电位溶出分析法和流动注射_电位溶出分析法测定Re_EDTA配合物稳定常数

电位溶出分析法（Ｐ．Ｓ．Ａ）可间接测定配合物稳定常数，本文根据这一方法原理，首次采用双通道ＦＩＡ传递系统以及自制的静止电极壁喷式（ｗａｌｌ－ｊｅｔ）流通池，分别用流动注射－电位溶出分析法（ＦＩＰＳＡ）和Ｐ．Ｓ．Ａ法测定了５种Ｒｅ－ＥＤＴＡ配合物稳定常数，并导出了一组ＦＩＰＳＡ法间接测定配合物稳定常数的公式。结果表明，间接Ｐ．Ｓ．Ａ法测定配合物稳定常数的方法适宜于稀土配合物的研究，而对于ＦＩＰＳＡ法，由于快速流体条件下，置换配合反应的不完全性及可精确控制其反应程度，使其能测定Ｋ＿（ＭＩｙ）与Ｋ＿（ＭＩｙ）相近的Ｋ＿（ＭＩｙ），优于Ｐ．Ｓ．Ａ法。

DETERMINATION OF THE CONDITION STABILITY CONSTANT FOR RE-EDTA BY POTENTIOMETRIC STRIPPING ANALYSIS AND INJECTION POTENTIOMETRIC STRIPPING ANALYSIS

The condition stability constant for Re-EDTA is determined from the replacement reaction withlead-EDTA compound by poteniometric stripping analysis with wall-jet detector respectively.The Formulas for determination of the condition stability constant byF.I.P.S.A. are deducedfor the first time. The observed values are in agreement with those from handboobs.The workshows that the method of determination of condition stability constant by P.S.A. and F.I.P,S.A. is appplicable to the complex compounds of rare-earth metals.This provides a new methodfor research On rare-earth metals and provides a new applied domain for F.I.P.S.A. Because ofthe incomplete exchange reaction under the fluid condition,the K_(MIL) which is approximate to theK_(MIL) can be determined by F.I.P.S.A.,which is superior to the P.S.A.On the other hand,thismethod is more applicable to research on complex compounde of rare-earth metals due to its ad-vantage of quickness,convenience and the small amount of sample used.