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本文提出一种十分快速简便的两相pH滴定法,研究HDEHP萃取Cu~(++)、Co~(++)、Ni~(++)机理。此法在两相平衡时,只要测定水相的pH,通过预先假定的有机相萃合物的形式及种类,确定数学计算式,用实验数据验算萃合常数,来证实设想的反应机理的合理性。它比常用的研究络合物的溶剂萃取法省略了测定两相金属离子浓度这一步骤,但也带来了本法的局限性。本文提出在金属离子Cu~(++)、Co~(++)、Ni~(++)不发生水解、聚合、有机相只存在一种萃合物MA_2·2HA情况下,研究萃取机理的数学假定及实验方法。实验确定HDEHP萃取Cu~(++)、Co~(++)、Ni~(++)时,萃合常数1gβ_(Gu)=11.58;1gβ_c。=10.63:1gβ_(Ni)=8.97。
This paper presents a very fast and simple two-phase pH titration method for the study of HDEHP extraction Cu ~ (++), Co ~ (++), Ni ~ (++) mechanism. This method in the two-phase equilibrium, as long as the determination of the pH of the aqueous phase, presupposed by the type and type of organic phase extract to determine the mathematical formula, with experimental data to verify extraction constant to confirm the reasonable reaction mechanism Sex. This method omits the step of determining the concentration of the two-phase metal ion than the commonly used solvent extraction of the complex studied, but it also brings with it the limitations of this method. In this paper, we proposed the extraction mechanism of Cu 2+, Co 2+ and Ni 2+ in the organic phase without any hydrolysis and polymerization. Mathematical Assumptions and Experimental Methods. The extraction constant of 1gβ_ (Gu) = 11.58 and 1gβ_c were determined when HDEHP was extracted Cu ~ (++), Co ~ (++), Ni ~ (++) = 10.63: 1gβ_ (Ni) = 8.97.