摘要
作者用pH电位滴定法测定了Cu、Ni、Zn、Co二价金属离子在37±0.2℃,离子强度为0.15mol/L(KNO_3)条件下,分别与α-氨基乙酸及DL-α-氨基异戊酸所形成的二元及三元络合物的稳定常数,并对三元络合物体系中各物种的组成进行了计算。
The stability constants of the Cu-Valine-Glycine system (1:1:1), Ni-Glycine-Valinesystem (1:1:1) , Zn-Glycine-Valine system(1:1:1), Co-Glycine-Valine system (1:1:1)and stability constants of binary complexeswere determined at Iu=0.15 mol/L (KNO_3)and t=37±0.2℃ by means of pH titrationmethod and the composition distribution ofthe ternary systems was calculated. The stability constants of binary andternary complexes were calculated byAdrien-Albert method and Liang Guoganga method respectively. The results showed that the ternarycomplexes were more stable than binarycomplexes. Either for the binary or forthe ternary eomplexes, the stability of thecomplexes decreased in sequence Cu(Ⅰ)Ni(Ⅰ)>Zn(Ⅰ)>Co(Ⅰ).
出处
《华西医科大学学报》
CAS
CSCD
1989年第2期157-157,共1页
Journal of West China University of Medical Sciences
关键词
微量元素
离子强度
络合物
氨基酸
Stability constant
Ionic strength
Complex Trace elements
