铝-邻苯二酚紫络合吸附波的研究  

Study on Adsorptive Complex Wave of Aluminium-Pyrocatechol

作　　者：李启隆[1] 邢京娜 Li Qilong;Xing Jingna(Department of Chemistry,Beijing Normal University,Beijing)

机构地区：[1]北京师范大学化学系

出　　处：《高等学校化学学报》1986年第1期15-18,共4页Chemical Journal of Chinese Universities

摘　　要：邻苯二酚紫在NH_(4)Ac(pH4.7)底液中还原,产生良好的示波极谱图,Ep1=-0.66V(vs.SCE).加入A1^(3+)后,此波高降低,并在稍负的电位上出现一个尖峰形的新波(E_(P2)=-0.85 V),其峰电流与铝的浓度在1×10^(-6)-1.2×10^(-5)M范围成正比,此波可用于测定铝,实验表明,该波属于络合吸附波,用连续变化法确定络合物的络合比为1:1。In a supporting electrolyte containing 3.5·10^(-5)M pyrocatechol, 0.015 NH_(4)Ac and at pH 4.7, an adsorptive complex wave of aluminium-pyrocatechol was obtained by single-sweep polarography. The peak potential of the polarographic wave was -0.85V (vs, SCE). The linear relationship between wave height and concentration of Al^(+3) held in the range of 1 ·10^(-6)- 1. 2·10^(-5)M.The composition of the complex in the ratio 1:1 was determined. This wave was proved to be an adsorptive wave by several experiments. The mechanism of the electrode reaction was discussed.

关 键 词：邻苯二酚紫 络合吸附波 连续变化法 络合比 峰电流 络合物 

分 类 号：O65[理学—分析化学]