pH3.9)中,出现一良好的示波极谱图,峰电位E_p=-0.68V(vs.SCE),其峰电流与铟的浓度在1.0×10^(-7)～3.0×10^(-6)mol/l范围内成线性关系,检测下限为5.0×10^(-8)mol/l。用等摩尔连续变化法确定络合物的络合比为In(Ⅲ):XO=1:1。用循环伏安法等电化学手段研究极谱波的性质及其反应机理。并测定了不同铟浓度时体系的吸附量。体系的吸附符合Frumkin吸附等温式,吸附系数β=4.3×10~5,吸引因数α=-1.75。实验表明,该波属于络合吸附波。
In a supporting electrolyte containing 0.03 mol/L potassium hydrogen phthalate, 5.10^(-6)mol/L XO, at pH 3.9, a sensitive adsorptive complex wave of indium-XO has been obtained byusing linear sweep voltammetry. The peak potential is -0.68V (vs. SCE). The change of peakheight with indium concentration is linear in the range from 1.0×10^(-7) to 3.0×10^(-6)mol/L. Inthe solution, the composition of the complex has been found to be 1: 1. On the surface of DME,the adsorption of the system obeys Frumkin adsorption isotherm. The adsorption coefficient βis 4.3×10~5, the attractive factor α is -1.75.
基金
国家自然科学基金
关键词
铟
二甲酚橙
络合物
络合吸附波
Indium
xylenol orange
adsorptive complex wave
