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用多种电化学方法研究了Cd(Ⅱ)与1-苯基-3-甲基-4-(a-呋喃甲酰基)-5-吡唑啉酮(HPMαFP)配位吸附波的性质及反应机理。考察了支持电解质、体系pH、配体用量、扫描的起始电位、扫描速度等对电极反应的影响。实验结果表明,在HAc-NaAc(pH=4.8)的介质中,于-0.67V(vs.SCE)处出现一尖锐、灵敏的极谱峰,此极谱波被证明为配合物的吸附波。Cd(Ⅱ)含量在0.2~12μg.mL-1与峰电流呈线性关系,峰电流由中心离子Cd(Ⅱ)还原产生。配合物的组成为Cd2+:HPMαFP=1∶1。
A series of electrochemical methods were used to study the properties and reactions of the adsorption complex between Cd (Ⅱ) and 1-phenyl-3-methyl-4- (a-furoyl) -5-pyrazolone (HPMαFP) mechanism. The effects of supporting electrolyte, system pH, ligand dosage, initial scanning potential and scanning speed on the electrode reaction were investigated. The experimental results show that there is a sharp and sensitive polarographic peak at -0.67 V (vs.SCE) in the medium of HAc-NaAc (pH = 4.8), which is proved to be the adsorption wave of the complex. The content of Cd (Ⅱ) is linear with the peak current at 0.2 ~ 12μg.mL-1, and the peak current is reduced by the central ion Cd (Ⅱ). The composition of the complex was Cd2 +: HPMαFP = 1: 1.