Formation Equilibria of Ternary Metal Complexes with Citric Acid and Glutamine (Alanine) in Aqueous Solution

作     者：王进平 牛春吉 杨魁跃 倪嘉缵 

作者机构：Key Laboratory of Rare Earth Chemistry and Physics 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2004年第22卷第1期

页      面：183-186页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina(29971029)andKeyLaboratoryofRareEarthChemistryandPhysics ChangchunInstituteofAppliedChemistry ChineseAcademyofSciences 

主　　题：physiology calcium zinc speciation potentiometric titration rare earths 

摘      要：The species and their formation constants in the ternary systems were obtained by the Scogs2 software from potentiometric titration data. The Comics software was used to calculate the distribution of species in the ternary systems. MLXH, MLXH 2 and MLXH 3 are the common species in these systems. The coordination behaviors of the rare earths are very similar and their stability is closely matched. The ternary rare earth complexes are more stable than the corresponding ternary complexes of calcium. The ternary zinc complex with glutamine as the secondary ligand is more stable than the corresponding complexes of rare earths, but the ternary complex with alanine as the secondary ligand shows an inverse trend. The distributions of species in the ternary systems vary with pH changing. A prediction can be made that exogenous rare earths can affect the species of Ca and Zn in human body.