高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (7): 589.

• 研究简报 • 上一篇    下一篇

二-(2-乙基已基)膦酸(P229)的基本常数测定

陈金榜, 廖起牧   

  1. 北京大学技术物理系
  • 收稿日期:1986-01-31 出版日期:1987-07-24 发布日期:1987-07-24

Determination of Some Basic Constants of Extractant P229

Chen Jinbang, Liao Qimu   

  1. Department of Technical Physics, Peking Universit, Beijing
  • Received:1986-01-31 Online:1987-07-24 Published:1987-07-24

摘要: 有关P229萃取金属离子的研究,目前文献上还很少报道,为研究P229萃取金属离子的机理,需要知道它的一系列物理化学常数,特别是关于两相体系的基本常数,本文报道了P229在水中的溶解度S、电离常数Ka、在正辛醇-水两相中的两相电离常数Kac及分配常数Kd的测定及计算。

Abstract: In this paper some basic constants of extractant di(2-ethylhexyl)-phosphinic acid (P229) were determined. The solubility (S) of P229 in water was determined by the conductometric and pH methods. The ionization constant (Kα) of P229 in aqueous solution, distribution constant (Kd) and dissociation constant (Kαe) of P229 between octanol-water two phases were determined by two phases titration method. The results are as follows. 5=4.64×10-5mol·dm-3, pKα= 4.58, pKαe= 8.50, lgKd=3.92 (25±0.2℃).

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