Solvent extraction of cadmium by dioleylphosphoric acid

Takahiko Kakoi, Yukiko Tomono, Masahiro Goto, Tokihiro Kago, Fumiyuki Nakashio

Research output: Contribution to journalArticle


The extraction mechanism of cadmium (II) with dioleylphosphoric acid has been investigated in a liquid-liquid extraction system. Dioleylphosphoric acid was found to possess a high extraction potential for cadmium ions. The composition of the complex between a cadmium ion and the extractant was elucidated by slope analysis and by Job's method. The cadmium ion reacts with two dimers of dioleylphosphoric acid in n-dodecane and two protons in the extractant are released to the aqueous phase. The location site of the organometallic complex CdR2•4HR in the organic solvent has been observed by a light scattering method performed on loaded organic solution to exist in the wall of reversed micelles. Further, the back-extraction was easily achieved by contacting the loaded organic phase with hydrochloric acid solution.

Original languageEnglish
Pages (from-to)62-72
Number of pages11
JournalSolvent Extraction Research and Development
Issue number4
Publication statusPublished - Dec 1 1997

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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    Kakoi, T., Tomono, Y., Goto, M., Kago, T., & Nakashio, F. (1997). Solvent extraction of cadmium by dioleylphosphoric acid. Solvent Extraction Research and Development, 1997(4), 62-72.