乙二胺四乙酸对锗(Ⅳ)-没食子酸体系及钒(Ⅳ)的示波极谱电流的影响  

Influence of Ethylenediamine Tetraacetic Acid on the Oscillopolarographic Current of Ge (Ⅳ)-Gallic Acid System and Vanadium (Ⅳ)

作　　者：张月霞[1] 吴永明[2] 

机构地区：[1]冶金部钢铁研究总院,北京100081 [2]北京科技大学理化测试中心

出　　处：《分析化学》1997年第3期326-329,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金会;中国科学院长春应用化学研究所电分析化学开放研究实验室资助

摘　　要：用分光光度法及电化学法详细研究了在稀硫酸介质（ｐＨ２），分别加ＥＤＴＡ（以 Ｈ３Ｙ形态存在）到锗（Ⅳ）－没食子酸（ＧＡ），Ｇｅ（Ⅳ）－ＧＡ－Ｖ（Ⅳ）体系以及单独Ｖ（Ⅳ）溶液中， 所产生的影响。结果表明，ＥＤＴＡ使 Ｇｅ（Ⅳ）－ＧＡ体系的两步２电子反应过程变得清晰；Ｇｅ （Ⅳ）－ＧＡ－Ｖ（Ⅳ）体系因Ｖ（Ⅳ）２Ｈ３Ｙ－的形成，增强了Ｖ（Ⅳ）的化学氧化力。且化学反应产物 Ｖ（Ⅲ）３Ｈ３Ｙ－在－０．７３Ｖ产生还原电流。这些都有利于加速该体系的催化循环，从而达到增 敏的作用。文中对体系的电流特性，电极反应过程的可逆性，电极反应机理等也进行了研究。On the basis of our previous work,the influence produced by adding EDTA(in the form of H3Y-) to the system of germanium (Ⅳ)-gallic acid(GA), Ge(Ⅳ)-GA-V(Ⅳ) and the solution of vanadium(Ⅳ) in the medium of dilute sulfuric acid(pH^2) was investi- gated in detail by spectrophotometry and electrochemistry respectively. The results indicated that EDTA could make the two-step electrode reaction of Ge(Ⅳ)-GA system to be distin- guishable. In the Ge(Ⅳ)-GA-V(Ⅳ)system, due to the formation of V(Ⅳ)2·H3Y-,the oxidizing power of V(Ⅳ) was strengthened, and the product of chemical reaction, V(Ⅲ)2· H3Y-, produced a reduction current at-0.73 V(vs. SCE). All of these were beneficial to accelerating the catalytic cycle of this system thereby an enhancement was achieved. The current character, the reversibility and the mechanism of electrode reaction etc. were also studied.

关 键 词：锗 没食子酸 示波极谱法 增敏机理 EDTA 钒 

分 类 号：O614.431[理学—无机化学]