DERIVATIVES OF IMIDOPYROPHOSPHORIC ACIDS AS EXTRACTANTS .5. THE DETERMINATION OF THE FUNDAMENTAL CONSTANTS OF N,N-N',N'-OCTAALKYLIMIDODIPHOSPHOTETRAMIDES BY POTENTIOMETRY

被引：2

作者：

JARVIS, NV ^{[1
]}

KRUGER, L ^{[1
]}

DUPREEZ, JGH ^{[1
]}

机构：

[1] UNIV PORT ELIZABETH,URANIUM CHEM RES UNIT,PORT ELIZABETH 6000,SOUTH AFRICA

来源：

SOLVENT EXTRACTION AND ION EXCHANGE | 1993年 / 11卷 / 05期

关键词：

D O I：

10.1080/07366299308918188

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The interaction of nitric acid in two-phase systems in the pH range with the extractant, N,N-N',N'-octabutylimidodiphosphotetramide (OBIPA) in toluene has been investigated using two-phase potentiometric titrations. The data thus obtained were analysed by the ESTA library of programs which was designed for modelling solution equilibria in aqueous phases. The use of such a program in the analysis of two-phase potentiometric data is novel, and the feasibility and corrections needed to be applied are discussed. Gratifying results were obtained indicating that a program such as ESTA may indeed be used for two-phase systems. The extraction equilibrium constant for the formation of the (2HA.HNO3)O species was found to be 7.54 x 10(4). Constants could also be calculated for the dimerisation and the partition of the extractant between the two-phases. These were found to be 18.5 M-1 and 1.92 x 10(2) respectively. A water soluble, methyl analogue of OBIPA was used to calculate the acid dissociation constant (pk(a)) which was found to be 9.043.

引用

页码：811 / 830

页数：20

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