示差脉冲极谱法确定镉(Ⅱ)-甘胺酸体系的配合物稳定常数

DETERMINATION OF STABILITY CONSTANTS OF COORDINATION COMPLEXES BETWEEN CADMIUM(Ⅱ) ION AND GLYCINE BY DIFFERENTIAL PULSE POLAROGRAPHY

张建民

朱路

石秋芝

摘要

在镉离子浓度为5.00×10-5-2.00×10-4mol·L-1、甘氨酸与镉离子浓度比为100-400条件下,应用示差脉冲极谱技术测定不同溶液pH值时镉(Ⅱ)-甘氨酸体系的极谱峰电位和峰电流,依据极谱峰电位随溶液pH和自由金属离子浓度的变化关系曲线,建立合适的金属配合物体系模型.通过求解体系的质量平衡方程及拟合试验配合物形成曲线,用计算机分析程序优化得到MHL、ML、ML2、ML3和ML2(OH)五种金属配合物的稳定常数(lgβ)分别为9.67±0.15,4.35±0.02,7.83±0.03,10.04±0.04和11.48±0.13.

标签示差脉冲极谱法

稳定常数

金属配合物

Differential pulse polarography

Stability constants

Metal coordination complexes

Abstract

The polarographic peak potential and peak current of coordination complexes formed between Cd(Ⅱ) and glycine at different pH values of the reaction system,having its Cd(Ⅱ) ion concentration maintained in the range of 5.00×10-5-2.00×10-4mol·L-1,and the ratio of concentrations of glycine to Cd(Ⅱ) ion kept in the range of 100 to 400,were measured by differential pulse polarography.Based on the relationship curve on the variation of peak potentials with the variations of pH of the reaction solution and of the concentration of Cd(Ⅱ)-ion (in thems of lg Cd),a rational model of the metal ion coordination complex was established.By using the optimum computer program,and by solving the mass equilibrium equation of the reaction system,and by fitting the formation curves of the metal coordination complexes tested,the stability constants (lg β) of the five species of coordination complexes.MHL,ML,ML2,ML3 and ML2(OH) were obtained giving values of 9.67±0.15,4.35±0.02,7.83±0.03,10.04±0.04 and 11.48±0.13 respectively.

中图分类号 O614.24

所属栏目试验与研究

基金项目教育部留学回国人员科研启动基金资助项目(2003)

收稿日期 2005/11/21

修改稿日期

网络出版日期

作者单位点击查看

备注张建民(1965-),男,郑州市人,教授,博士,研究方向为电化学和无机功能材料.

引用该论文: ZHANG Jian-min,ZHU Lu,SHI Qiu-zhi. DETERMINATION OF STABILITY CONSTANTS OF COORDINATION COMPLEXES BETWEEN CADMIUM(Ⅱ) ION AND GLYCINE BY DIFFERENTIAL PULSE POLAROGRAPHY[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2006, 42(10): 796～799
张建民,朱路,石秋芝. 示差脉冲极谱法确定镉(Ⅱ)-甘胺酸体系的配合物稳定常数[J]. 理化检验－化学分册, 2006, 42(10): 796～799

论文评价

共有人对该论文发表了看法，其中：

人认为该论文很差

人认为该论文较差

人认为该论文一般

人认为该论文较好

人认为该论文很好

分享论文

参考文献

【1】Martell A E,Hancock R D.Metal complexes in aqueous solutions[M].New York and London:Plenum Press,1996．

【2】高鸿,张祖训.极谱电流理论[M].北京:科学出版社,1986．

【3】张建民,鲍改玲.金属配合物体系极谱数据的计算机分析法[J].计算机与应用化学,2003,20(3):351-353．

【4】张建民,石秋芝.金属离子极谱峰电位的精确拟合解析[J].计算机与应用化学,2003,20(5):697-700．

【5】张建民,魏爱卿.金属离子Bi(Ⅲ)配合物体系的极谱法研究[J].化学物理学报,2004,17(14):465-470．

【6】张建民,王志武,石秋芝.联合处理电位法和极谱法得到的试验数据确定金属配合物稳定常数[J].无机化学学报,2004,20(3):324-330．

【7】张建民,鲍改玲,魏爱卿.示差脉冲极谱法测定铋-邻吡啶甲酸体系的配合物稳定常数[J].理化检验-化学分册,2004,40(9):514-516．

【8】Cukrowski I,Marsicano F,Hancock R D,et al.Complexation of Bi-Ⅲ by nitrogen donor ligands-a a polarographic study[J].Polyhedron,1995,14:1661-1707．

【9】Smith R M,Martell A E.Critical stability constants[M].New York:Plenum Press,1997．

【10】Cukeowska E,Cukroeski I.Proronation constant of monoaza-12-crown-4 ether and stability constants with selected metal ions in aqueous solution in the presence of an excess of sodium ion:a potentiometric and differential pulse polarographic study at fixed ligand to metal ratio and varied pH[J].Talanta,1998,47:1175-1189．·光盘优惠发行·

	标题	相关频次
	ATO透明导电薄膜的研究进展	1
	磁粉检测在电站锅炉定期检验中的应用	1
	湖州师范学院张玉建《德国应化》：颜色可调的有机防伪材料	1
	两种蒙药中锗的差示脉冲极谱测定及其红外光谱的差异	1
	生成函数法用于中性氨基酸-铜配合物稳定常数的测定	1
	双等色点光度法测定姜黄素-铁(Ⅱ)的稳定常数及试验方法改进	1
	微分脉冲极谱法测定草酸	1