摘要
在ｐＨ４．５的ＨＡｃ－ＮａＡｃ介质中，Ｎｉ（Ⅱ）与１－苯基－３－甲基－４－苯甲酰基－吡唑啉酮－５（ＰＭＢＰ）生成络合物，于－０．９５Ｖ（ｖｓ．ＳＣＥ，下同）出现一尖锐、灵敏的极谱波峰电流与Ｎｉ（Ⅱ）浓度在０．００５～１．２μｇ／ｍｌ范围内呈良好的线性关系．用多种电化学方法研究了极谱波的性质及电极反应机理，证明－０．９５Ｖ处的极谱波为络合物吸附波，峰电流由中心离子Ｎｉ（Ⅱ）还原产生，络合物组成为Ｎｉ（Ⅱ）：ＰＭＢＰ＝１：１试验了多种离子对峰电流的影响采用离子交换法分离干扰离子，用于钢样中镍的测定，得到满意结果。
In the medium of HAc-NaAc(pH4.5),Ni(Ⅱ) reacts with 1-pheny1-3-methy1-4-benzoy1-5pyrazalone(PMBP)to form a complex and there is a sharp and sensitive polarographic wave on aDME(dropping mercury electrode) at -0.95V(vs.SCE). The peak height is linear with the concentrationof Ni(Ⅱ) in the range of 0.005-- 1.2 g/ml. Several electrochemical methods are used to study theproperties of the polarographic wave and the mechanism of electrode reaction and it is proved that thepolarographic wave at -0.95V is an adsorptive wave of the complex. The peak current is produced byreduction of central ion Ni.The composition of the complex is Ni: PMBP=1: 1.Effects ofinterference ions are tested. The interfering components are separated by ion exchange method.Themethod is applied to the determination of nickel in steel with satisfactory results.
出处
《四川轻化工学院学报》
1999年第4期41-44,共4页
Journal of Sichuan Institute of Light Industry and Chemical Technology
关键词
络合物
吸附波
镍
极谱波
PMBP
电化学
adsorptive wave of complex: nickel: 1-phenyl-3-methy1-4-denzoy1-5-pyrazalone
steel
