论文部分内容阅读
本文采用电位滴定法和紫外光谱等摩尔浓度连续变换法研究了钍(Ⅳ)-羟基吡啶酮:1-羟基-2-吡啶酮(1,2-HOPO)和3-羟基-2-吡啶酮(3,2-HOPO)体系的溶液平衡规律。研究结果表明,钍(Ⅳ)与羟基吡啶酮强烈络合,并在不同的羟基吡啶酮与钍(Ⅳ)浓度比例和pH值范围内,生成不同的配合物,即pH=3.4,Th(1,2-OPO)~(3+);pH=4.0,Th(1,2-0P0)_2~(2+);pH=4.7,Th(1,2-OPO)_2~+;pH=5.8,Th(1,2-OPO)_4。3,2-HOPO与钍(Ⅳ)也存在类似的平衡状态,只是在略高的pH条件下生成上述各类的配合物。 用非线性最小二乘法BETA程序在CDC,CYBER170/825计算机上处理电位滴定数据,得到各配合物的生成常数和两种体系的pM值。
In this paper, potentiometric titration and UV spectrophotometric determination of thorium (Ⅳ) -hydroxypyridone: 1-hydroxy-2-pyridone (1,2-HOPO) and 3-hydroxy- 3,2-HOPO) system solution equilibrium. The results showed that thorium (Ⅳ) complexed strongly with hydroxypyridone, and different complexes were formed at different concentration ratios of pyrrole and thorium (Ⅳ) and pH value, ie, pH = 3.4, Th (2-OPO) _2 ~ +; pH = 4.0, Th (1,2-0P0) _2 ~ (2 + Th (1,2-OPO) _4.3,2-HOPO and thorium (Ⅳ) also exist a similar equilibrium, but at slightly higher pH to generate the above-mentioned various types of complexes. Potentiometric titration data were processed on a CDC, CYBER170 / 825 computer using a non-linear least squares BETA program to generate the constants for each complex and the pM values for both systems.