Analytical Sciences

Abstract − Analytical Sciences, 20(4), 735 (2004).

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.