Premium
Spectrophotometric Studies of Cerium(III) and Thorium(IV) Chelates of Diethylenetriaminepentaacetic Acid (DTPA)
Author(s) -
Hseu TongMing,
Peng Ling,
Lin ZuiFeng
Publication year - 1983
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198300024
Subject(s) - chemistry , chelation , diethylenetriaminepentaacetic acid , cerium , ionic strength , aqueous solution , thorium , inorganic chemistry , absorption (acoustics) , ion , nuclear chemistry , organic chemistry , uranium , metallurgy , materials science , physics , acoustics
The interaction between diethylenetriaminepentaacetic acid (DTPA or H s Z) and Ce(III) and Th(IV) ions has been investigated spectrophotometrically in aqueous solution at an ionic strength of 0.1 and for various temperatures. It has been found that the Ce(III)‐DTPA chelate (1:1) exhibited a characteristic absorption maximum at 297 nm , and the optimum p H range is between 3.4 to 4.4. The absorption of Ce(III)‐DTPA chelate is considerably diminished by adding small amounts of Th(IV) ions. This phenomenon was used to evaluate the formation constant of Th(IV)‐DTPA chelate (1:1). The formation constants and the thermodynamic properties characterizing the formation of the chelates have been calculated at 25°. The results are as follows: