钍(IV)-EDTA-氨基酸三元体系混合配合物研究

Research on Complex Compound of Thorium (IV)-EDTA-Amino Acid System

用pH电位法研究Th(NO3)4和乙二胺四乙酸二钠盐分别与d 缬氨酸、dl 异亮氨酸、dl 蛋氨酸、l 谷氨酰胺、l 脯氨酸在水溶液中的配合反应.证明在pH=5～6时,有1∶1∶1的ThYL(L 氨基酸根,Y 乙二胺四乙酸根)混合配合物生成,在(30±0 1)℃,离子强度μ(KNO3)=0 15的条件下,测定了相应配合物的稳定常数lgKThYThYL.除[ThY(l Pro)]-外,其余lgKThYThYL与pKHL呈lgKThYThYL=1 40pKHL-8 30线性关系.

The complex reactions of Th(NO3)4 and complexon III with dvaline, dlisoleucine, dlmethionine, lamide glutamate and lproline in water solution have been respectively investigated using the pH potential method. It is demonstrated that the complex compound of ThYL (Lroot of amino acid, Yroot of EDTA)with the ratio of 1∶1∶1 is formed when pH=5～6.The stability constant lgKThYThYL has been measured under the conditions of 30±01 ℃ and ionic strength μ(KNO3)=015. There exists the following linear relationship between lgKThYThYL and pKHL: lgKThYThYL =140 pKHL-830, except-.