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Polarographic Study on Metal Ion Bi(Ⅲ) Complex System
Zhang Jianmin*,Wei Aiqing
Author NameAffiliationE-mail
Zhang Jianmin* Department of ChemistryZhengzhou UniversityZhengzhou 450052 zhjm@zzu.edu.cn 
Wei Aiqing Department of ChemistryZhengzhou UniversityZhengzhou 450052  
Abstract:
The B(i Ⅲ)-Ligand(pyridine-2-carboxylic acid)system was studied by the differential pulse polarography(DPP)at the fixed total-ligand to total-metal concentration ratio[LT]:[MT]and varied pH. An appropriate model for the metal complex system is designed according to polarographic peak parameters,that is,the observed shift in the peak potential and the change in the peak current with pH changes in the sample solution. The polarographic experimental complex formation curve(ECFC)and theoretical complex formation curve(TCFC)were used for checking the designed metal complex model as well as optimizing stability constants. The ECFC,in which experimental parameters(a shift in a peak potential and a variation in a peak current)are included,appears to be a characteristic function for a particular metal-ligand system. The TCFC is a theoretical curve calculated from massbalance equations for the designed metal-ligand model. Using the computer analytical program,stability constants of metal complexes and species distribution diagrams are obtained by solving the mass-balance equations written for the metal complex system and fitting the complex formation curve. Five bismuth complexes MHL,ML,ML2,ML3,ML3 ( OH),and their stability constants as logβ 7.52±0.15,7.48±0.06,13.94±0.02,18.12±0.03 and 26.78±0.03,respectively,are finally reported while the TCFC fits best the ECFC.
Key words:  Metal complex system,Stability constant,Computer analytical program,Bismuth
FundProject:
金属离子Bi(Ⅲ)络合物体系的极谱法研究
张建民*,魏爱卿
摘要:
在络合剂与金属离子浓度比固定条件下,改变溶液的pH值,用示差脉冲极谱技术研究金属离子Bi(Ⅲ)-邻吡啶甲酸络合物体系.根据实验得到的极谱峰电流和峰电位随溶液pH的变化,设计合适的金属络合物体系模型.极谱实验络合物形成曲线(ECFC)和理论络合物形成曲线(TCFC)被用来检验金属络合物体系模型和优化络合物稳定常数.含有极谱实验参数(峰电位的移动和峰电流的变化)的实验络合物形成曲线是特定金属络合物体系的特征函数.理论络合物形成曲线的计算是基于金属络合物体系的质量平衡方程.通过求解体系的质量平衡方程及拟合实验络
关键词:  金属络合物体系  稳定常数  计算机分析程序  
DOI:10.1088/1674-0068/17/4/465-470
分类号: