Analytical Sciences

Co-extraction of Lanthanoid(III) with Various Metal Ions in the Chelate Extraction System with Acetylacetone

Naohiro KAMETA, Hisanori IMURA, and Kousaburo OHASHI

Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito 310-8512, Japan

The co-extraction phenomenon was found in a typical chelate extraction system, in which the extraction of lanthanoid ion (Ln³⁺) with acetylacetone (Hacac) was highly enhanced by various metal ions (Mⁿ⁺) such as Cu²⁺, Al³⁺, and Zr⁴⁺. This phenomenon was ascribed to the formation of the 1:1 adduct between Ln(acac)₃ and the M(acac)_n extracted into the organic phase. The co-extraction occurred more readily for La³⁺ than that for Lu³⁺, and increased in the order of Cu²⁺ × Al³⁺ < Zr⁴⁺. This work elucidated that the co-extraction due to the adduct formation is a rather common phenomenon in the chelate extraction.

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