铅-试铁灵络合物吸附波及溴化十六烷基三甲基铵增敏效应的研究  

Study on Adsorptive Wave of Lead(Ⅱ)_Ferron Complex and Sensitization Effect of CTMAB

作　　者：张淑云[1] 何平[1] 王宝萍[1] 刘永强 王曙[1] 

机构地区：[1]四川轻化工学院化工系

出　　处：《岩矿测试》1997年第4期313-315,共3页Rock and Mineral Analysis

基　　金：四川省教委科研基金

摘　　要：在０３０ｍｏｌ／ＬＨＡｃ介质中，Ｐｂ（Ⅱ）与７＿碘＿８＿羟基喹啉＿５＿磺酸（试铁灵，Ｆｅｒｏｎ）的络合物于－０５４Ｖ（ｖｓ．ＳＣＥ）产生一尖锐的极谱波，加入溴化十六烷基三甲基铵（ＣＴＭＡＢ）显著增敏，可使极谱波增高约４倍。峰电流与Ｐｂ（Ⅱ）浓度在９６×１０－９～４８×１０－６ｍｏｌ／Ｌ呈良好的线性关系，检出限为４８×１０－９ｍｏｌ／Ｌ。用多种电化学方法研究了该极谱波的性质及电极反应机理表明，络合物组成比为ｎＰｂ（Ⅱ）∶ｎＦｅｒｏｎ＝１∶１，极谱波为吸附波，峰电流由中心离子Ｐｂ（Ⅱ）还原产生，电子转移数为２。试验了多种离子对峰电流的影响，拟定的方法用于矿样分析，结果与原结果相符。In the medium of 0.30 mol/L HAc, Pb(Ⅱ) reacts with 7_iodo_8_hydroxy_quinoline_5_sulfonic acid (Ferron) to form a complex which has a sharp polarographic wave at -0.54 V( vs. SCE). In this system CTMAB increases sensitivity of Pb by a factor of 4. The peak height is linear with concentration of Pb(Ⅱ) in the range of 9.6×10 -9 ～4.8×10 -6 mol/L. The detection limit for Pb(Ⅱ) is 4.8×10 -9 mol/L. Several electrochemical methods have been used to study the properties of the polarographic wave and the mechanism of electrode reaction. It was proved that polarographic wave is a adsorptive one, the molar ratio of Pb(Ⅱ) to Ferron in the complex is 1∶1, the peak current is produced by the reduction of central ion Pb(Ⅱ), and the number of electron transferred is 2. The method has been successfully applied to the determination of Pb in ores.

关 键 词：铅 络合物吸附波 溴化十六烷基 三甲基铵 

分 类 号：O614.433[理学—无机化学]