高等学校化学学报 ›› 1981, Vol. 2 ›› Issue (3): 275.

• 论文 • 上一篇    下一篇

两相pH滴定法对二-(2-乙基己基)磷酸萃取Cu++、Co++、Ni++机理的研究

王文清, 牟西茹   

  1. 北京大学技术物理系
  • 收稿日期:1980-08-20 出版日期:1981-08-24 发布日期:1981-08-24

SOLVENT EXTRACTION MECHANISM OF Ni++、Co++、Cu++ WITH DI-2-ETHYIHEXYLPHOSPHORIC ACID BY THE TWO-PHASE TITRATION METHOD

Wang Wenqing, Mou Xiru   

  1. Department of Technical Physics, Peking University, Beijing
  • Received:1980-08-20 Online:1981-08-24 Published:1981-08-24

摘要: 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MA2·2HA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1gβGu=11.58;1gβco=10.63:1gβNi=8.97。

Abstract: A Two-phase Titration Method has been used tor the investigation of solvent extraction mechanism of Ni++、 Co++and Cu++with Di-2-ethylhexyl-phosphoric acid. The method is very simple and rapid. In the experiment we only want to determine the variation of pH, and calculate the extraction constant. In the ranee of concentration studied, metal ion (Mi++、 Co++ and Cu++) is extracted into the organic phase by HDEHP-C6 H6 system with the formation of MA2·2HA.

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