title: Extraction capacity of diglycolamide derivatives for Ca(II), Nd(III) and Zr(IV) from nitric acid to N-dodecane containing a solvent modifier.
abstract: In order to evaluate the extraction property of new extractants, diglycolamide (DGA) compounds, we investigated the maximum extraction of di-, tri-, and tetravalent metal ions using nitric acid and n-dodecane. The limits of metal concentration (LOC) for Ca(II), Nd(III) and Zr(IV) in the organic phase are strongly influenced by HNO3 and the extractant concentration. For the purpose of enhancing the LOC value, we employed a modifier of the solvent, N,N-dihexyl-octanamide (DHOA) and DGA with a long alkyl chain, and examined the results. It was evident that LOC increased with the DHOA concentration and the length of the alkyl chain attached to the N atom of DGA. The stoichiometric values of LOC(Zr) estimated from the extraction reaction were confirmed by using the extraction condition: tetraoctyl-DGA/1 M DHOA + n-dodecane and 3 M HNO3.
authors.affiliation: Department of Materials Science, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195, Japan. sasaki@analchem.tokai.jaeri.go.jp
authors.forename: Yuji
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Zhi-Xuan
authors.initials: ZX
authors.lastname: Zhu
authors.forename: Yumi
authors.initials: Y
authors.lastname: Sugo
authors.forename: Hideya
authors.initials: H
authors.lastname: Suzuki
authors.forename: Takaumi
authors.initials: T
authors.lastname: Kimura
mesh_terms: D000473:Alkanes / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry* / Q000378:metabolism; D005591:Chemical Fractionation / Q000379:methods; D006016:Glycolates / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D009354:Neodymium / Q000737:chemistry* / Q000378:metabolism; D017942:Nitric Acid / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000473:Alkanes; D006016:Glycolates; D012997:Solvents; C007548:n-dodecane; D009354:Neodymium; D017942:Nitric Acid; C053956:glycolamide; D015040:Zirconium; D002118:Calcium