- 作者: 許東明; 彭昤; 林瑞摓
- 作者服務機構: Contribution from the Department of Chemistry, National Taiwan University, Taipei, Taiwan 107
- 中文摘要: The interaction between diethylenetriaminepentaacetic acid (DTPA or H5Z) 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 297nm and the optimum pH 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 (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:
- 英文摘要: --
- 中文關鍵字: Spectrophotometry; thermodynamics; Ce(III)-, Th(IV)-DTPA.
- 英文關鍵字: Spectrophotometry; thermodynamics; Ce(III)-, Th(IV)-DTPA.