Solvent extraction of cadmium by dioleylphosphoric acid

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

    Research output: Contribution to journalArticlepeer-review


    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, Japan
    Issue number4
    Publication statusPublished - 1997

    All Science Journal Classification (ASJC) codes

    • General Chemistry
    • General Chemical Engineering
    • Filtration and Separation


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