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本文研究了钍与二甲苯酚橙形成络合物的条件、组成和稳定性.pH对钍(Ⅳ)与二甲苯酚橙络合物的生成影响甚大,在pH为2～3.5时形成玫瑰色的络合物,其光吸收高峰为560mμ,在此波长下克分子消光系数为2.94×10~4.钍(Ⅳ)与二甲苯酚橙络合物在盐酸——醋酸钠缓冲溶液中不稳定,但在硝酸介质中却很稳定,虽经两天,其光密度仍然不变.应用斜率法和等克分子浓度递变法,在560mμ下测定其光密度,测定结果证实钍(Ⅳ)与二甲苯酚橙的组成比应为1∶1.测定了钍(Ⅳ)与二甲苯酩橙络合物的稳定常数应为1.04×1O~6,其生成吉氏函数△z~0应为-8.50千卡.
In this paper, the conditions, composition and stability of complex formed between thorium and xylenol orange were studied.The effect of pH on the formation of thorium (Ⅳ) and xylenol orange complex was very great, and rose at pH 2 ~ 3.5 Of the complex, the peak of its light absorption 560mμ, at this wavelength molecular extinction coefficient of 2.94 × 10 ~ 4. Thorium (Ⅳ) and xylenol orange complex in hydrochloric acid - sodium acetate buffer solution is not stable , But it was stable in nitric acid medium, its optical density remained unchanged after two days.The optical density was measured at 560mμ using the slope method and the method of isometric molecular concentration, and the results confirmed that thorium (Ⅳ) and bis The composition ratio of cresol orange should be 1: 1. The stability constant of the complex of thorium (Ⅳ) and xylene 酩 orange should be determined to be 1.04 × 10-6, and the formation of the Kyrgyz function △ z ~ 0 should be -8.50 Kcal.